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Show your sourcesEmerging evidenceReviewed May 2026

Vitamin D3 supplementation improves mood and depressive symptoms, the receipts.

Real but conditional: clear benefit in deficient individuals, limited benefit in non-deficient ones.

4 of 4 matching studies surfaced. NutriStack rating: emerging evidence. Last reviewed May 26, 2026.

How we tier evidence →Browse all claim deep dives

Emerging evidence, per the methodology. Strongest 4 studies linked to PubMed.
Recommendation, contrary evidence, and dose are all on this page.

The studies·Contrary evidence·Recommendation

The studies

Strongest evidence, sourced.

Sorted by study tier (meta-analyses first, then RCTs, then reviews) and recency. Every entry links to PubMed by PMID.

At a glance

Substances
Vitamin D3
Evidence tier
Emerging evidence
Strongest studies surfaced
4 of 4 matching
One-line verdict
Conditional. Replete people are unlikely to feel a difference.
Last verified
May 30, 2026

Top 4 studies

  1. RCT Putranto R, Setiati S, Nasrun MW et al., Narra J 2024

    Effects of cholecalciferol supplementation on depressive symptoms, C-peptide, serotonin, and neurotrophin-3 in type 2 diabetes mellitus: A double-blind, randomized, placebo-controlled trial PMID 39816051

  2. RCT Okereke OI et al., JAMA 2020

    Effect of Long-term Vitamin D3 Supplementation vs Placebo on Risk of Depression or Clinically Relevant Depressive Symptoms and on Change in Mood Scores: A Randomized Clinical Trial PMID 32749491

    Among 18,353 adults aged 50+, vitamin D3 vs placebo did not result in statistically significant difference in incidence of depression or mood score changes over 5.3 years

  3. RCT Penckofer S, Byrn M, Adams W et al., J Diabetes Res 2017 · n=46

    Vitamin D supplementation improves mood in women with type 2 diabetes PMID 28465792

    Significant improvement in depression symptoms with weekly vitamin D supplementation

  4. Meta-analysis Cheng YC et al., Crit Rev Food Sci Nutr 2022

    The effect of vitamin D supplementation on depressive symptoms in adults: A systematic review and meta-analysis of randomized controlled trials PMID 35816192

    Vitamin D supplementation reduced depressive symptoms more in those with existing depression (SMD: -0.57) than in the general population

Contrary evidence

What pushes back.

Caveats, null findings, and methodological limits that hold the tier where it is.

What argues against the claim

  • Large trials (VITAL, D-Health) found no effect on depression in unselected adults.
  • Effect is confounded by sun exposure, BMI, and underlying mental health.

Recommendation

What the evidence supports.

What we recommend, with caveats

If your 25-OH-D is below 20 ng/mL and you have mood symptoms, correcting the deficiency is reasonable. Routine high-dose supplementation in non-deficient adults does not consistently lift mood.

Tier criteria are documented at /methodology/evidence-tiers. Sourcing standards at /methodology/interactions.

Stack interaction risks

Where these substances clash.

Documented pairings involving the substances behind this claim. Cautions and conflicts come first.

Pairs in the database

Open the free interaction checker at /interactions to scan a full routine.

Before you go

One claim, opened up. NutriStack does this for every claim in the database.

The full library lives at /research. Every entry follows the same shape: the verdict, the studies, the contrary evidence, the recommendation, and the primary literature.

Browse all claim deep dives →Read the methodology

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