Vitamin D and Reduced Depression Symptoms

Research synthesisLow evidenceSmall effect4 studies · 3 beneficial · 1 neutral · 0 harmful

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.

Studied populations: adolescents aged 10-19 years, elderly adults aged 65 and older

Caveats: Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). Evidence base is small (only 4 studies) — conclusions should be considered preliminary. Many included studies are reviews or observational in nature, with wide variation in assessments and small samples, limiting the certainty of the findings.

Generated Jun 11, 2026

Safety in these studies

Overall tolerabilityReported
Randomized controlled trial (RCT) findings reveal that while interventions like saffron and vitamin D show promise, significant limitations persist, including inconsistent efficacy, limited long-term safety data, and potential interactions with perinatal physiology.
from: Supplementary approaches to perinatal depression: a review of pathogenesis, herbal interve

4 of 4 papersPopulation:

From Plate to Mind: Scientific Perspectives on Foods That May Influence Anxiety and Depression.
- 2026-04-22
- Meta-Analysis
- Nutrients 18(9)
- - Antoniya Hachmeriyan
  - Gabriela Panayotova
  - Hristiyana Todorova
- PubMed: 42123920
- DOI: 10.3390/nu18091318
1 Insight on
- Reduced Depression Symptoms
- High evidence
- Rigorous Journal
Micronutrients serve as enzymatic cofactors for monoamine and GABA synthesis and modulate immune signaling; clinical effects are the most consistent when correcting insufficiency or in biomarker-defined subgroups.
Effect
Beneficial
Effect size
Small
Significant
Yes
A Recipe for Resilience: A Systematic Review of Diet and Adolescent Mental Health.
- 2025-11-24
- Systematic Review
- Nutrients 17(23)
- - Jade E Tucker
  - Anthony M Brennan
  - David Benton
  - Hayley A Young
- PubMed: 41373968
- DOI: 10.3390/nu17233677
6 Insights on
- Reduced Depression Symptoms
- High evidence
- Rigorous Journal
- Children
Examined exposures included vitamin D, omega-3s, polyphenol-rich foods, Mediterranean-style diets, and overall diet quality. Depressive symptoms were the most studied outcome... the current evidence is constrained by wide variation in assessments, small samples, and significant methodological limitations.
Effect
Neutral
Effect size
Small
Significant
No
An Observational Study on the Association Between Nutritional Intake and Mental Health Among Older Adults in Rural Areas.
- 2025-03
- Observational · n = 465
- Nursing & health sciences 27(1)
- - Kyeongmin Jang
- PubMed: 40101703
- DOI: 10.1111/nhs.70080
2 Insights on
- Reduced Depression Symptoms
- High evidence
- Elderly
Energy, protein, and fiber intake also negatively correlated with depressive symptoms, emphasizing the importance of overall nutritional balance.
Effect
Beneficial
Effect size
Small
Significant
Yes
Dose
≥ 5 mg α-TE/day
Supplementary approaches to perinatal depression: a review of pathogenesis, herbal interventions, and dietary supplements.
- 2025-05-21
- Review
- Frontiers in psychology 16
- - Quancheng Yang
  - Yi Lv
  - Shenrong Gao
  - Yu Zhang
  - Xuejia Zhai
- PubMed: 40491948
- DOI: 10.3389/fpsyg.2025.1529339
2 Insights on
- Reduced Depression Symptoms
- Low evidence
RCT findings reveal that while interventions like saffron and vitamin D show promise
Effect
Beneficial
Effect size
Small
Significant
Yes

Vitamin D and Reduced Depression Symptoms

From Plate to Mind: Scientific Perspectives on Foods That May Influence Anxiety and Depression.

A Recipe for Resilience: A Systematic Review of Diet and Adolescent Mental Health.

An Observational Study on the Association Between Nutritional Intake and Mental Health Among Older Adults in Rural Areas.

Supplementary approaches to perinatal depression: a review of pathogenesis, herbal interventions, and dietary supplements.