MCP server

D Fetcher Official

com.dfetcher/vitamin-d

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Vitamin D synthesis calculator: sun position, UV, IU/min, time to dose, sunburn risk, daily window.

Working at last checkVerified publisher: dfetcher.comAbout 690 tokens per request once connected3 tools

https://dfetcher.com/mcp

At a glance

Type: MCP server
Publisher: dfetcher.com (verified by the MCP Registry)
Status: Working at last check
Tools: 3
Token cost: About 690 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http vitamin-d https://dfetcher.com/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.vitamin-d]
url = "https://dfetcher.com/mcp"

Gemini CLI

{"mcpServers":{"vitamin-d":{"httpUrl":"https://dfetcher.com/mcp"}}}

Cursor

{"mcpServers":{"vitamin-d":{"url":"https://dfetcher.com/mcp"}}}

VS Code

{"servers":{"vitamin-d":{"type":"http","url":"https://dfetcher.com/mcp"}}}

Antigravity

agy mcp add vitamin-d https://dfetcher.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"vitamin-d","server_url":"https://dfetcher.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"vitamin-d","server_url":"https://dfetcher.com/mcp"}

calculate ~455 tokens
Calculate vitamin D synthesis at a given location and time. Returns sun position, UV index, IU/min, minutes to reach the target dose, MED (sunburn threshold), the peak window, and optional 15-min day / monthly year curves. UV index uses a live satellite-driven forecast where available, with a clear-
describe_skin_types ~87 tokens
Returns the six Fitzpatrick skin types with sun-reactivity behavior and descriptive ancestry hints. Call this when the user's skin type is unknown so you can pick the closest match before calling calculate.
geocode ~148 tokens
Turn a place name, postal code, or "code, CC" string into { lat, lon, label }. Auto-detects US/CA/GB/NL/JP/BR postal patterns; ambiguous digit-only codes default to US unless the caller appends a country code (e.g. "10115, DE"). Falls back to Open-Meteo place-name search for everything else.

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TruePeptideSource
Peptide reference and exact math: reconstitution units, blends, supply, dose ranges by origin.
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Public fitness and nutrition calculators, exercise information, and evidence-based guides.
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Retired. Use com.stratalize/stratalize.

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