Best Supplements for Reduced Depression Symptoms
Ranked by research evidence. Compare 80 supplements across 112 papers from the biomedical literature, with effect direction, evidence strength, and dose range for each.
Top picks by evidence
- 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.
Product matchViva Naturals — Vitamin D3 with Organic Liquid Coconut Oil125 mcg · $15.16 · ★5.0 (208) - Low evidence3 studies
Across 3 studies, all reported beneficial effects of saffron on depressive symptoms, with effect sizes ranging from small to moderate, and predominantly moderate. Doses typically around 30 mg per day, and effects observed across clinical and child populations. Median study duration was 56 days (8 weeks).
Dose: 30 mg per day
- 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
- LowSaffronAcross 3 studies, all reported beneficial effects of saffron on depressive symptoms, with effect sizes ranging from small to moderate, and predominantly moderate. Doses typically around 30 mg per day, and effects observed across clinical and child populations. Median study duration was 56 days (8 weeks). · Dose: 30 mg per day3 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
- 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
- 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
- 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
- LowLavenderAcross 3 studies, all 3 reported beneficial effects of lavender on reducing depression symptoms, with a predominant moderate effect size. The evidence is drawn from systematic reviews and reviews, but no doses, forms, or study durations were reported consistently, limiting specificity.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
- LowL-CarnosineAcross 3 studies, 1 reported a beneficial moderate-sized effect on depression symptoms, while 2 reported neutral effects. The most-studied dose was 800 mg to 2 g per day, and the evidence primarily comes from clinical populations with major depressive disorder or schizophrenia. Effects were observed over a median duration of 49 days. · Dose: 800 mg to 2 g per day1 beneficial2 neutral3 studies