Vitamin D Explorer
About
Whether the sun where you are can actually make vitamin D right now, for your skin type — from real solar geometry and live UV data.
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- javimaligno
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Setup
Install Vitamin D Explorer in your MCP client (Claude Desktop, Cursor, Windsurf, and others).
Repository: https://github.com/javimaligno/vitamind-mcp
Follow the installation instructions in the repository README, then restart your MCP client.
Connect your AI assistant toVitamin D Explorer— so it can answer, for your actual location and skin type, whether the sun can make vitamin D right now, how long you'd need, and which months of the year it's possible at all.
Generic advice says "get 15 minutes of sun". That answer is wrong most of the time: skin type I in London and skin type V in Madrid need completely different exposure, and above about 40° latitude there are months where synthesis is physically impossible no matter how long you stay out.
"I'm in Vilnius, skin type II. Can I make vitamin D today?"
"Which months of the year can I get vitamin D in London?"
"I was out 25 minutes at noon in Madrid, arms and legs bare — how much did I make?"
"When's golden hour in Lisbon on Friday?"
Most clients can connect to the hosted server directly, withno install at all— seegetvitamind.app/connectfor per-client steps. Use this package when your client only launches local commands.
{ "mcpServers": { "vitamind": { "command": "npx", "args": ["-y", "vitamind-mcp"] } } }
That's the whole configuration. No API key, no account.
npx mcp-remote https://getvitamind.app/api/mcp-auth/mcp
Not a lookup table. Every answer is computed from:
- Solar geometry— NOAA declination and elevation formulas.
- UV model— Madronich (2007) clear-sky UVI with van Heuklon ozone by latitude, longitude and season, plus an altitude correction (~8% per km — enough to change which months work for a city like Bogotá).
- Vitamin D synthesis— Holick & Dowdy (2010), with MED by Fitzpatrick skin type (I-VI) and the Holick (1989) age factor. Sessions saturate: past roughly ⅓ MED you gain little and burn risk rises, and the tools say so.
- Live weather— Open-Meteo UV index and cloud cover.
Threshold for any synthesis at all:UV index ≥ 3. Below that the answer is honestly "not today, consider supplementing" rather than a smaller number.
A stdio↔HTTP relay, and nothing more. It forwards JSON-RPC messages verbatim between your client and the hosted server, so new tools appear without a release here.All the vitamin D logic lives in the hosted server— deliberately, since a second copy of the model in this package would drift from the app that people actually use.
Estimates for healthy skin under clear-sky or forecast conditions. They ignore aerosols, ground reflectance, sunscreen and individual variation, and they are not a substitute for advice from a professional. Do not use them to plan an intentional burn.
- App:getvitamind.app
- Setup guide:getvitamind.app/connect
- Main repository:JaviMaligno/vitamind
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