8 Best Supplements for Anxiety in 2026 (Evidence-Based, Ranked)

Key Takeaways

We graded eight supplements A through C by how many randomized controlled trials support them, whether a meta-analysis exists, and how consistent the findings are. Three reached Grade A: ashwagandha (a 2026 dose-response meta-analysis of 22 RCTs plus a 2025 meta-analysis of 15 trials), L-theanine (a 2026 meta-analysis of 31 trials in Molecular Psychiatry), and magnesium (a 2024 systematic review of 15 trials, strongest in people low in magnesium). Omega-3 earned B+ (a 23-trial meta-analysis found benefit around 2 g/day, though the certainty was rated low). Kava, valerian, oral GABA, St. John's Wort, and CBD were reviewed and left off — we explain why below. Every claim links to its source on PubMed.

These statements have 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 educational and is not medical advice. Anxiety can be a medical condition; talk to a licensed healthcare provider before starting any supplement, especially if you take prescription medication or have a diagnosed condition.

If you deal with persistent worry, racing thoughts, or that low-grade hum of tension that never quite lets up, you are far from alone. Tens of millions of American adults report ongoing anxiety, and many of them are looking for options beyond prescriptions. A growing body of clinical research — including several meta-analyses published in 2024, 2025, and 2026 — suggests that certain dietary supplements can help the body manage stress and support a calmer baseline when used sensibly.

I run a supplement company, and I want to be straight with you about that up front. We sell ashwagandha, and it is on this list. I am telling you now because most "best supplements for anxiety" articles are written by someone with an undisclosed financial stake. Here you know where mine sits. Even so, everything below earned its ranking from published human data, not from what we happen to stock — and where the evidence is thin, I say so plainly.

Evidence Grading System

Each supplement carries an evidence grade based on three things: how many randomized controlled trials tested it in humans, whether a meta-analysis or systematic review exists, and how consistent the results were across studies. It is a transparent framework, not a black box, and you can check every source yourself.

Grade	What It Means
A	Multiple RCTs plus at least one meta-analysis showing a statistically significant effect, with consistent results across different groups of people.
B	Several RCTs with positive results, but no meta-analysis, mixed findings, or evidence limited to a narrow population.
C	Early evidence from a few trials. Reasonable mechanism and good safety data, but not enough replication for a confident recommendation.

Best Supplements for Anxiety at a Glance

Rank	Supplement	Evidence Grade	Best For	Typical Dose Studied	Onset
1	Ashwagandha	A	Chronic, stress-driven tension	300–600 mg/day	4–8 weeks
2	L-Theanine	A	Situational nerves, focus under pressure	200–400 mg/day	30–60 min
3	Magnesium	A	Low magnesium status, restless sleep	200–400 mg elemental/day	1–4 weeks
4	Omega-3 (EPA/DHA)	B+	Stress with inflammation or low mood	1–2 g/day (≥60% EPA)	8–12 weeks
5	Passionflower	B	Occasional, pre-event nerves	500–1,000 mg/day	30 min–2 weeks
6	Rhodiola rosea	B	Burnout and fatigue-linked tension	200–400 mg/day	1–4 weeks
7	Chamomile	B	Gentle, long-term daily support	500–1,500 mg extract/day	2–8 weeks
8	Vitamin D	C+	Low mood tied to deficiency	2,000–5,000 IU/day	8–12 weeks

Stanford neuroscientist Dr. Andrew Huberman on evidence-based supplements for stress, including ashwagandha and L-theanine.

1. Ashwagandha (Withania somnifera) — Evidence Grade A

Ashwagandha is the most evidence-backed option here (Grade A): a 2026 meta-analysis of 22 randomized trials found it significantly lowered stress, anxiety, and cortisol versus placebo, with effects building over four to eight weeks.

Ashwagandha has the deepest evidence base of any single botanical studied for stress and anxiety, and the data grew stronger in 2026. Our rundown of what ashwagandha does covers the wider benefit picture.

A dose-response meta-analysis in Complementary Therapies in Medicine pooled 22 randomized controlled trials covering 1,391 adults and found that ashwagandha significantly reduced stress, anxiety, and depression scores versus placebo. It also mapped a dose-response curve, with lower doses (≤500 mg/day) and courses longer than eight weeks producing the greatest benefit (Alsanie et al., 2026, Complement Ther Med). A separate 2025 systematic review and meta-analysis in BJPsych Open, covering 15 trials and 873 participants, likewise found a significant reduction in anxiety on the Hamilton Anxiety Rating Scale compared with placebo (Bachour et al., 2025, BJPsych Open). And a 2026 three-arm RCT in stressed adults reported significantly lower anxiety-scale scores with a standardized root extract versus placebo over eight weeks (West et al., 2026, J Med Life).

What sets ashwagandha apart is where it works. Rather than acting only on the feeling of tension, it targets the hormonal system that produces the stress response. Its active compounds, a group of steroidal lactones called withanolides, calm overactivity in the hypothalamic-pituitary-adrenal (HPA) axis, and cortisol tends to fall as a result. There is some secondary effect on GABA and serotonin signaling, but the cortisol pathway is the headline.

That tells you who tends to benefit most. When stress has been building for months, and you feel wired but drained with an eroding tolerance for pressure, ashwagandha speaks to the physiology behind that pattern. It is not the right tool for a flight in two hours or a presentation this afternoon, because it works over four to eight weeks rather than minutes. For that, reach for L-theanine.

Dosage details

Most positive trials used standardized root extract (often KSM-66 or Sensoril) at 300–600 mg per day, standardized to at least 5% withanolides, and the 2026 dose-response data suggests the lower half of that range over a longer course is a sensible target. Our PharmD reviewer's note: the extract type matters more than people assume. Full-spectrum root extracts carry the clinical data; products made from leaves, or that never state their withanolide content, are not interchangeable. Splitting the dose morning and evening is common and reasonable; our ashwagandha dosage guide breaks it down by goal.

Who should be cautious

People with an overactive thyroid or on levothyroxine, since ashwagandha can raise thyroid hormone output. Anyone pregnant or nursing. People on immunosuppressants, as it may stimulate immune activity. Denmark issued a precautionary advisory in 2024 about long-term thyroid effects, worth knowing even though standard-dose trial data has not confirmed a serious risk. And if you take a prescription for anxiety or depression, do not change or stop it to try ashwagandha — that is a conversation for your prescriber, not a solo decision.

2. L-Theanine — Evidence Grade A

L-theanine is the fastest-acting option (Grade A): a single 200 mg dose eases nerves within 30 to 60 minutes without causing drowsiness, supported by a 2026 meta-analysis of 31 trials.

Where ashwagandha builds slowly, L-theanine acts fast.

A 2026 meta-analysis in Molecular Psychiatry, one of the highest-impact journals in the field, pooled 31 randomized controlled trials across 1,168 participants. A single 200 mg dose taken 30 to 60 minutes before a cognitive test significantly improved attention and processing speed (SMD = 0.51), and the authors flagged a possible antidepressant signal worth confirming (Gerolymos et al., 2026, Mol Psychiatry). An earlier systematic review of 11 RCTs covering more than 800 people with diagnosed mental health conditions found that L-theanine reduced psychiatric symptoms more than control conditions, including in generalized anxiety (Moshfeghinia et al., 2024, BMC Psychiatry).

The interesting part of L-theanine is what it avoids. It does not sedate, blunt memory, or slow reaction time. It nudges the brain toward alpha-wave activity, the pattern linked to relaxed focus, while modulating glutamate and GABA. People describe the result as calm alertness: settled, but sharp. In a category where most effective options either put you to sleep or dull your thinking, that combination is unusual and useful, which is also why it appears in our best nootropics guide.

This is what I would keep in my bag for a job interview, a hard conversation, or a long flight. Two hundred milligrams, about 45 minutes ahead.

Dosage

200 mg for occasional use. 200–400 mg per day for ongoing support, with some clinical studies using 400 mg. The safety margin is wide; the 2026 meta-analysis found no difference in dropouts or adverse events versus placebo. If you take blood pressure medication, keep an eye on your readings, since L-theanine may lower blood pressure slightly in some people.

3. Magnesium — Evidence Grade A

Magnesium supports a calmer baseline (Grade A), most clearly when your levels are low; a 2024 review of 15 studies found it improved anxiety and sleep, with glycinate the best-tolerated form.

The one many people are quietly missing

Roughly half of U.S. adults fall short of the recommended intake of magnesium, based on national survey data (here are the common signs of magnesium deficiency). That matters because magnesium is a cofactor in more than 300 enzymatic reactions, several of which govern neurotransmitter balance and the stress axis. When magnesium runs low, the nervous system gets more excitable at the cellular level, and the threshold for a tense response drops.

A 2024 systematic review of 15 studies found that magnesium supplementation improved self-reported anxiety and sleep quality, with the clearest signal in people who were low in magnesium to begin with (Rawji et al., 2024, Cureus). An earlier systematic review in Nutrients reached a similar, if cautious, conclusion across mildly anxious and PMS-related groups (Boyle et al., 2017, Nutrients).

The practical point is simple. If you eat a lot of processed food, drink regularly, train hard, or run on chronic stress, all of which drain magnesium, there is a real chance you are not getting enough. In that case, correcting the deficiency comes first, because no adaptogen fully compensates for a missing building block — the wider benefits of magnesium go well beyond calm.

Which form for a calmer baseline

Magnesium glycinate has the best case here. The glycine it is bound to is itself a calming amino acid, so you get a dual benefit, and it is the gentlest form on digestion. Magnesium L-threonate is the one form shown to cross the blood-brain barrier well (we compare them in glycinate vs threonate); a 2024 randomized, placebo-controlled trial found it improved sleep quality and daytime functioning in adults with self-reported sleep problems (Hausenblas et al., 2024, Sleep Med X). Skip magnesium oxide for this purpose; its absorption sits around 4%, so the large label number is misleading.

Dosage

200–400 mg of elemental magnesium in the evening; our best magnesium picks flag tested glycinate options. Start low and build over a week. The NIH tolerable upper limit for supplemental magnesium is 350 mg/day, though clinicians sometimes go higher with supervision.

Safety

Loose stools at higher doses, more so with citrate and oxide. If you have kidney disease, check with your physician first, since reduced clearance lets magnesium build up.

4. Omega-3 Fatty Acids (EPA and DHA) — Evidence Grade B+

Omega-3 fatty acids (Grade B+) may ease tension at about 2 g/day of mainly EPA over 8 to 12 weeks, per a 2024 meta-analysis of 23 trials, and fit best when inflammation or low mood is also present.

The omega-3 evidence is broad rather than airtight, and the scale is worth respecting.

A 2024 dose-response meta-analysis of 23 randomized trials across 2,189 participants found that each additional gram per day of omega-3 produced a moderate drop in anxiety symptoms (SMD −0.70), with the largest effect near 2 grams per day (Bafkar et al., 2024, BMC Psychiatry). The effect size was meaningful, but the confidence interval was wide and the GRADE certainty was rated low, so future trials may shift the picture. The subgroup data points one way clearly: EPA-dominant formulas carry the signal, while DHA-dominant ones do not. If you buy a fish oil that is mostly DHA, you are not taking what the positive trials tested. Look for EPA at 60% or more of total EPA plus DHA.

How it fits

Chronic stress runs alongside higher inflammatory markers. EPA lowers pro-inflammatory cytokine production and supports brain-derived neurotrophic factor, which maintains neural resilience. That anti-inflammatory angle is why omega-3 tends to help most when tension travels with inflammation, joint pain, metabolic strain, or low mood.

Dosage

1–2 grams per day of combined EPA/DHA, at least 60% EPA, taken with a meal that contains fat. Give it 8 to 12 weeks. This is a slow mover, not a same-day fix.

Safety

Mild stomach upset and a fishy aftertaste are the usual complaints. Above 3 g/day, bleeding time can lengthen, which matters if you take anticoagulants. The 2024 meta-analysis found no significant rise in adverse events versus placebo.

5. Passionflower (Passiflora incarnata) — Evidence Grade B

Passionflower (Grade B) is a mild option for occasional, situational nerves; a 2024 meta-analysis of nine trials showed benefits for calm and sleep with a good safety record.

Passionflower is underrated. In a double-blind randomized trial in adults with generalized anxiety, passionflower extract reduced anxiety-scale scores over four weeks, with a low rate of daytime drowsiness among participants (Akhondzadeh et al., 2001, J Clin Pharm Ther). A 2024 systematic review and meta-analysis found beneficial effects on anxiety and sleep quality across nine clinical trials, with a favorable safety profile (Samardzic et al., 2024, J Ethnopharmacol).

Its calming effect comes from chrysin and related flavonoids binding to GABA-A receptor sites. The upside is a gentle effect with a good tolerability record. The trade-off is that it is mild; passionflower supports easing occasional nerves rather than delivering a dramatic effect, which makes it a fair option for situational tension like flying, dental visits, or a stressful meeting.

Dosage

500–1,000 mg of standardized extract per day for ongoing use. For occasional situational nerves, a single dose 30 to 60 minutes ahead has support from preoperative studies. Passionflower tea is traditional but delivers a lower, less consistent amount.

Safety

Drowsiness at higher doses. Do not combine it with sedating medications without medical oversight, since the GABA-A activity can stack. Not recommended in pregnancy.

6. Rhodiola Rosea — Evidence Grade B

Rhodiola rosea (Grade B) suits tension that comes with burnout and fatigue; 200 mg twice daily eased anxiety and stress within two weeks in a randomized trial.

Rhodiola suits a particular pattern: tension that comes wrapped in burnout, and it is worth seeing how it compares in ashwagandha vs rhodiola. You feel on edge but also exhausted and foggy, with the worry sitting on top of a deeper fatigue.

An RCT in 80 mildly anxious adults found that Rhodiola extract, 200 mg twice daily, reduced self-reported anxiety, stress, anger, and confusion after 14 days (Cropley et al., 2015, Phytother Res). A 2022 review across multiple trials concluded that Rhodiola consistently eased stress-related symptoms, including fatigue and tension, with a good safety profile (Stojcheva & Quintela, 2022, Molecules).

As an adaptogen, Rhodiola does not simply settle you; it helps restore capacity. Its salidroside and rosavin compounds modulate the stress axis and support monoamine levels under load. For tension that grew out of prolonged overwork or recovery from illness, that fits better than a pure calming agent.

Dosage

200–400 mg per day, standardized to 3% rosavins and 1% salidroside, taken in the morning. Some people find it mildly activating if taken late.

Safety

Generally well tolerated, with occasional dizziness or dry mouth. It may interact with antidepressants and stimulant medications through its effects on monoamines, so check with your provider if you take either.

7. Chamomile (Matricaria chamomilla) — Evidence Grade B

Chamomile (Grade B) is a gentle, low-risk daily option; a University of Pennsylvania trial found 1,500 mg daily reduced generalized-anxiety symptoms, though it did not significantly prevent relapse.

Chamomile gets dismissed because it arrives in a tea bag, which undersells the clinical work behind it.

A long-term randomized trial at the University of Pennsylvania enrolled adults with moderate-to-severe generalized anxiety and treated them with 1,500 mg of pharmaceutical-grade chamomile extract daily. Long-term chamomile was safe and significantly reduced anxiety symptoms; notably, it did not significantly lower the relapse rate versus placebo, and the authors attributed that to a small sample and a lower-than-expected relapse rate in the placebo group (Mao et al., 2016, Phytomedicine). So the fair reading is that chamomile helped reduce symptoms and was well tolerated over an extended period, while its relapse-prevention benefit remains unproven.

The active flavonoid, apigenin, binds the same GABA-A receptor as passionflower, but more gently, and the clinical profile matches: chamomile works quietly. It is a reasonable pick for someone who wants a low-risk daily habit for mild, ongoing tension rather than a strong acute effect.

Dosage

500–1,500 mg of standardized extract per day; the Penn trial used a preparation standardized to 1.2% apigenin. Chamomile tea delivers a lower and less consistent amount, roughly 200–400 mg of dried flower per cup.

Safety

One of the safest options here. People allergic to ragweed or other plants in the Asteraceae family should be cautious. It may thin the blood slightly, so use care alongside anticoagulants.

8. Vitamin D — Evidence Grade C+

Vitamin D (Grade C+) mainly helps when you are deficient and does little for people whose levels are already normal, so test before supplementing.

I nearly left vitamin D off. As a direct calming agent it is weak, and it does not reliably help people whose levels are already normal. It stays on the list for one reason: deficiency is common, and low vitamin D is linked to worse mood, so fixing a genuine shortfall can matter.

Vitamin D receptors sit throughout mood-regulating brain regions, including the hippocampus, prefrontal cortex, and amygdala. The nutrient supports serotonin synthesis and helps modulate inflammation in the nervous system, and deficiency disrupts both.

The practical move is to test rather than guess. A serum 25(OH)D below 30 ng/mL is considered insufficient. If you are below that and struggling with mood, correcting it may help. If your level is already fine, extra vitamin D is unlikely to do much for tension.

Dosage

2,000 IU per day for maintenance, up to 5,000 IU under physician guidance for documented deficiency. It is fat-soluble, so take it with a meal and do not push high doses without lab monitoring.

Safety

Safe at recommended doses. Toxicity is rare but possible above roughly 10,000 IU/day long term, with nausea, kidney stones, and high calcium as warning signs. Test first.

What About Kava, Valerian, and GABA Supplements?

Kava, valerian, and oral GABA are common but weaker choices: kava carries liver-toxicity risk, valerian's anxiety evidence is inconsistent, and oral GABA barely reaches the brain.

Kava

Kava has real short-term evidence, but we left it off because of documented cases of liver toxicity that led several countries to restrict it. The risk-benefit balance does not meet our bar for a general recommendation. If you use it, do so under medical supervision with liver monitoring.

Valerian root

Valerian modulates GABA and works reasonably as a sleep aid, but its evidence for tension specifically, apart from sleep, is inconsistent. It may help when poor sleep is the main driver, but as a standalone option the eight above have better data.

GABA supplements

Here is the pharmacology people miss. Oral GABA does not cross the blood-brain barrier efficiently, so reports of relaxation after taking it may reflect effects on the gut's nervous system rather than the brain. Our PharmD reviewer's take: if the goal is more GABA activity in the brain, oral GABA is the least efficient route. L-theanine supports GABA activity centrally, magnesium supports GABA receptor function, and passionflower and chamomile bind GABA-A receptors directly — all of which reach the brain in a way oral GABA does not.

Supplements for Stress and Everyday Tension

For stress and everyday tension, ashwagandha (which lowers cortisol) and rhodiola (which restores resilience) lead, with magnesium as a supporting player.

Stress is a response to outside demands; tension is the internal alarm that can linger after the demand is gone. Options that help with both tend to work through the stress axis rather than through GABA alone; we rank them in best supplements for stress. Ashwagandha leads here, since it lowers cortisol directly, and rhodiola supports resilience without sedation. Magnesium is a strong supporting player, because stress depletes it and low magnesium amplifies the response. Pairing ashwagandha with magnesium glycinate covers both the hormonal and the neurochemical sides.

Supplements for Social Situations

For social nerves, L-theanine is the best fit: 200 mg taken 30 to 60 minutes ahead settles nerves while keeping thinking sharp.

Social nerves have a signature: a cortisol spike before being evaluated, plus heightened self-monitoring that taxes working memory. You want to stay calm without going foggy. L-theanine fits that better than anything else on the list, because it settles nerves while leaving thinking sharp, which is exactly what a social setting demands. Two hundred milligrams, 30 to 60 minutes ahead, is the approach best supported by the cognitive data. For ongoing social tension, ashwagandha can lower the baseline cortisol reactivity behind the anticipatory dread; one trial tested it in students under exam stress and found reduced perceived stress versus placebo.

Supplements Alongside a Sensitive Gut

For tension alongside a sensitive gut, magnesium glycinate, L-theanine, and chamomile calm the mind without worsening digestion.

The gut-brain axis runs both ways: tension worsens IBS symptoms, and flares feed the tension. Addressing both ends helps. L-theanine modulates glutamate signaling, which touches both central calm and gut motility. Magnesium supports intestinal smooth-muscle function, though glycinate is gentler than citrate here. Omega-3 lowers the systemic inflammation that aggravates both. Chamomile has traditional use for digestive comfort alongside its calming role. A practical daily pairing for someone managing both: magnesium glycinate in the evening, L-theanine in the morning, and chamomile tea, none of which tends to worsen digestion.

Supplements for Low Mood and Tension Together

When low mood and tension occur together, ashwagandha plus an EPA-dominant omega-3 addresses both through different mechanisms.

Low mood and anxious tension travel together often, and the supplements that touch both tend to work through overlapping pathways: serotonin synthesis, inflammation, and the stress axis. Ashwagandha showed effects on stress, anxiety, and depression scores in the 2026 meta-analysis (Alsanie et al., 2026). Omega-3, in EPA-dominant form, has the deepest dedicated evidence for low mood. L-theanine has an emerging mood signal from the 2026 Molecular Psychiatry analysis. And correcting low vitamin D can help when a shortfall is present. If both are equally in play, an EPA-dominant fish oil plus ashwagandha covers two non-overlapping mechanisms.

What We Left Off (and Why)

St. John's Wort

Often raised in this context, but its better evidence is in low mood rather than tension, and it carries serious interaction risk. It can weaken birth control pills, blood thinners, immunosuppressants, and HIV medications, and combined with certain antidepressants it can cause a dangerous reaction. That interaction profile keeps it off a general recommendation list.

CBD

The preclinical work is interesting, but human data is thin, inconsistent, and muddied by product-quality and dosing variability. A few small trials at very high doses show an effect, but those doses are expensive using commercial products, and at the amounts most people actually take there is little convincing evidence. We will revisit it if stronger human trials arrive.

How to Choose

The right starting point depends on your situation. If your tension is chronic and stress-driven, begin with ashwagandha — our best KSM-66 ashwagandha picks compare tested options — and consider magnesium glycinate at night, giving the pair six to eight weeks. If you need something for a specific moment, L-theanine at 200 mg works within the hour without clouding your thinking. If your diet is thin or you suspect a shortfall, get blood work for vitamin D and RBC magnesium and correct what is low before layering on adaptogens, since that alone resolves tension for some people. If your tension travels with inflammation or low mood, an EPA-dominant omega-3 plus ashwagandha covers both over 8 to 12 weeks. And if you want a gentle daily habit rather than a strong effect, chamomile extract is a low-risk option to sustain; when tension mainly shows up as poor sleep, our best supplements for sleep guide is the better starting point.

Safety: Ground Rules for Everything Here

Talk to your healthcare provider before starting any supplement if you take prescription medication, particularly antidepressants, sedatives, blood thinners, thyroid drugs, or immunosuppressants. Several compounds here act on the same receptors as prescription drugs, so natural does not mean pharmacologically inert. If you take a prescription for a diagnosed condition, do not change or stop it on your own, and discuss any additions with the prescriber first.

Start one supplement at a time and give it its tested timeframe before adding another. Stack three at once and feel better in week four, and you will not know which one helped or which caused the headache you have been shrugging off. More is not better either: combining several GABA-pathway supplements can pile up sedation and has not been tested as a combination.

Frequently Asked Questions

What is the best supplement for anxiety?

By the weight and consistency of randomized controlled trial data through 2026, ashwagandha has the strongest evidence base for supporting a calmer response to stress. The right pick for you still depends on the situation: for occasional situational nerves, L-theanine acts far faster, and if a nutritional shortfall is driving the problem, magnesium or vitamin D may address the root more directly. None of these is a substitute for professional care when tension is severe.

What helps calm nerves quickly?

L-theanine is the fastest option here, with effects within 30 to 60 minutes and no clouding of thinking. Passionflower can also help for occasional pre-event nerves, though mild drowsiness is possible. If you are dealing with severe or overwhelming anxiety, that is a medical situation and worth professional support rather than a supplement.

Can I take ashwagandha with my prescription?

Ashwagandha and common anxiety or antidepressant prescriptions act through different primary mechanisms, and the combination has not shown concerning interactions in trials, but ashwagandha has some secondary serotonergic activity, so raise it with your prescriber first. Do not adjust or stop a prescription on your own because you started a supplement.

Is magnesium glycinate or L-threonate better for a calmer baseline?

Glycinate has more direct evidence for easing tension and better tolerability for most people, so it is the sensible starting point. L-threonate has unique brain bioavailability and stronger data for sleep and cognition, so it may be worth the higher cost if restless sleep and mental fog are prominent. Some people use both — glycinate at night, threonate in the morning.

How long do these supplements take to work?

It varies. L-theanine can be felt within 30 to 60 minutes of a single dose. Magnesium may ease sleep-related tension within one to two weeks. Ashwagandha, omega-3, and vitamin D generally need four to twelve weeks of daily use before a clear change shows up.

Is it safe to combine several of these?

Some pairings are well established, such as ashwagandha plus magnesium glycinate, which work through different mechanisms. But stacking several GABA-pathway supplements at once, such as passionflower plus valerian plus chamomile, can add up to excessive sedation. Introduce one at a time and ask your provider about combinations.

Which of these also support low mood?

Ashwagandha, omega-3 fatty acids, and vitamin D each have evidence relevant to both mood and tension. L-theanine has an emerging mood signal, and magnesium has positive data too, especially when baseline levels are low.

Are there options that will not make me drowsy?

L-theanine, ashwagandha, rhodiola, omega-3, and vitamin D do not cause drowsiness at recommended doses. Passionflower, chamomile, and valerian can, especially at higher amounts or in combination. If daytime alertness matters, stick to the non-sedating options.

References

1. Alsanie SA, Alhodieb FS, Askarpour M. Effects of ashwagandha (Withania somnifera) on mental health in adults: a systematic review and dose–response meta-analysis of randomized controlled trials. Complement Ther Med. 2026;97:103325. PMID: 41644067
2. Bachour G, Samir A, Haddad S, et al. Effects of ashwagandha supplements on cortisol, stress, and anxiety levels in adults: a systematic review and meta-analysis. BJPsych Open. 2025. PMC12242034
3. West RE, Biswas A, Rao R, et al. A proprietary herbal extract of ashwagandha root for stress and anxiety in healthy adults: a randomized, double-blind, three-arm, placebo-controlled study. J Med Life. 2026;19(1):49-62. PMID: 41815853
4. Gerolymos C, Saddier E, Boyer L, Fond G. Cognitive and affective effects of L-theanine: a systematic review and meta-analysis of 31 randomized trials. Mol Psychiatry. 2026. PMID: 42410082
5. Moshfeghinia R, Sanaei E, Mostafavi S, et al. The effects of L-theanine supplementation on the outcomes of patients with mental disorders: a systematic review. BMC Psychiatry. 2024;24(1):886. PMID: 39633316
6. Rawji A, Peltier MR, Mourtzanakis K, et al. Examining the effects of supplemental magnesium on self-reported anxiety and sleep quality: a systematic review. Cureus. 2024;16(4):e59317. PMID: 38817505
7. Boyle NB, Lawton C, Dye L. The effects of magnesium supplementation on subjective anxiety and stress — a systematic review. Nutrients. 2017;9(5):429. PMID: 28445426
8. Hausenblas HA, Lynch T, Hooper S, et al. Magnesium-L-threonate improves sleep quality and daytime functioning in adults with self-reported sleep problems: a randomized controlled trial. Sleep Med X. 2024;8:100121. PMC11381753
9. Bafkar N, Zeraattalab-Motlagh S, Jayedi A, Shab-Bidar S. Efficacy and safety of omega-3 fatty acids supplementation for anxiety symptoms: a systematic review and dose-response meta-analysis. BMC Psychiatry. 2024;24(1):455. PMID: 38890670
10. Akhondzadeh S, Naghavi HR, Vazirian M, et al. Passionflower in the treatment of generalized anxiety: a pilot double-blind randomized controlled trial with oxazepam. J Clin Pharm Ther. 2001;26(5):363-367. PMID: 11679026
11. Samardzic J, et al. Passiflora incarnata L. in the treatment of anxiety and sleep disorders: a systematic review and meta-analysis. J Ethnopharmacol. 2024;338:118077. PMID: 38317765
12. Cropley M, Banks AP, Boyle J. The effects of Rhodiola rosea L. extract on anxiety, stress, cognition and other mood symptoms. Phytother Res. 2015;29(12):1934-9. PMID: 26502953
13. Stojcheva EI, Quintela JC. The effectiveness of Rhodiola rosea L. preparations in alleviating various aspects of life-stress symptoms and stress-induced conditions. Molecules. 2022;27(12):3902. PMID: 35745023
14. Mao JJ, Xie SX, Keefe JR, Soeller I, Li QS, Amsterdam JD. Long-term chamomile (Matricaria chamomilla L.) treatment for generalized anxiety disorder: a randomized clinical trial. Phytomedicine. 2016;23(14):1735-1742. PMID: 27912875

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Best Supplements for Anxiety: The Evidence

Metric	Value
Ashwagandha (Grade A)	22-RCT meta · lowers cortisol
L-theanine (Grade A)	31-RCT meta · 30–60 min
Magnesium (Grade A)	15-study review · best if low
Omega-3 (Grade B+)	23-RCT meta · ~2 g/day EPA
Source: YourHealthier · 2024–2026 meta-analyses

Chart: Best Supplements for Anxiety: The Evidence. Data: Ashwagandha (Grade A): 22-RCT dose-response meta-analysis, lowers cortisol; L-theanine (Grade A): 31-RCT meta-analysis, works in 30 to 60 minutes; Magnesium (Grade A): 15-study systematic review, strongest when magnesium is low; Omega-3 (Grade B+): 23-RCT meta-analysis, about 2 grams per day EPA. Source: YourHealthier, 2024-2026 meta-analyses.