---
title: "Vitamin D — Evidence & Citations | Magellan"
description: "Natural sources, dosing and cited research for Vitamin D."
url: "https://magellanlongevity.com/m/vitamind.md"
canonical: "https://magellanlongevity.com/m/vitamind.html"
html: "https://magellanlongevity.com/m/vitamind.html"
type: "molecule"
slug: "vitamind"
citations: 0
updated: 2026-08-11
author: "Gabriel Radu, DO"
author_credentials: "Physiatrist (PM&R). NY medical license 275110. NPI 1376861765."
publisher: "Magellan Longevity"
content_format: "markdown"
---

# Vitamin D

[Home](https://magellanlongevity.com/) › Molecules › Vitamin D

**HTML version:** https://magellanlongevity.com/m/vitamind.html · **In the Magellan app:** https://magellanlongevity.com/#/search/Vitamin%20D

## Where it comes from without a bottle

Food, exercise and behaviour routes to the same pathway, each with its citation.

| Natural source | How it works | Citation |
| --- | --- | --- |
| Sunlight / UVB on skin | UVB converts skin 7-dehydrocholesterol to vitamin D3 — the body's primary route. | Dermatoendocrinol 2013 [PMID 24494042](https://pubmed.ncbi.nlm.nih.gov/24494042/) |
| Fatty fish (salmon, mackerel, herring) | Fish is the major food source of vitamin D; fatty fish raises serum 25(OH)D the most. | Am J Clin Nutr 2015 [PMID 26354531](https://pubmed.ncbi.nlm.nih.gov/26354531/) |

### What those papers actually say

1. **Sunlight / UVB on skin**
   Dermatoendocrinol 2013 · [PMID 24494042](https://pubmed.ncbi.nlm.nih.gov/24494042/) · [DOI 10.4161/derm.24494](https://doi.org/10.4161/derm.24494)

   > During exposure to sunlight 7-dehydrocholesterol in the skin absorbs UV B radiation and is converted to previtamin D3 which in turn isomerizes into vitamin D3.

2. **Fatty fish (salmon, mackerel, herring)**
   Am J Clin Nutr 2015 · [PMID 26354531](https://pubmed.ncbi.nlm.nih.gov/26354531/) · [DOI 10.3945/ajcn.114.105395](https://doi.org/10.3945/ajcn.114.105395)

   > As the major food source of vitamin D, fish consumption increases concentrations of 25(OH)D.

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## Related on Magellan Longevity

- [Evidence-based longevity supplements](https://magellanlongevity.com/longevity-supplements.md)
- [Longevity research map](https://magellanlongevity.com/longevity-research-map.html)
- [Pathway universe](https://magellanlongevity.com/pathway-universe.html)

## Scope and disclosures

Educational information, not medical advice. Nothing here is intended to diagnose, treat, cure, or prevent any disease. Talk to your physician before starting any supplement or device, especially if you are pregnant, nursing, or taking medication.

Editorial firewall: evidence grades are assigned from the published research and are independent of any affiliate commission. As an Amazon Associate, Magellan Longevity earns from qualifying purchases.

Reviewed for accuracy by a board-certified physician (DO).