By goal
Evidence-Backed Supplements for Mood and Depression
Some supplements have randomized-trial support for low mood and depressive symptoms, saffron, St. John's Wort, and omega-3s (EPA-dominant) are among the most studied, while many popular options rest on thin or preliminary evidence. This guide grades each one and flags interactions. Supplements are not a substitute for professional care, and St. John's Wort in particular interacts dangerously with antidepressants and many other drugs.
| Supplement | Evidence for this goal | Typical dose | Key caution | Studies |
|---|---|---|---|---|
| Creatine Monohydrate | Strong | 3–5 g/day. Optional loading: 20 g/day (split) for 5–7 days. | Very safe. | 21 |
| Folate / Folic Acid | Strong | 400-800 mcg/day for anyone who could become pregnant (start >=1 month b… | Folic acid is generally very safe at recommended doses; the tolerable upper intake level fo… | 14 |
| Vitamin B12 | Strong | 2.4 µg/day RDA; deficiency corrected with high oral (500–1,000 µg) or i… | Very safe; excess excreted. | 25 |
| Ashwagandha | Moderate | 300–600 mg/day of root extract (standardized to 5% withanolides), often… | Avoid in pregnancy (traditionally abortifacient) and while breastfeeding. | 20 |
| Kiwifruit | Moderate | Two green kiwifruit daily (about 140-180 g) is the dose used in most co… | Kiwifruit is a recognised allergen and can cause oral allergy syndrome or, rarely, anaphyla… | 9 |
| L-Theanine | Moderate | 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 |
| N-Acetylcysteine (NAC) | Moderate for this goal | 600–1,800 mg/day; psychiatric trials often use 2,400 mg/day. | Generally safe. | 23 |
| Omega-3 (EPA/DHA) | Moderate for this goal | 1–2 g combined EPA+DHA/day; up to 4 g (Rx) for high triglycerides. | Safe at typical doses. | 21 |
| Saffron | Moderate for this goal | 30 mg/day standardized extract. | Safe at supplement doses. | 22 |
| St. John's Wort | Moderate for this goal | 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 |
| Vitamin D3 | Moderate for this goal | 1,000–2,000 IU/day maintenance; higher to correct deficiency under test… | Tolerable upper limit ~4,000 IU/day for most adults; toxicity (hypercalcemia) occurs with c… | 18 |
| Curcumin (Turmeric) | Preliminary for this goal | 500–1,000 mg curcuminoids/day; bioavailability-enhanced forms preferred. | Generally safe. | 25 |
| Glycine | Preliminary | 3 g before bed for sleep. | Very safe. | 17 |
| 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 |
| Maca | Preliminary for this goal | 1.5–3 g/day of dried root powder (as used in trials). | Generally well tolerated as a food. | 17 |
| Panax Ginseng | Preliminary | 200–400 mg/day standardized extract. | Generally safe short-term. | 18 |
| Probiotics | Preliminary for this goal | Strain-specific; commonly 1–10 billion CFU/day. Match strain to the stu… | Safe for most. | 21 |
| Rhodiola Rosea | Preliminary for this goal | 200–600 mg/day standardized to 3% rosavins / 1% salidroside. | Well tolerated. | 19 |
| Zinc | Preliminary for this goal | 8–11 mg/day RDA; up to 40 mg upper limit. Lozenges (75mg+/day) only sho… | Safe within limits (adult upper limit ~40 mg/day). | 23 |
| 5-HTP | Mixed for this goal | 50–300 mg/day; start low. Do NOT combine with antidepressants. | GI upset common. | 17 |
Supplements for Mood and Depression — common questions
Which supplement has the best evidence for mood and depression?
Omega-3 fish oil (EPA/DHA) and vitamin D3 carry the strongest overall evidence grades on this list, and both are reasonable mood supports — especially if your intake or blood level is low. For depression specifically, St. John's Wort has genuine antidepressant activity in mild-to-moderate cases and saffron shows a real signal, but both sit at moderate evidence. None of them replaces treatment for moderate or severe depression.
How much should I take, and how long until it works?
Typical doses are 1–2 g/day of combined EPA and DHA, vitamin D3 at 1,000–2,000 IU/day for maintenance, saffron at 30 mg/day of standardized extract, or St. John's Wort at 300 mg of standardized extract three times daily. Mood is judged over weeks, not days, so give any of these a fair trial. Timelines vary widely, and some people notice no change at all.
Are these safe to take with antidepressants or other medications?
Read this one carefully. St. John's Wort is a potent CYP3A4 and P-glycoprotein inducer that can gut the effect of many prescription drugs, and it should never be combined with antidepressants outside medical supervision. Ashwagandha and saffron should be avoided in pregnancy. Vitamin D has an upper limit near 4,000 IU/day for most adults. Take your full medication list to a doctor or pharmacist before starting anything here.
Is creatine actually worth taking for depression?
Be honest about what the grade means. Creatine earns its strong rating for strength and power output, not for mood — the depression research is early and much thinner. Curcumin and magnesium are similar: plausible, moderate at best, and easily oversold. Folate and B12 matter most when you are genuinely deficient, which is worth testing for rather than assuming. Fixing a real deficiency beats stacking hopeful extras.