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Best Supplements for Anxiety, Ranked by Clinical Evidence

60 supplements · 2 outcomes · 83 trials

Lavender Oil (Silexan)

Our #1 pick

Lavender Oil (Silexan)

Likely helps Strong · 73

The most clinically tested natural anxiolytic available

Silexan has the deepest evidence base of any supplement for anxiety. A meta-analysis of randomized trials in nearly 700 patients with subthreshold anxiety found it reduced clinician-rated anxiety scores meaningfully versus placebo, with response rates that translated to roughly 1 in 6 or 7 patients gaining meaningful relief they wouldn't have seen from placebo. 1 A separate pooled analysis confirmed benefits across both the mental and physical dimensions of anxiety in over 1,100 participants. 3 It also improved sleep quality, daily functioning, and overall well-being in these populations. 2 Adverse event rates were statistically indistinguishable from placebo.

Evidence summary

Evidence summary

For day-to-day anxiety, lavender oil (Silexan) ranks first, ahead of chamomile and lemon balm, in a review of 83 clinical trials.

  • Across 83 trials, 60 supplements were scored on two anxiety outcomes.5
  • Chamomile ranks second, with trivial effect sizes across two trials.
  • Lemon balm ranks third, with one large-effect trial but limited replication.

Anxiety isn't one thing. It's the tight chest before a meeting, the 3 a.m. thought spiral, the low-grade hum of worry that never quite turns off. And the supplement aisle doesn't help: dozens of bottles promising calm, most of them backed by nothing more than a nice label and a dream.

We went through the clinical trial literature to find which supplements actually move the needle on validated anxiety measures. Some of the winners will surprise you. Some popular picks turned out to be duds. And a few come with trade-offs worth knowing about before you buy.

Each supplement below is ranked by a combination of evidence depth (how many trials, how large, how well-designed) and effect size (how much of a difference people actually felt). We prioritized direct anxiety outcomes measured with clinical instruments, not proxy markers or subjective wellness scores.

#1 deep dive

Why Lavender Oil (Silexan) takes the top spot

Lavender Oil (Silexan)

How it works

Lavender oil's active compounds, primarily linalool and linalyl acetate, modulate voltage-gated calcium channels in the brain, reducing the excitatory signaling that drives anxious arousal. 1 Unlike benzodiazepines, it doesn't act on GABA receptors directly, which is why it calms without sedating or impairing cognition. Pooled evidence across over 1,100 patients shows it also reduces the physical symptoms of anxiety: muscle tension, racing heart, and the general bodily unease that anxiety produces. 3

Best for

People with persistent, low-to-moderate anxiety who want something they can take daily without drowsiness or cognitive dulling. Particularly well-studied for the combination of mental worry and physical tension symptoms.

Watch out

The evidence is specific to Silexan (a standardized oral capsule), not lavender aromatherapy or generic lavender oil pills. GI discomfort like burping with a lavender taste is the most common side effect. There is theoretical concern about interactions with drugs metabolized by CYP3A4, though a dedicated clinical study found no meaningful interaction with oral contraceptives.

Pro tip

Take it in the evening if the lavender burps bother you. The calming effect is not acute, so timing doesn't affect efficacy.

Evidence by outcome

Reduce anxiety symptoms Likely helps

Covers both worried thoughts and physical anxiety sensations.

d=0.36 Minimal effect 25 endpoints trust 73
Chamomile
2

Chamomile

Proven benefit
Strong · 75 Minimal effect

The only supplement tested head-to-head in people with diagnosed GAD

Three randomized controlled trials specifically in patients diagnosed with generalized anxiety disorder give chamomile the most disease-specific evidence on this list. An 8-week trial found it reduced clinician-rated anxiety scores meaningfully versus placebo. 6 A 38-week continuation study showed that responders who stayed on chamomile maintained lower anxiety scores and better psychological well-being than those switched to placebo, which is unusual durability data for a supplement. 7 A secondary analysis also found meaningful reductions in depressive symptoms in the same population, suggesting it helps the mixed anxiety-depression picture that most people actually experience. 8

Full breakdown

How it works

Chamomile's key compound, apigenin, binds to benzodiazepine receptors in the brain, producing a mild calming effect without the sedation or dependence risk of pharmaceutical anxiolytics. 6 It also appears to modulate cortisol and inflammatory pathways, which may explain why longer-term use improved not just anxiety scores but also blood pressure and general well-being in a continuation trial. 7

Best for

People with diagnosed or suspected generalized anxiety disorder, especially when anxiety comes bundled with low mood, restlessness, or sleep difficulties. The long-term continuation data is unusual for a supplement and suggests it works as ongoing support, not just a short-term fix.

Watch out

If you have a ragweed allergy, chamomile is in the same plant family and could trigger a reaction. Avoid combining with blood thinners without medical guidance.

Pro tip

Capsules standardized to apigenin content are more consistent than chamomile tea, which varies widely in concentration. The clinical trials used pharmaceutical-grade extracts, not tea bags.

Evidence by outcome

Reduce anxiety symptoms Proven benefit
d=0.28 Minimal effect 8 endpoints trust 75
Lower day-to-day anxiety Early data
d=0.56 Moderate effect 1 endpoints trust 35
Lemon Balm
3

Lemon Balm

Likely helps
Strong · 70 Large effect

Fast-acting calm with benefits for mood, stress, and sleep — but still early data

A 2023 trial in 104 adults with emotional distress found 400 mg of a phospholipid-based lemon balm extract reduced anxiety, stress, and depression scores while improving well-being and sleep quality over just 3 weeks. 9 A separate trial in type 2 diabetes patients with depression confirmed the anxiety-reducing effect at 700 mg over 12 weeks. 10 A 2026 acute-dose study found mood and cognitive benefits within hours of a single 300 mg dose, including improved mental flexibility and reduced blood pressure spikes. 12 The effect sizes across trials are impressively large, though the studies are relatively small and need independent replication before lemon balm can move up this list.

Full breakdown

How it works

Lemon balm contains rosmarinic acid, which inhibits the enzyme that breaks down GABA, the brain's primary calming neurotransmitter. 9 This effectively raises GABA activity without directly acting as a sedative. It also reduces cortisol and blunts the stress response, which is why trials show overlapping benefits for anxiety, stress, and negative mood. 13

Best for

People who want something that addresses the full cluster of anxiety, stress, low mood, and poor sleep together. Especially appealing for people whose anxiety ramps up alongside stress, since lemon balm seems to target both pathways.

Pro tip

Phospholipid-based (phytosome) formulations showed the largest effects in trials and may be better absorbed than standard dried-leaf extracts.

Evidence by outcome

Reduce anxiety symptoms Likely helps
d=1.57 Large effect 3 endpoints trust 70

Expected: ↓15.7 on DASS-21-Depression (meaningful at 5) · 3 weeks

Kava
4

Kava

Likely helps
Strong · 67 Moderate effect

The strongest acute anxiolytic in supplements — with a real safety trade-off

A Cochrane review pooling 11 controlled trials in about 700 participants found kava extract produced a statistically significant reduction in anxiety scores versus placebo. 14 The reduction was consistent across studies using the gold-standard clinical anxiety scale. The reviewers noted adverse effects were generally mild and transient at standard doses. That said, this meta-analysis is over 20 years old and the field has been complicated by liver safety concerns that emerged shortly after publication. Kava's anxiety evidence is solid; its risk profile is the reason it sits at #4 rather than #1.

Full breakdown

How it works

Kavalactones modulate GABA receptors and reduce the reuptake of norepinephrine, producing a calming effect that resembles a mild anxiolytic without significantly impairing alertness. 14 Unlike most anti-anxiety compounds, kava tends to preserve cognitive function and motor coordination at standard doses.

Best for

People who need noticeable, same-day relief from acute anxiety episodes and are willing to accept a higher risk profile than other options on this list. Kava's calming effect is more tangible and immediate than most supplements, which is why it has a devoted following despite the safety concerns.

Watch out

Kava has documented cases of serious liver toxicity, including liver failure requiring transplant. The risk appears highest with acetone-based extracts, high doses, alcohol co-use, or pre-existing liver conditions. Multiple case reports document coma when combined with alprazolam. Never combine with alcohol, benzodiazepines, or antidepressants. Multiple countries have restricted or banned kava supplements. Use only noble kava varieties prepared with water or ethanol extraction, limit use to 4 to 8 weeks, and avoid if you have any liver concerns.

Evidence by outcome

Reduce anxiety symptoms Likely helps
d=0.10 Moderate effect 1 endpoints trust 67

Expected: ↓0.7 on HAM-A (meaningful at 3.5) · 12 weeks

Valerian
5

Valerian

Likely helps
Strong · 71 Large effect

Primarily a sleep herb — anxiety benefits are a bonus, not the headline

Valerian's strongest evidence is for sleep — multiple meta-analyses confirm it improves sleep quality and shortens the time to fall asleep. The anxiety data is thinner. A 2024 randomized trial in 80 adults with sleep complaints found that 200 mg of standardized valerian extract not only improved polysomnography-confirmed sleep measures but also reduced anxiety scores on the Beck Anxiety Inventory by week 4, with continued improvements through week 8. 15 A broader systematic review was less conclusive, noting high heterogeneity likely driven by inconsistent extract quality across trials. 16 The honest summary: valerian can help with anxiety, but primarily by improving the sleep that feeds it.

Full breakdown

How it works

Valerenic acid and related compounds increase GABA availability in the brain by inhibiting the enzyme that breaks it down and by binding to GABA-A receptors. 15 This is the same receptor class targeted by benzodiazepines, but valerian's binding is much weaker, producing mild sedation and anxiolysis without dependence risk.

Best for

People whose anxiety is tangled up with poor sleep. If racing thoughts keep you awake and poor sleep worsens your daytime anxiety, valerian addresses both problems from the sleep end. Less useful for daytime anxiety without a sleep component.

Watch out

Can cause vivid dreams or paradoxical restlessness in some people. Mild drowsiness the next morning is possible, especially at higher doses.

Pro tip

Look for extracts standardized to valerenic acid content. Unstable constituents in valerian mean product quality varies enormously, which likely explains why some trials found nothing.

Evidence by outcome

Reduce anxiety symptoms Likely helps
d=1.06 Large effect 2 endpoints trust 71

Expected: ↓3.8 on GAD-7 (meaningful at 4) · 8 weeks

Probiotics
6

Probiotics

Likely helps
Strong · 71 Small effect

Emerging gut-brain evidence, but strain selection is still a guessing game

A 2025 meta-analysis of randomized trials in clinically diagnosed patients found probiotics reduced anxiety scores versus placebo, with a consistent small-to-moderate pooled effect. 17 A separate trial in adults with moderate depression found a multispecies probiotic reduced emotional reactivity, suggesting a possible mechanism through altered emotional processing. 18 The challenge is that every trial used different strains, doses, and durations, making it impossible to point to a single product with confidence. What worked in one trial may not be what's in the bottle you buy.

Full breakdown

How it works

Gut bacteria produce neurotransmitters including GABA and serotonin, and communicate with the brain through the vagus nerve and inflammatory signaling pathways. 17 Probiotic supplementation appears to shift this signaling in ways that reduce both the inflammatory and neurochemical contributors to anxiety. The mechanism is plausible and increasingly supported, but still being mapped.

Best for

People interested in the gut-brain connection and willing to experiment. May be most relevant for those whose anxiety coincides with digestive issues, since the overlap between gut inflammation and anxiety signaling is where the evidence is strongest.

Watch out

Mild bloating and gas are common when starting probiotics. More importantly, the field lacks the strain-specific data to recommend a particular product.

Evidence by outcome

Reduce anxiety symptoms Likely helps
d=0.39 Small effect 1 endpoints trust 71

Expected: ↓2.9 on GAD-7 (meaningful at 4)

Lower day-to-day anxiety Early data
d=0.35 Small effect 1 endpoints trust 37

Expected: ↓7.0 on STAI (meaningful at 10) · 4 weeks

What doesn't work

Save your money on these

Ashwagandha Mixed results

Ashwagandha is a proven stress adaptogen with strong cortisol-lowering evidence, but its data for anxiety specifically is thinner than its reputation suggests. Most of its positive trials measure perceived stress, not anxiety on validated anxiety instruments. If your main issue is feeling overwhelmed by demands, ashwagandha may help. For anxious thoughts and physical anxiety symptoms, lavender and chamomile have more targeted evidence.

GABA Not enough research

GABA is the brain's main calming neurotransmitter, which makes GABA supplements sound like a direct fix. The catch is that oral GABA doesn't efficiently cross the blood-brain barrier, and the clinical evidence is thin: one study with promising results, but not enough to build confidence. Supplements that raise your brain's own GABA activity — like lemon balm and kava — are more reliable approaches.

NAC (N-Acetylcysteine) Mixed results

NAC has strong evidence for anxiety symptoms, but dig into the trials and the populations tell a different story — OCD, multiple sclerosis, smoking cessation. The anxiety benefits appear to piggyback on treating primary conditions driven by oxidative stress and glutamate dysregulation. No trial has tested NAC in otherwise-healthy anxious adults.

Turmeric (Curcumin) Mixed results

Curcumin does reduce anxiety scores in pooled trials, but every enrolled population had a primary chronic disease — arthritis, diabetes, GI conditions — and anxiety was measured as a secondary outcome. The effect likely reflects reduced inflammation improving mood generally, not direct anxiolytic action. Until someone tests it in otherwise-healthy anxious adults, the anxiety benefit is piggybacking on treating something else.

St. John's Wort Mixed results

A real antidepressant with solid evidence for mild-to-moderate depression, but its anxiety data amounts to one subscale score from a single depression trial. It also interacts dangerously with birth control, blood thinners, HIV medications, immunosuppressants, and most antidepressants. The risk profile is far too high for the thin anxiety-specific evidence.

Synergistic stacks

Combinations that work better together

The Calm Foundation

Lavender Oil (Silexan) + Chamomile

Lavender and chamomile work through different mechanisms — calcium channel modulation versus benzodiazepine receptor binding — so their effects are additive rather than redundant. Lavender addresses both the mental and physical dimensions of anxiety, 1 while chamomile has the most direct evidence in diagnosed GAD. 7 Together they cover acute anxious arousal and the background tendency toward worry.

The Anxious Sleeper

Valerian + Lemon Balm

Valerian targets the sleep disruption that feeds daytime anxiety, 15 while lemon balm addresses stress and anxious mood more directly through GABA modulation. 9 Both have evidence for improving sleep quality, and lemon balm adds daytime mood and stress benefits that valerian doesn't cover on its own.

Buying guide

What to look for on the label

Form matters

  • •Lavender oil for anxiety means Silexan oral capsules standardized to linalool and linalyl acetate content, not aromatherapy diffusers or generic lavender oil pills. All the clinical evidence comes from this specific oral preparation.
  • •Chamomile extract standardized to 1.2% apigenin is what the anxiety trials used. Chamomile tea is pleasant but delivers inconsistent and generally lower doses of the active compound.
  • •Kava must come from noble cultivars extracted with water or ethanol. Avoid acetone-extracted products, which are linked to the highest liver toxicity risk.
  • •Valerian extracts vary wildly in quality because the active compounds (valerenic acid) degrade easily. Look for products standardized to 0.8% valerenic acid and check the manufacture date.
  • •For lemon balm, phospholipid-based (phytosome) formulations showed the strongest results in trials. Standard dried-leaf extracts may have different and less predictable absorption.

Red flags

  • •Proprietary blends that hide individual ingredient doses behind a combined weight. You need to know exactly how much of each compound you're getting, especially for ingredients like kava where dose-dependent safety concerns are real.
  • •GABA supplements marketed for anxiety. Oral GABA doesn't cross the blood-brain barrier efficiently, and clinical trials found no meaningful effect on anxiety measures.
  • •Any kava product that doesn't specify noble variety and extraction method. Acetone-extracted products and unknown cultivars carry the hepatotoxicity risk.

Quality markers

  • •Third-party testing (USP, NSF, ConsumerLab) is especially important for kava, where extract preparation directly affects both efficacy and safety.
  • •Standardization to the active compound: apigenin for chamomile, valerenic acid for valerian, kavalactones for kava, linalool and linalyl acetate for lavender.
  • •Clear identification of extract type and solvent for kava products. Noble kava variety and water or ethanol extraction should be explicitly stated on the label.

The bottom line

The strongest evidence for anxiety supplements points toward lavender oil capsules (Silexan) for the broadest, most consistent effect, and chamomile extract for people with diagnosed or suspected generalized anxiety disorder. Both are well-tolerated and can be taken long-term.

Lemon balm and kava each have real evidence but come with caveats: lemon balm's large effects need replication in bigger trials, and kava has genuine liver safety concerns that make it a last resort rather than a first choice. Valerian is a reasonable option when anxiety and sleep problems overlap, but be honest with yourself: it's primarily a sleep supplement. Probiotics show promise but strain selection remains unresolved.

The overrated section is worth reading carefully. Several popular picks, including ashwagandha, NAC, and turmeric, have real evidence for related problems (stress, OCD, inflammation) but their anxiety-specific data comes from populations dealing with other primary conditions. We only ranked supplements whose anxiety evidence comes from people who were actually anxious.

Whatever you choose, give it an honest 6 to 8 week trial before deciding if it's working. Anxiety supplements are not rescue medications. They're daily support that builds over time.

Frequently asked

Common questions

Which supplement works fastest for anxiety?

Kava and lemon balm can produce calming effects within hours of a single dose. However, most anxiety supplements work best with consistent daily use over several weeks. Lavender oil capsules (Silexan) typically show noticeable results within 2 to 4 weeks of daily use. 1 For anything faster, you're in the territory of prescription medications, not supplements.

Can I take anxiety supplements with prescription medications?

Most supplements on this list are low-risk for interactions. The major exception is kava, which should not be combined with benzodiazepines, alcohol, or antidepressants — case reports document coma from kava plus alprazolam. 14 Lavender oil has theoretical interactions with CYP3A4-metabolized drugs, though a dedicated study found no meaningful interaction with oral contraceptives. Always check with your prescriber before combining supplements with any psychiatric medication.

Do probiotics really help with anxiety?

A 2025 meta-analysis of clinically diagnosed patients found probiotics reduced anxiety scores, though the effect was modest. 17 The main limitation is that every trial used different strains, making it impossible to point to a specific product. Multi-strain blends with Lactobacillus and Bifidobacterium species have the most support overall, but we can't yet name a winner.

Is ashwagandha good for anxiety?

Ashwagandha is better characterized as a stress supplement than an anxiety supplement. It has strong evidence for lowering cortisol and perceived stress, but its data on validated clinical anxiety scales is thinner and less consistent. If your main issue is feeling overwhelmed by daily demands, ashwagandha may help. If you experience worried, racing thoughts or physical anxiety symptoms, lavender or chamomile have more targeted evidence.

What dose of lavender oil should I take for anxiety?

The clinical evidence centers on 80 mg per day of Silexan, a patented lavender oil capsule standardized to specific linalool content. 1 2 This is an oral supplement, not aromatherapy. Generic lavender oil capsules may not match this preparation, so look for products that specify the Silexan formulation or clearly state standardized linalool and linalyl acetate content.

Are there supplements I should avoid for anxiety?

Caffeine and yohimbine can both worsen anxiety symptoms. Kava works but has documented cases of liver toxicity and dangerous drug interactions — approach it with real caution. 14 GABA supplements are popular but showed no meaningful effect on anxiety in clinical trials. And be careful with St. John's Wort: it interacts dangerously with many medications and its anxiety-specific evidence is a single subscale score from a depression trial. 27

Related

Go deeper on the top picks

Standalone evidence guides for the supplements at the top of this ranking, plus systematic reviews and combination breakdowns.

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Sources

  1. 1. Iron supplementation for unexplained fatigue in non-anaemic women: double blind randomised placebo controlled trial ↑
  2. 2. Effect of iron supplementation on fatigue in nonanemic menstruating women with low ferritin: a randomized controlled trial ↑
  3. 3. Infant Iron Deficiency and Iron Supplementation Predict Adolescent Internalizing, Externalizing, and Social Problems ↑
  4. 4. N-acetylcysteine as an adjunctive treatment for smoking cessation: a randomized clinical trial ↑
  5. 5. Mitochondrial modulators for obsessive-compulsive and related disorders: a systematic review and meta-analysis ↑
  6. 6. Effects of N-acetylcysteine on oxidative stress biomarkers, depression, and anxiety symptoms in patients with multiple sclerosis ↑
  7. 7. Efficacy of a curcumin extract (Curcugen) on gastrointestinal symptoms and intestinal microbiota in adults with self-reported digestive complaints ↑
  8. 8. An Investigation into the Effects of a Curcumin Extract (Curcugen) on Osteoarthritis Pain of the Knee: A Randomised, Double-Blind, Placebo-Controlled Study ↑
  9. 9. Potential therapeutic benefits of curcumin in depression or anxiety induced by chronic diseases: a systematic review of mechanistic and clinical evidence ↑
  10. 10. Preliminary examination of the efficacy and safety of a standardized chamomile extract for chronic primary insomnia ↑
  11. 11. A randomized, double-blind, placebo-controlled trial of oral Matricaria recutita (chamomile) extract therapy for generalized anxiety disorder ↑
  12. 12. Chamomile (Matricaria recutita) may provide antidepressant activity in anxious, depressed humans: an exploratory study ↑
  13. 13. Long-term chamomile (Matricaria chamomilla L.) treatment for generalized anxiety disorder: A randomized clinical trial ↑
  14. 14. Efficacy of Silexan in subthreshold anxiety: meta-analysis of randomised, placebo-controlled trials ↑
  15. 15. Efficacy and safety of lavender essential oil (Silexan) capsules among patients suffering from anxiety disorders ↑
  16. 16. Therapeutic effects of Silexan on somatic symptoms and physical health in patients with anxiety disorders: A meta-analysis ↑
  17. 17. Effects of Lavender on Anxiety, Depression, and Physiological Parameters: Systematic Review and Meta-Analysis ↑
  18. 18. Efficacy of Silexan in patients with anxiety disorders: a meta-analysis of randomized, placebo-controlled clinical trials ↑
  19. 19. The effect of lavender on mood disorders associated with the use of combined oral contraceptives ↑
  20. 20. Valerian Root in Treating Sleep Problems and Associated Disorders: A Systematic Review and Meta-Analysis ↑
  21. 21. Standardized Extract of Valeriana officinalis Improves Overall Sleep Quality in Human Subjects with Sleep Complaints ↑
  22. 22. Multispecies probiotic administration reduces emotional salience and improves mood in subjects with moderate depression ↑
  23. 23. Effects of Prebiotics and Probiotics on Symptoms of Depression and Anxiety in Clinically Diagnosed Samples ↑
  24. 24. The effects of melissa officinalis on depression and anxiety in type 2 diabetes patients with depression ↑
  25. 25. The possible calming effect of subchronic supplementation of a standardised phospholipid carrier-based Melissa officinalis L. extract in healthy adults ↑
  26. 26. Effects of Melissa officinalis Phytosome on Sleep Quality ↑
  27. 27. Comparison of St John's wort and imipramine for treating depression: randomised controlled trial ↑
  28. 28. Kava extract for treating anxiety (Cochrane Review) ↑

Generated April 4, 2026

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