Best Supplements for Reduced Depression Symptoms
Ranked by research evidence. Compare 32 supplements across 42 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, 4 reported beneficial effects of Lactobacillus helveticus Rosell-52 on reducing depression symptoms, with 2 statistically significant findings. The predominant effect size was moderate, as indicated by a 2025 meta-analysis reporting a significant moderate effect (SMD, -0.55; 95% CI, -1.04 to -0.06). Evidence was derived primarily from reviews and one meta-analysis, with no specific dose range consistently reported.
- Low evidence3 studies
Across 3 studies (2 reviews and 1 meta-analysis of RCTs), 3 reported beneficial moderate-sized effects of Bifidobacterium bifidum Rosell-71 on reducing depressive symptoms. Two findings were statistically significant, including a meta-analysis showing a moderate effect (SMD -0.55; 95% CI -1.04 to -0.06; p=0.03). Doses, forms, and study durations were not consistently reported, limiting dose-specific conclusions.
- Low evidence3 studies
Across 3 studies, all reported beneficial effects of Bifidobacterium plantarum interventions on reduced depression symptoms, with moderate effect sizes. Two of the three studies found statistically significant results, including a meta-analysis (SMD -0.55, p=0.03) and a review reporting significant reductions on the HAM-D scale. Evidence is predominantly from systematic reviews and meta-analyses of multi-species probiotic formulations in adults and adolescents with or without mood disturbances; dose ranges and study durations were not consistently reported.
- LowLactobacillus helveticus Rosell-52Across 4 studies, 4 reported beneficial effects of Lactobacillus helveticus Rosell-52 on reducing depression symptoms, with 2 statistically significant findings. The predominant effect size was moderate, as indicated by a 2025 meta-analysis reporting a significant moderate effect (SMD, -0.55; 95% CI, -1.04 to -0.06). Evidence was derived primarily from reviews and one meta-analysis, with no specific dose range consistently reported.4 beneficial4 studies
- LowBifidobacterium bifidum Rosell-71Across 3 studies (2 reviews and 1 meta-analysis of RCTs), 3 reported beneficial moderate-sized effects of Bifidobacterium bifidum Rosell-71 on reducing depressive symptoms. Two findings were statistically significant, including a meta-analysis showing a moderate effect (SMD -0.55; 95% CI -1.04 to -0.06; p=0.03). Doses, forms, and study durations were not consistently reported, limiting dose-specific conclusions.3 beneficial3 studies
- LowBifidobacterium plantarumAcross 3 studies, all reported beneficial effects of Bifidobacterium plantarum interventions on reduced depression symptoms, with moderate effect sizes. Two of the three studies found statistically significant results, including a meta-analysis (SMD -0.55, p=0.03) and a review reporting significant reductions on the HAM-D scale. Evidence is predominantly from systematic reviews and meta-analyses of multi-species probiotic formulations in adults and adolescents with or without mood disturbances; dose ranges and study durations were not consistently reported.3 beneficial3 studies