By goal
Evidence-Backed Supplements for Stress and Anxiety
Some supplements have randomized-trial evidence for easing day-to-day stress and anxiety symptoms, while many popular options rest on thin or preliminary data. This hub grades what the research actually shows for each substance, so you can decide with clear eyes. Supplements are not a substitute for professional care for persistent or severe anxiety.
| Supplement | Evidence for this goal | Typical dose | Key caution | Studies |
|---|---|---|---|---|
| Ashwagandha | Moderate for this goal | 300–600 mg/day of root extract (standardized to 5% withanolides), often… | Avoid in pregnancy (traditionally abortifacient) and while breastfeeding. | 20 |
| Holy Basil (Tulsi) | Moderate for this goal | ~300 mg/day of standardized extract (or brewed leaves). | Generally safe. | 15 |
| Kava | Moderate | Standardized extracts ~120–280 mg kavalactones/day, short-term (≤8 week… | ⚠ Rare but serious liver injury. | 16 |
| L-Theanine | Moderate for this goal | 100–200 mg; often paired 1:2 with caffeine (e.g. 100mg theanine + 50mg… | Very safe, no known serious side effects. | 18 |
| Magnesium | Moderate | 200–400 mg elemental/day. Glycinate & citrate absorb best; oxide is poo… | Safe. | 22 |
| Papaya | Moderate | A typical serving is 1 cup of cubes (about 145 g) or roughly half a sma… | Papaya can trigger allergy in latex-sensitised individuals (latex-fruit syndrome) via cross… | 12 |
| Pomegranate | Moderate | A common serving is about 1 cup of arils (174 g) or roughly half a frui… | Generally safe as a food. | 9 |
| Red Grape | Moderate | A typical serving is about 1 cup (~150 g, ~17 grapes); intervention tri… | High in free sugars (~23 g per cup) and easy to overeat, so portion control matters for gly… | 11 |
| Saffron | Moderate for this goal | 30 mg/day standardized extract. | Safe at supplement doses. | 22 |
| St. John's Wort | Moderate | Standardized extract (e.g., 0.3% hypericin / ~3-5% hyperforin) 300 mg t… | DANGER: This is a pharmacologically active herb, not a benign supplement. | 17 |
| 5-HTP | Preliminary | 50–300 mg/day; start low. Do NOT combine with antidepressants. | GI upset common. | 17 |
| Acai Berry | Preliminary | Commonly eaten as 100 g (about half a 200 g pack) of unsweetened frozen… | Generally well tolerated as a food. | 8 |
| Bacopa Monnieri | Preliminary for this goal | 300 mg/day standardized to ~50% bacosides; effects build over 8–12 week… | Generally safe. | 22 |
| Glycine | Preliminary for this goal | 3 g before bed for sleep. | Very safe. | 17 |
| Gotu Kola | Preliminary for this goal | ~500 mg twice daily of extract. | Generally well tolerated; possible drowsiness and GI upset. | 21 |
| Inositol (Myo-Inositol) | Preliminary for this goal | PCOS: typically 2 g myo-inositol twice daily (4 g/day), often with 400… | Generally well tolerated; the most common side effects are mild, dose-related gastrointesti… | 16 |
| Reishi | Preliminary | 1.5–9 g/day of extract (standardized to polysaccharides/triterpenes). | Generally safe for a few months. | 19 |
| Rhodiola Rosea | Preliminary for this goal | 200–600 mg/day standardized to 3% rosavins / 1% salidroside. | Well tolerated. | 19 |
| Valerian Root | Mixed | 300–600 mg extract 30–60 min before bed. | Generally safe short-term. | 16 |
Supplements for Stress and Anxiety — common questions
Which supplement has the best evidence for stress and anxiety?
Ashwagandha and L-theanine are the two best-supported options, both sitting at moderate evidence. Ashwagandha is the classic adaptogen studied for perceived stress and cortisol; L-theanine, from green tea, is studied for calm but alert focus. Kava is genuinely calming for anxiety but carries a real liver warning. Moderate means promising human data, not proof — expect a modest effect, not a cure.
How much should I take, and how long before ashwagandha or L-theanine starts working?
Typical ashwagandha dosing is 300–600 mg/day of root extract standardized to 5% withanolides, often split morning and evening. L-theanine is 100–200 mg, sometimes paired with caffeine at roughly 1:2 (100 mg theanine to 50 mg caffeine). L-theanine tends to be felt the same day; herbal adaptogens are usually taken for weeks. Timelines vary a lot between people, and some notice nothing at all.
Are these supplements safe to take with my medications?
Not all of them. St. John's Wort is the biggest danger — it induces CYP3A4 and P-glycoprotein and can gut the effect of many prescription drugs, with life-threatening consequences. Kava has been linked to rare but serious liver injury; avoid it with alcohol, liver disease, hepatotoxic drugs, or sedatives. Ashwagandha should be avoided in pregnancy and breastfeeding. Run your full list past a doctor or pharmacist first.
Is inositol worth taking for anxiety, or does it not really work?
Be skeptical here. Inositol is mainly studied for PCOS ovulation and insulin sensitivity, where doses run around 2 g twice daily; its mood and anxiety data are noticeably weaker. Saffron (30 mg/day of standardized extract) has antidepressant signals but is expensive for what it delivers. If you want the strongest starting point for stress specifically, ashwagandha or L-theanine is the better bet.