Does Ashwagandha Affect Body Composition? Research Review

Key Takeaways

Does ashwagandha make you gain weight? Three placebo-controlled trials (n=209 total) show ashwagandha either reduces body weight or improves body composition — never increasing fat mass. Wankhede et al.’s 8-week RCT found KSM-66 plus resistance training significantly increased lean muscle mass while reducing body fat percentage (Wankhede et al., 2015, JISSN). Any scale-weight increase users report is more likely lean tissue gain from ashwagandha’s cortisol-lowering and anabolic benefits, not fat accumulation.

"Does ashwagandha cause weight gain?", or asked another way, "Can ashwagandha cause weight gain?", generates more conflicting answers than almost any other supplement question. Reddit threads warn of bloat. Social media trends label it "nature's Ozempic," which is misleading — ashwagandha is a botanical adaptogen with a different mechanism of action than any prescription weight-loss medication, and is not equivalent to, nor a substitute for, any pharmaceutical drug. A 2025 RCT calls both narratives wrong. Here's what 209 trial participants, not anecdotes, actually show.

What Is Ashwagandha?

Ashwagandha (Withania somnifera) is an adaptogenic herb used in Ayurveda for centuries. Its active withanolides help regulate the stress response, mainly by lowering cortisol. It has no calories and no known fat-storing mechanism, which is why trials show it doesn't cause weight gain and may even curb stress-driven eating.

Ashwagandha (Withania somnifera) is an Ayurvedic adaptogen, a botanical that helps the body buffer physical and psychological stress by modulating the HPA (hypothalamic-pituitary-adrenal) axis, used for 3,000+ years in traditional medicine and now studied in over 25 placebo-controlled human trials.

Research has documented effects well beyond stress relief: better sleep quality, lower anxiety scores in clinical trials, immune-modulating activity, improved athletic performance markers, and modest testosterone increases in men. Ashwagandha is among the most extensively studied herbs in complementary and integrative health research today.

The compounds doing the work are withanolides, bioactive steroidal lactones (a class of plant-derived ring-shaped molecules) found primarily in the root. Clinical-grade extracts are standardized to a specific withanolide percentage: KSM-66 to 5%, Sensoril to 10%, generic extracts typically 0.5–2.5%. The brand and extract type matter more than most people realize.

The weight question is separate from the general benefits question. It needs specific data, not general reputation.

Does ashwagandha make you gain weight?

No — none of the three best placebo-controlled trials show fat gain from ashwagandha. Two show weight loss. One shows muscle gain during strength training, with body fat percentage going down. The phrase "does ashwagandha make you gain weight" returns 5,700 monthly searches and the answer is consistent across the evidence: it doesn't drive fat accumulation.

Pakhale et al., 2025, the strongest evidence to date

According to Dr. Ketan Pakhale at the Metabol-Lifestyle Clinic for Metabolic Syndrome (Mumbai, India) and Dr. Deepak Langade at D Y Patil University School of Medicine (Navi Mumbai, India), 600 mg of KSM-66 ashwagandha daily for 24 weeks produced an average weight loss of 8.46 kg versus 2.41 kg in placebo, with no required diet or exercise changes. The trial enrolled 100 adults aged 19–65 and was published in the Journal of Medicine and Life (Pakhale et al., 2025).

BMI dropped 3.31 units in the ashwagandha group versus 0.93 in placebo. Cortisol, ACTH, and CRH all declined while serotonin and BDNF rose. Food cravings decreased significantly. This was the longest weight-focused ashwagandha trial published — 24 weeks instead of the usual 8.

Choudhary et al., 2017, independent replication of weight loss

A double-blind, placebo-controlled study of 52 adults under chronic stress over 8 weeks. According to lead researcher Dr. Dnyanraj Choudhary at the Indian Red Cross Society in Pune, India, the ashwagandha group showed significant improvement in body weight, BMI, serum cortisol, and food cravings versus placebo, with an average ~3% reduction in body weight (Choudhary et al., 2017). The trial used KSM-66 ashwagandha at 300 mg twice daily over 8 weeks in chronically stressed adults with BMI 25–39.9.

Wankhede et al., 2015 — where the "weight gain" confusion starts

Here's the trial that fuels the "ashwagandha made me gain weight" Reddit posts. According to Dr. Sachin Wankhede's team, men doing 8 weeks of resistance training with 600 mg KSM-66 daily gained significantly more lean muscle mass and muscle strength than placebo (Wankhede et al., 2015), published in the Journal of the International Society of Sports Nutrition.

Scale weight in the treatment group did go up. Body fat percentage went down. That's the opposite of fat gain, it's body recomposition. If you're lifting weights and taking ashwagandha, this is the outcome you want.

What do the 3 trials show side by side?

All three trials were double-blind, placebo-controlled. Fat gain was not observed at 600 mg daily in any of them.

Why do some people think ashwagandha causes weight gain?

The perception usually traces to four things, none of them fat gain from the herb. Better sleep and appetite can raise intake, water shifts move the scale, the supplement often coincides with other diet changes, and stress relief alters eating patterns. Ashwagandha itself has no caloric content or fat-storing action.

The "weight gain" perception usually has four explanations, and none of them mean ashwagandha is putting fat on you. The herb itself has no caloric content and no mechanism for fat storage, but it changes appetite, sleep, recovery, and muscle, all of which can shift the scale.

1. Cortisol normalization restoring appetite. Chronically elevated cortisol can suppress appetite in some people, the body shuts down digestion when it thinks you're being chased by a lion. When research suggests ashwagandha lowers cortisol, that appetite returns to baseline, and it can feel like a sudden hunger increase. You're not gaining fat from the herb, you're eating again after stress had shut you down.

2. Better sleep = better recovery = more muscle. Ashwagandha's sleep-quality improvement (multiple RCTs) means your body actually repairs the tissue you damage during the day. For anyone training, that shows up as lean mass gains over weeks. Your jeans get tighter in the thighs, not the waist.

3. Thyroid hormone effects. Some studies suggest ashwagandha may mildly increase thyroid hormones, particularly T4, which is usually a metabolism boost, not a slowdown. Anyone with diagnosed thyroid disease should discuss this with their doctor before starting.

4. Confounders. People start ashwagandha during life transitions, new jobs, sedentary work, dietary changes, new relationships. Attributing weight changes to one supplement without controlling diet and activity is unreliable. This is why placebo-controlled trials matter more than self-reported anecdotes.

How does the cortisol-weight connection work?

The mechanism that explains ashwagandha's relationship with body weight is cortisol modulation. Chronic stress drives sustained cortisol elevation, and sustained cortisol drives visceral fat storage, sugar cravings, reduced insulin sensitivity, and disrupted sleep, which compounds the problem.

According to Dr. Andrew Huberman, professor of neurobiology and ophthalmology at Stanford School of Medicine, six quality human studies on ashwagandha show "very significant, you know, 14.5 to 27.9% reductions" in cortisol in otherwise healthy but stressed adults, a reduction he describes as "significantly larger than many other supplements" on the Huberman Lab podcast (Episode 18: Using Cortisol and Adrenaline).

Huberman himself uses ashwagandha situationally: "If I'm having a particularly stressful day or a particularly long bout of stress, I'll take some ashwagandha late in the day. There's good evidence that can buffer cortisol. I do cycle it", typically taking a week, then breaking.

That cycling protocol matters. Ashwagandha's effects build over weeks (the Pakhale trial showed progressive results through 24 weeks), but most clinicians recommend periodic breaks rather than indefinite daily use. According to Dr. Mark Hyman, functional medicine practitioner and founder of The UltraWellness Center, ashwagandha works best as part of a broader stress-management protocol rather than a single fix.

The body of evidence for cortisol reduction was reinforced in 2025 by a systematic review and meta-analysis of 15 RCTs (873 adults) led by Dr. George Bachour at Tishreen University, published in BJPsych Open: cortisol levels dropped by μ = −2.36 µg/dL (95% CI: −3.26 to −1.46, p<0.0001) at 8 weeks (Bachour et al., 2025).

For a deeper dive: Ashwagandha and Cortisol: The Science Behind Stress Relief and Cortisol and Sleep.

When won't ashwagandha help with weight?

Ashwagandha is not a weight-loss drug, and pretending it is sets people up for disappointment. The trials that showed weight loss all involved either chronically stressed populations or overweight participants, groups whose cortisol was elevated to begin with. If your cortisol is normal, the weight signal will be weaker or absent.

A 2025 systematic review by Dr. Ahmad Abdualrazag Albalawi at the University of Tabuk found something honest: while ashwagandha significantly reduced cortisol (−1.16 µg/dL across seven trials, n=488 combined participants), it did not significantly improve Perceived Stress Scale scores in some populations (Albalawi et al., 2025). Lower lab-measured cortisol doesn't always translate to subjectively feeling less stressed, and that means the appetite/cravings benefit isn't guaranteed.

The honest version: if your weight problem is purely caloric (eating more than you burn, with normal cortisol and good sleep), ashwagandha is unlikely to move the needle. If it's stress-driven, late-night eating, cortisol belly, can't-sleep-can't-stop-snacking, then the evidence is much stronger.

What about maca root and ashwagandha together for weight?

Maca and ashwagandha are frequently stacked, so it's worth clarifying what the combination does and doesn't do for body weight. Neither herb is a weight-gain or weight-loss agent on its own. Ashwagandha works primarily through cortisol modulation; maca is an energy-and-libido adaptogen with no established effect on fat mass in controlled trials. Stacking them does not create a weight-changing effect that neither has individually.

Where the combination can matter indirectly: if lower stress (ashwagandha) and steadier energy (maca) improve your sleep, training consistency, and appetite regulation, body composition may shift as a downstream result of those behavior changes — not from the herbs acting on fat cells. If you see scale weight rise on this stack, the most likely explanations are the same ones covered above: better-quality training driving lean-mass gain, or improved appetite restoring intake after a stressed, under-eating period. Track waist circumference and how clothes fit, not just the scale number, to tell muscle from fat.

What are ashwagandha's other benefits?

Ashwagandha is rarely taken just for weight — it's a multi-target adaptogen, and the weight effect is usually secondary to stress, sleep, and recovery benefits.

Anxiety and stress. The largest meta-analysis to date (Bachour et al., 2025) found ashwagandha significantly reduced anxiety on the Hamilton Anxiety Rating Scale at 8 weeks (μ = −3.52, p = 0.0053) and Perceived Stress Scale scores (μ = −4.88, p = 0.0013).

Sleep. A 2021 systematic review and meta-analysis by Dr. Kae Ling Cheah and colleagues at Universiti Sains Malaysia pooled five RCTs (n=400) and found ashwagandha had a small but statistically significant effect on combined sleep (Standardized Mean Difference −0.59, 95% CI −0.75 to −0.42). Effects were stronger at doses ≥600 mg/day and durations ≥8 weeks (Cheah et al., 2021).

Broader mental wellness. A 2025 systematic review by Dr. Mattia Marchi and colleagues at the University of Modena (BJPsych Open) examined ashwagandha's effect on mental health symptoms across clinical populations and found generally favorable tolerability and benefit signals (Marchi et al., 2025).

Testosterone and performance in men. Wankhede 2015 found significant testosterone increases alongside the muscle gains (placebo: +18.0 ng/dL; ashwagandha: +96.2 ng/dL, p = 0.004). A separate 2015 trial by Bakhtiar Choudhary and colleagues (n=49 healthy athletic adults) reported a 13.6% increase in VO2 max with 600 mg KSM-66 daily over 12 weeks versus 4.4% placebo (Choudhary et al., 2015). See: Ashwagandha for Men.

For the full list: Ashwagandha Benefits.

How should you take ashwagandha for weight concerns?

If weight is a concern, use ashwagandha for its stress and cortisol benefits, not as a weight-loss product. Take 300 to 600 mg of KSM-66 daily and pair it with normal diet and activity. In trials it didn't add fat; the Pakhale (2025) study even showed weight loss versus placebo.

Match the dose and form used in the trials that worked: 600 mg of standardized KSM-66 root extract daily, ideally split into two 300 mg doses, for at least 8 weeks.

Form matters: Ashwagandha extract standardized to withanolides (5% for KSM-66, 10% for Sensoril) outperforms raw powder by a wide margin. Our Ashwagandha Plus (KSM-66) delivers 600 mg per serving, matching the Pakhale and Wankhede protocols exactly.

Stacking: Pairs well with Magnesium Glycinate for evening cortisol management and Berberine for metabolic support. See: Ashwagandha and Magnesium Glycinate Together.

How do KSM-66, Sensoril, and generic ashwagandha compare?

The clinical trials almost universally used KSM-66 (root-only, 5% withanolides) or Sensoril (root + leaf, 10% withanolides). Generic ashwagandha extracts typically contain 0.5–2.5% withanolides and have no specific trial data.

The practical upshot: pay for the standardization. A 600 mg KSM-66 capsule and a 600 mg generic ashwagandha capsule cost roughly the same, but you can't read the trial data and apply it to the generic version.

For the full extract comparison: KSM-66 vs. Regular Ashwagandha Extract.

Who Should Be Cautious With Ashwagandha

Ashwagandha is generally well tolerated, but several groups should consult a healthcare provider first, pregnancy, thyroid conditions, autoimmune conditions, scheduled surgery, or use of sedatives, blood thinners, or blood-sugar–lowering medications.

• Pregnancy and breastfeeding: Avoid. Animal studies show abortifacient effects; no human safety data.
• Thyroid conditions: Ashwagandha may modestly increase thyroid hormones. People with diagnosed thyroid conditions should discuss with a doctor before starting.
• Autoimmune conditions: Ashwagandha has immune-modulating effects. People managing autoimmune conditions should consult their physician before use.
• Liver concerns: Rare case reports of drug-induced liver injury exist, especially at very high doses (>1,000 mg/day) or with poor-quality extracts. Symptoms include jaundice, dark urine, or right-upper-quadrant pain — discontinue immediately and see a doctor.
• Medications: May interact with sedatives, immunosuppressants, thyroid medication, and blood-sugar–lowering medications. Always disclose all supplements to your prescribing healthcare provider.
• Surgery: Stop 2 weeks before scheduled surgery due to sedative effects.

For the full safety breakdown: Ashwagandha Side Effects and comparison with other adaptogen safety profiles.

Why YourHealthier Recommends KSM-66 Specifically

We sell KSM-66, not generic ashwagandha, for one reason: it's the extract used in the trials we cite. Pakhale 2025, Wankhede 2015, Choudhary 2017, the Langade sleep trials, and the Chandrasekhar cortisol study all used either KSM-66 or comparable standardized root extracts at 300–600 mg per day. When you read a study showing 8.46 kg of weight loss, the extract on the page should be the extract in the bottle.

Our Ashwagandha Plus formulation delivers 600 mg of KSM-66 per serving with added black pepper extract for absorption, the same protocol used in the strongest weight-related trial published to date. We don't pad the bottle with leaf extract, mycelium, or "proprietary blends" that mask the actual dose. If a competitor's label says "ashwagandha root extract 1,500 mg" without specifying KSM-66 or Sensoril and withanolide percentage, the data doesn't apply.

What's the verdict on ashwagandha and weight?

Does ashwagandha cause weight gain? Across 209 trial participants in three placebo-controlled studies, no. Two showed loss of body weight and body fat. The third showed muscle gain during strength training with body fat percentage decreasing. The "does ashwagandha make you gain weight" question almost always traces back to appetite normalization after stress had suppressed it, or to muscle gain mistaken for fat gain.

Ashwagandha isn't a weight-loss drug. It's a cortisol modulator that removes a hormonal barrier to losing fat, particularly visceral, stress-driven fat. Paired with reasonable food and movement, the data is strong. Used in isolation without lifestyle context, results are more variable but still favor reduction over gain.

Related Research

• PubMed: 28207892
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• PubMed: 28829155
• PubMed: 31991029
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Related Reading

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What Does Ashwagandha Actually Do to Body Composition?

The relationship between ashwagandha and body weight runs through cortisol, not through appetite or metabolism directly. Chronically elevated cortisol promotes visceral fat storage, increases cravings for calorie-dense foods, and disrupts sleep — all of which compound into gradual weight gain over months. By reducing cortisol (the Chandrasekhar 2012 RCT measured a 27.9% drop over 60 days), ashwagandha may remove one of the upstream drivers of stress-related weight gain.

The Choudhary 2017 trial measured body weight as a secondary endpoint and found no significant weight change in either direction over 8 weeks at 600 mg/day. The Wankhede 2015 study in resistance-trained men actually found decreased body fat percentage in the ashwagandha group compared to placebo, likely because the cortisol reduction improved recovery and allowed more productive training adaptations. If you are wondering what ashwagandha does beyond stress, the benefits for men and benefits for women guides cover the gender-specific data.

The water retention question deserves a direct answer. Unlike creatine, which increases intracellular water content through osmotic mechanisms, ashwagandha does not have a documented effect on water balance. The rare reports of "puffiness" on ashwagandha forums are more likely related to dietary changes, hormonal fluctuation, or the simple psychological tendency to scrutinize your body more closely when you start a new supplement. If you experience genuine bloating or GI discomfort, see our ashwagandha side effects guide and consider switching to taking it with food, which eliminates stomach-related complaints for most people.

What to monitor if you are tracking body composition on ashwagandha

If you are concerned about weight changes while taking ashwagandha, the scale alone is an unreliable metric. Body weight fluctuates by 1 to 3 kg daily based on hydration, sodium intake, glycogen storage, and bowel timing. A more informative approach is tracking three measurements over 4 to 8 weeks: waist circumference (the most reliable proxy for visceral fat change), a front-facing photo under consistent lighting (visual assessment catches changes that scales miss), and morning fasted weight averaged over 7-day rolling windows rather than daily readings.

The Wankhede 2015 trial that combined KSM-66 with resistance training illustrates why body composition metrics outperform scale weight. The ashwagandha group gained lean mass and lost body fat simultaneously, resulting in minimal net weight change despite meaningful body composition improvement. If that study had reported only scale weight, the beneficial effect would have been invisible. For the full breakdown of what these body composition changes mean in practice, see ashwagandha for men and ashwagandha for women.

One frequently overlooked factor in the weight conversation: ashwagandha may improve sleep quality (Langade 2019), and better sleep independently reduces appetite-regulating hormone dysregulation (elevated ghrelin, suppressed leptin) that drives weight gain. If chronic stress is disrupting your sleep and your sleep disruption is driving overeating, ashwagandha may address weight gain indirectly through this upstream pathway rather than through any direct metabolic mechanism.

For clarity: ashwagandha does not contain calories in any meaningful amount. A 600 mg KSM-66 capsule adds approximately 2 to 3 calories to your daily intake. There is no thermogenic or metabolism-suppressing effect documented in any clinical trial. The only pathway through which ashwagandha could theoretically contribute to weight gain is through improved appetite in severely stressed individuals whose appetite had been suppressed by chronic cortisol elevation. If your stress has been killing your appetite and ashwagandha normalizes your cortisol, you may find yourself eating normally again, which could register as weight gain relative to your stress-suppressed baseline. This is appetite normalization, not a side effect.

The upshot: ashwagandha is weight-neutral in clinical data, with a slight trend toward improved body composition (less fat, more lean mass) in studies that combined supplementation with exercise.

Context: does ashwagandha work for body composition? The Wankhede 2015 trial showed improved lean mass and reduced body fat in the ashwagandha group versus placebo during resistance training. The mechanism is cortisol reduction enabling better recovery, not direct metabolic stimulation.

Does Ashwagandha Lower Blood Pressure?

Evidence points to a modest lowering effect, mainly in people whose blood pressure runs high from stress. A randomized, double-blind, placebo-controlled trial in healthy adults found ashwagandha root extract reduced anxiety and serum cortisol versus placebo.

That trial (Salve et al., 2019, PMID: 32021735) fits the cortisol story this article has been building: when stress hormones drop, stress-driven blood pressure tends to follow. Two things keep us honest here. The effect is modest — this is not a hypertension treatment, and nobody should swap prescribed medication for a root extract. And if you already take blood pressure medication, the directions can stack; clear it with your physician first. The 600 mg KSM-66 dose in our Ashwagandha Plus sits in the range these trials actually studied, which is exactly why we didn't dose higher.

Does Ashwagandha Raise Blood Pressure?

No; the clinical data shows the opposite or no change. Across randomized controlled trials monitoring vital signs, ashwagandha either left blood pressure unchanged in healthy adults or modestly lowered it in stressed and prehypertensive groups. No controlled trial has shown it raising blood pressure.

The worry usually comes from ashwagandha's "energizing" reputation, as if it worked like caffeine. It doesn't. It has no stimulant action, and the comprehensive pharmacology review of Withania somnifera documents its profile as the reverse: calming, cortisol-moderating (Mandlik & Namdeo, 2021, PMID: 32242751). Worth separating from our formula specifically: Ashwagandha Plus also carries ginseng, which a small number of people find mildly stimulating. If you're sensitive and monitoring blood pressure, take it in the morning and check readings the way you already do.

Does Ashwagandha Show Up on a Drug Test?

No. Standard workplace drug panels test for substances like opioids, amphetamines, THC, cocaine, and PCP. Ashwagandha's active compounds — withanolides — aren't on any standard panel and don't cross-react with the immunoassays those tests use.

Ashwagandha is a legal dietary supplement in the US, and it isn't on the World Anti-Doping Agency prohibited list either, which matters for tested athletes. The real limitation applies to supplement quality, not the herb: a poorly made product could theoretically contain contaminants, which is a manufacturing problem rather than an ashwagandha problem. It's why we use the branded KSM-66 extract, standardized to 5% withanolides, with US manufacturing; the input is traceable. If your sport or job has strict testing, supplements with third-party certification are the conservative route.

Can Ashwagandha Cause Constipation?

It's uncommon. When ashwagandha causes digestive complaints, trials more often report mild nausea, loose stools, or stomach upset — usually at higher doses or on an empty stomach. Constipation shows up rarely in the clinical literature, and switching to taking it with food resolves most GI issues.

The safety data across trials describes ashwagandha as generally well tolerated at studied doses, with GI complaints being mild and transient when they occur (Mandlik & Namdeo, 2021, PMID: 32242751). If you do get backed up after starting it, look at what changed alongside: new supplements often arrive with less water, more protein, or other routine shifts. Take it with a meal and a full glass of water for a week. Persistent constipation that doesn't respond is worth a conversation with your doctor, and not something to push through. Timing strategies are in when to take ashwagandha.

Can Ashwagandha Cause Weight Loss?

Some evidence points in that direction, mainly through cortisol reduction. A 2017 double-blind RCT found that adults under chronic stress who took 300 mg of ashwagandha root extract twice daily for 8 weeks experienced significant reductions in perceived stress, serum cortisol, and body weight compared to placebo (Choudhary et al., 2017). The weight loss was modest (about 3 percent of body weight) and likely driven by reduced stress-related eating rather than a direct metabolic effect.

Can Ashwagandha Cause Weight Gain?

Ashwagandha itself is not caloric enough to cause fat gain at standard doses of 300 to 600 mg/day. In resistance-trained populations, studies show increases in lean body mass of 1 to 2 kg over 8 weeks (Wankhede et al., 2015), which can register as scale weight going up. If cortisol drops and appetite recovers in a previously stressed individual, caloric intake may rise enough to produce a small surplus. The direction of weight change depends on baseline stress level and training status.

Frequently Asked Questions

Our Batch-Level Purity Testing

Manufactured in a UL Solutions GMP-certified facility (Retail Certification Program Requirements, certification valid through November 12, 2028). Every batch of Ashwagandha Plus undergoes independent third-party testing at a cGMP-compliant third-party laboratory for heavy metals and microbial contamination. Lot 5100117 (COA issued 01/16/2026) passed every safety threshold.

Testing performed using validated analytical methods per cGMP requirements. The data below reflects batch-specific results — not general ingredient claims — verified under current Good Manufacturing Practices (21 CFR Part 111).

Testing performed by cGMP-compliant third-party laboratory. Serving size: 2 Capsules. Manufacturing date: 10/15/2025. Full batch results: yourhealthier.com/pages/lab-results. Original certificates of analysis available upon request.

Authoritative Resources

For independent, government-reviewed information on this ingredient, consult these primary sources:

• NCCIH — Ashwagandha

Testing & Transparency Methodology

Every YourHealthier product referenced here is manufactured in an FDA-registered facility and undergoes independent third-party testing at accredited laboratories (ISO/IEC 17025, A2LA, or Eurofins, depending on the product). Each batch is screened for heavy metals (lead, cadmium, mercury, arsenic) and microbial contamination (total plate count, yeast, mold, E. coli, Salmonella) using validated USP, AOAC, and ICP-MS methods. Batch-specific certificates of analysis are published at yourhealthier.com/pages/lab-results and updated with each new manufacturing run. All testing complies with current Good Manufacturing Practices (21 CFR Part 111). This article is written for general educational purposes and is not medical advice; it has not been evaluated by the FDA and is not intended to diagnose, treat, cure, or prevent any disease.

References

1. Pakhale K, Pakhale R, Srivathsan M, Langade J, Langade D. (2025). "Efficacy and safety of Ashwagandha (Withania somnifera) root extract on stress and weight management in adults: a prospective, randomized, double-blind, placebo-controlled study." Journal of Medicine and Life, 18(12), 1140–1154. PMID: 41635453. PMC
2. Wankhede S, Langade D, Joshi K, Sinha SR, Bhattacharyya S. (2015). "Examining the effect of Withania somnifera supplementation on muscle strength and recovery: a randomized controlled trial." Journal of the International Society of Sports Nutrition, 12, 43. PMID: 26609282. PubMed
3. Chandrasekhar K, Kapoor J, Anishetty S. (2012). "A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of ashwagandha root in reducing stress and anxiety in adults." Indian Journal of Psychological Medicine, 34(3), 255–262. PMID: 23439798. PubMed
4. Bachour G, Samir A, Haddad S, Houssaini MA, El Radad M. (2025). "Effects of Ashwagandha Supplements on Cortisol, Stress, and Anxiety Levels in Adults: A Systematic Review and Meta-Analysis." BJPsych Open, 11(S1), S39. DOI: 10.1192/bjo.2025.10136. PMC
5. Marchi M, Grenzi P, Travascio A, et al. (2025). "The effect of Withania somnifera (Ashwagandha) on mental health symptoms in individuals with mental disorders: systematic review and meta-analysis." BJPsych Open, 11(6), e260. PMID: 41140145. PubMed
6. Cheah KL, Norhayati MN, Husniati Yaacob L, Abdul Rahman R. (2021). "Effect of Ashwagandha (Withania somnifera) extract on sleep: A systematic review and meta-analysis." PLoS ONE, 16(9), e0257843. PMID: 34559859. PubMed
7. Choudhary B, Shetty A, Langade DG. (2015). "Efficacy of Ashwagandha (Withania somnifera [L.] Dunal) in improving cardiorespiratory endurance in healthy athletic adults." AYU, 36(1), 63–68. PMID: 26730141. (Note: This is a distinct study from Dnyanraj Choudhary, 2017 weight management trial.) PubMed
8. Albalawi AA. (2025). "Dual impact of Ashwagandha: Significant cortisol reduction but no effects on perceived stress — A systematic review and meta-analysis." Nutrition and Health, 31(4), 1395–1408. PMID: 40746175. PubMed
9. Langade D, Kanchi S, Salve J, Debnath K, Ambegaokar D. (2019). "Efficacy and Safety of Ashwagandha (Withania somnifera) Root Extract in Insomnia and Anxiety: A Double-blind, Randomized, Placebo-Controlled Study." Cureus, 11(9), e5797. PMID: 31728244. PubMed
10. Huberman A. (2021). "Using Cortisol and Adrenaline to Boost Our Energy and Immune System Function." Huberman Lab Podcast, Episode 18. Huberman Lab

Disclosure: YourHealthier sells ashwagandha supplements. All claims based on published peer-reviewed research and direct citations from named experts. Statements about specific brand products (KSM-66, Sensoril, Nutricost, Pure Encapsulations, NOW Foods, Nature Made) are factual references to publicly available product labels and clinical trial extracts and do not constitute endorsement by those brands. See Editorial Policy.

Does Ashwagandha Affect Birth Control?

No published study has directly tested ashwagandha against hormonal contraceptives. However, it does influence the endocrine system—modulating cortisol, thyroid, and mildly affecting reproductive hormones. Theoretically, any herb affecting hormone metabolism could interact with hormone-based birth control. No reduced effectiveness has been documented, but absence of evidence isn't proof of safety. Tell your gynecologist so they can monitor for menstrual changes.

Can Ashwagandha Cause Heart Palpitations?

Heart palpitations are an uncommon but documented side effect, likely from ashwagandha's thyroid-stimulating properties—it can raise T3 and T4 levels (PMID: 28829155), increasing heart rate. Risk is higher with pre-existing hyperthyroidism or Hashimoto's disease. If you experience palpitations after starting ashwagandha, discontinue use and have your thyroid checked by a physician.

Does Ashwagandha Lower Heart Rate?

Ashwagandha may modestly reduce resting heart rate through its calming effect on the autonomic nervous system. By lowering cortisol and activating GABA pathways, it shifts the body from sympathetic toward parasympathetic dominance. A 2012 study (PMID: 23439798) noted improvements in stress-related cardiovascular markers. The effect is mild—not comparable to beta-blockers—and most noticeable in people with stress-elevated heart rates.

Does Ashwagandha Interfere with Any Medications?

Yes. Ashwagandha can interact with several medication categories: thyroid medications (it stimulates T3/T4 production, potentially destabilizing levothyroxine dosing), immunosuppressants (ashwagandha may stimulate immune activity), sedatives and benzodiazepines (additive drowsiness through GABA modulation), and blood sugar medications (ashwagandha may lower glucose, increasing hypoglycemia risk). If you take any prescription medication, discuss ashwagandha with your prescribing physician before supplementing.

This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not intended as medical advice.

Ashwagandha & Weight: Trial Data

Metric	Value
Placebo-controlled RCTs	n = 209
Trials showing fat gain	0 of 3
Body fat trend	decreased
Lean mass trend	increased
Pakhale 2025 (24 wk)	weight loss
Source: YourHealthier · Pakhale 2025; Choudhary 2017; Wankhede 2015

Chart: Ashwagandha & Weight: Trial Data. Data: Placebo-controlled RCTs: n = 209; Trials showing fat gain: 0 of 3; Body fat trend: decreased; Lean mass trend: increased; Pakhale 2025 (24 wk): weight loss. Source: Pakhale 2025; Choudhary 2017; Wankhede 2015.