Best Supplements for Reduced Depression Symptoms
Ranked by research evidence. Compare 82 supplements across 119 papers from the biomedical literature, with effect direction, evidence strength, and dose range for each.
Top picks by evidence
- Moderate evidence4 studies
Across 4 studies, all reported beneficial effects of Lactobacillus helveticus Rosell-52 on reducing depressive symptoms, with moderate effect sizes in the highest-quality evidence. A 2025 meta-analysis of 7 RCTs found a significant moderate reduction (SMD, -0.55; 95% CI, -1.04 to -0.06), and a 2025 review of 19 RCTs confirmed significant amelioration of depression status with probiotics. Evidence predominantly targets general adult populations, but study durations and doses were not consistently reported.
- Moderate evidence4 studies
Across 4 studies, all reported beneficial effects for St. John's Wort on reduced depression symptoms, with effect sizes ranging from small to moderate (two studies each). The highest-quality evidence (a 2024 systematic review) indicated moderate beneficial effects. The evidence comes entirely from reviews and systematic reviews, with no primary RCTs in the dataset.
- Moderate evidence4 studies
Across 4 studies, 3 reported beneficial small effects on depression symptoms, while 1 found no effect. The strongest evidence comes from a meta-analysis (2026) and a systematic review (2025), though the latter had neutral findings. No consistent dose range or form could be identified due to lack of reporting.
Product matchViva Naturals — Vitamin D3 with Organic Liquid Coconut Oil125 mcg · $15.16 · ★5.0 (208)
82 supplements
- LowSaffronAcross 5 studies, 4 reported beneficial effects of saffron on reduced depression symptoms, with one neutral finding. The predominant effect size was moderate, seen in clinical populations including adults with Parkinson's disease, unipolar or bipolar depression, and major depressive disorder. The most-studied dose range was 30–100 mg/day, and effects were typically observed at 6–12 weeks (median study duration 56 days). · Dose: 30–100 mg/day4 beneficial1 neutral5 studies
- ModerateLactobacillus helveticus Rosell-52Across 4 studies, all reported beneficial effects of Lactobacillus helveticus Rosell-52 on reducing depressive symptoms, with moderate effect sizes in the highest-quality evidence. A 2025 meta-analysis of 7 RCTs found a significant moderate reduction (SMD, -0.55; 95% CI, -1.04 to -0.06), and a 2025 review of 19 RCTs confirmed significant amelioration of depression status with probiotics. Evidence predominantly targets general adult populations, but study durations and doses were not consistently reported.4 beneficial4 studies
- ModerateSt. John's WortAcross 4 studies, all reported beneficial effects for St. John's Wort on reduced depression symptoms, with effect sizes ranging from small to moderate (two studies each). The highest-quality evidence (a 2024 systematic review) indicated moderate beneficial effects. The evidence comes entirely from reviews and systematic reviews, with no primary RCTs in the dataset.4 beneficial4 studies
- ModerateVitamin DAcross 4 studies, 3 reported beneficial small effects on depression symptoms, while 1 found no effect. The strongest evidence comes from a meta-analysis (2026) and a systematic review (2025), though the latter had neutral findings. No consistent dose range or form could be identified due to lack of reporting.3 beneficial1 neutral4 studies
- LowLavenderAcross 4 studies, 3 reported beneficial effects of lavender on reducing depression symptoms, with effect sizes ranging from small to moderate. The only randomized controlled trial (RCT) found a neutral effect (no significant difference), while systematic reviews support benefit. The median study duration was 28 days, but only one study reported duration. No specific dose or form was consistently reported across studies.3 beneficial1 neutral4 studies
- ModerateL-MethylfolateAcross 3 studies, all reported beneficial effects of L-methylfolate on depression symptoms, with all findings statistically significant. Effect sizes are mixed (small to large), with the highest-quality evidence (a meta-analysis of 507 adults with MDD) showing a moderate effect (standardized mean difference = -0.38). The median study duration was 42 days, though only 1 of 3 studies reported duration; the most studied dose was 15 mg/day (from one small trial). Populations included adults with major depressive disorder and bipolar depression.3 beneficial3 studies
- ModerateMagnesiumAcross 3 studies (including 1 meta-analysis and 1 systematic review), all reported beneficial small-sized effects of magnesium on reducing depression symptoms. The evidence base is small, and no consistent dose, form, or duration data were available.3 beneficial3 studies
- LowBifidobacterium plantarumAcross 3 studies, all reported beneficial moderate-sized effects on reduced depression symptoms. Two of the three studies found statistically significant reductions. The evidence base includes a systematic review and a meta-analysis, but the studies primarily involve formulations containing *Lactobacillus plantarum* (a related species) rather than *Bifidobacterium plantarum* alone. Populations studied include adults with or without mood disturbances, patients with depression, and adolescents with depression; no consistent dose or duration was reported.3 beneficial3 studies
- LowSaffronAcross all 3 studies in the database, all reported beneficial effects of saffron on reducing depression symptoms, with effect sizes ranging from small to moderate. The top study (a systematic review with evidence score 5) reported a moderate beneficial effect. No consistent dose, form, or population data were available across studies. The evidence base is small (only 3 studies) — conclusions should be considered preliminary.3 beneficial3 studies
- LowBifidobacterium bifidum Rosell-71Across 3 studies, all reported beneficial moderate effects of Bifidobacterium bifidum Rosell-71 on reducing depressive symptoms, with 2 studies finding statistically significant results. Evidence is drawn primarily from meta-analyses and reviews, though study durations and specific doses were not consistently reported. The most robust study (a 2025 meta-analysis) found a significant moderate effect (SMD, -0.55; 95% CI, -1.04 to -0.06).3 beneficial3 studies
- LowL-CarnosineAcross 3 studies, 1 reported a beneficial moderate-sized effect of L-carnosine on reducing depression symptoms, while 2 studies found neutral effects. The single beneficial study involved patients with major depressive disorder (MDD) using 400 mg twice daily for 6 weeks. Effects were predominantly neutral, and the median study duration was 49 days, but the evidence base is too small to draw firm conclusions about typical dose ranges or populations. · Dose: 400 mg twice daily1 beneficial2 neutral3 studies