Best Supplements for Reduced Depression Symptoms
Ranked by research evidence. Compare 81 supplements across 116 papers from the biomedical literature, with effect direction, evidence strength, and dose range for each.
Top picks by evidence
- Low evidence5 studies
Across 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/day - Low evidence4 studies
Across 4 studies, all reported beneficial effects of Lactobacillus helveticus Rosell-52 on depression symptoms, with effect sizes ranging from small to moderate. A 2025 meta-analysis of 7 RCTs found a significant moderate-sized reduction in depressive symptoms (SMD -0.55, p=0.03). The evidence base is small and drawn primarily from reviews and meta-analyses including multi-strain probiotics, so the specific contribution of this single strain is not fully isolated.
- Low evidence4 studies
Across 4 studies, 3 reported beneficial small-sized effects of vitamin D on reducing depression symptoms, and 1 found neutral effects. The evidence primarily comes from reviews and observational studies, with a small effect size, but no specific dose, form, or study duration data were consistently reported. Effects were predominantly small, and the most studied population segments included adolescents and the elderly.
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- 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
- LowLactobacillus helveticus Rosell-52Across 4 studies, all reported beneficial effects of Lactobacillus helveticus Rosell-52 on depression symptoms, with effect sizes ranging from small to moderate. A 2025 meta-analysis of 7 RCTs found a significant moderate-sized reduction in depressive symptoms (SMD -0.55, p=0.03). The evidence base is small and drawn primarily from reviews and meta-analyses including multi-strain probiotics, so the specific contribution of this single strain is not fully isolated.4 beneficial4 studies
- LowVitamin DAcross 4 studies, 3 reported beneficial small-sized effects of vitamin D on reducing depression symptoms, and 1 found neutral effects. The evidence primarily comes from reviews and observational studies, with a small effect size, but no specific dose, form, or study duration data were consistently reported. Effects were predominantly small, and the most studied population segments included adolescents and the elderly.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
- LowBifidobacterium plantarumAcross 3 studies (all systematic reviews or meta-analyses), all reported moderate beneficial effects of Bifidobacterium plantarum-containing probiotics on depressive symptoms, with 2 reaching statistical significance. The evidence is preliminary and predominantly based on multi-strain formulations, making the specific contribution of Bifidobacterium plantarum unclear. Effect sizes were consistently moderate, but no consistent dose, form, or population was identified.3 beneficial3 studies
- LowMagnesiumAcross 3 studies, all reported beneficial but small effects of magnesium on reducing depression symptoms. The evidence, drawn from a meta-analysis, a systematic review, and a review, suggests modest improvements associated with magnesium intake, particularly in clinical populations. The median study duration was not consistently reported.3 beneficial3 studies
- LowL-MethylfolateAll 3 studies (3 of 3) reported beneficial effects for L-methylfolate on reducing depressive symptoms, with effect sizes varying from small to large. The strongest evidence, a meta-analysis of 4 studies (N=507) in adults with major depressive disorder, found a moderate beneficial effect (standardized mean difference = -0.38, 95% CI -0.59 to -0.17, p=0.0003). One clinical trial used 15 mg/day for 42 days, and the median study duration among those reporting was 42 days.3 beneficial3 studies
- LowSaffronAcross all 3 studies in the database, saffron shows beneficial effects on reducing depression symptoms, with effect sizes ranging from small to moderate and all findings statistically significant. The evidence includes one systematic review (2018) reporting a moderate effect and a favorable risk-benefit profile, and two reviews (2022, 2025) noting small beneficial effects. No specific dose or duration data were consistently reported, and no form data were extracted.3 beneficial3 studies
- LowBifidobacterium bifidum Rosell-71Across 3 studies in the database, all 3 reported beneficial effects of Bifidobacterium bifidum Rosell-71 (as part of probiotic supplementation) on depressive symptoms, with 2 studies finding statistically significant results. A 2025 meta-analysis reported a moderate, significant reduction (SMD -0.55; p=0.03) compared to placebo. Evidence is preliminary due to the small number of indexed studies, and the predominant effect size is moderate.3 beneficial3 studies
- LowSt. John's WortAcross 3 studies, all reported beneficial effects on depression symptoms, with a predominant moderate effect size (two studies reported moderate effects, one reported small effects). Doses and treatment durations were not consistently reported, and populations were largely unspecified (one review focused on children and adolescents).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