Koskamo

Good Turn Studio Supplement Check MCP

A read-only MCP server that checks supplement labels against official upper limits, verifies halal status, compares doses to RDA, and checks for dangerous overlaps in daily stacks using NIH, NHS, and FDA data.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Good Turn Studio Supplement Check MCP logo, by Good Turn StudioCommunity listingStreamable HTTPNo sign-inEndpoint checked 2026-11-06Published by Good Turn Studio
MCP endpoint (Streamable HTTP)
https://goodturn-mcp.pages.dev/supplementcheck/mcp
Vendor documentation

What its tools do

4 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

4 of 4 have a description · 4 of 4 declare behavior hints · 4 of 4 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Check supplement label amounts and upper limit safety
  • Verify if a specific supplement brand is halal
  • Compare a specific vitamin dose against adult RDA and upper limits
  • Check for dangerous overlaps in a daily supplement stack

Source and maintenance

Community listingRegistry 1.2.0
Maintenance checked

Protocol and capabilities

Server
goodturn-supplementcheck 1.2.0
MCP protocol negotiated in check
2025-11-25
Tools
4 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": false
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

Every answer has a ready-to-read `say` line and a `note` that this is general information, not medical advice. UK users (country=GB) get NHS amounts and the Department of Health and Social Care's supplement guidance. Data: NIH Dietary Supplement Label Database, NHS vitamins and minerals guidance, NIH Office of Dietary Supplements and NCCIH fact sheets, FDA, Open Food Facts and the Halal or Not? rulebook. Every tool is read-only and nothing about the user is stored. Where an answer has a "say" field, it is a ready-to-read summary. More at https://supplementcheck.pages.dev

Tools

4 advertised

get_supplement — A supplement's label, dose check and halal status
Advertised by the server during the last successful anonymous check.
Advertised read-onlyOpen-world

A supplement's label: amounts per serving, upper limit check, halal status and a buy link. For requests like "what's in Nature Made vitamin D3?", "is Centrum halal?", "how much melatonin is in OLLY Sleep?" or "is this supplement halal?" with a barcode. Give q (brand and product name) or barcode. Returns per-serving amounts, dose_check (each vitamin and mineral compared with the adult upper limit at the most the label suggests per day, with per_day_base amounts), other_checks (melatonin, caffeine, creatine, ashwagandha and similar, including when a blend hides the amount), halal (likely_halal, doubtful, not_halal or depends_on_school, with the ingredients that need a confirmed source), alternatives (other sizes or versions), an Amazon link, and halal_options (links to halal-certified or gelatine-free versions) when the halal answer is not likely_halal. For a general name like "creatine monohydrate" it reads one common label and says so. With country=GB, dose_check uses the NHS guidance where it sets one (upper_limit says NHS guidance). Salt forms such as magnesium glycinate are counted as the mineral they hold (estimated: true), and omega-3 is read from EPA and DHA, total omega-3, or estimated from the fish oil weight.

get_supplement input schema
{
  "type": "object",
  "required": [],
  "properties": {
    "q": {
      "type": "string",
      "description": "Brand and product name, for example Nature Made vitamin D3 2000 IU."
    },
    "id": {
      "type": "integer",
      "description": "A label id from the NIH database, for example from alternatives."
    },
    "barcode": {
      "type": "string",
      "description": "UPC or EAN barcode digits (8 to 14)."
    },
    "country": {
      "type": "string",
      "description": "US, GB, IE, CA, AU. GB uses NHS guidance for the dose checks; also picks the buy link site. Default from the request."
    }
  },
  "additionalProperties": false
}
get_supplement annotations
{
  "title": "A supplement's label, dose check and halal status",
  "readOnlyHint": true,
  "openWorldHint": true,
  "idempotentHint": true,
  "destructiveHint": false
}
get_nutrient — What a vitamin, mineral or supplement does and how much adults need
Advertised by the server during the last successful anonymous check.
Advertised read-onlyOpen-world

What a vitamin, mineral or popular supplement does, how much adults need or studies used, limits, cautions and food sources. For requests like "what does magnesium glycinate do?", "what is vitamin K for?", "how much vitamin D do I need?", "is ashwagandha safe?" or "what is creatine?". Covers vitamins A, B1, B2, B5, B6, B12, C, D, E and K, niacin, folate, biotin, choline, calcium, iron, zinc, magnesium, potassium, selenium, iodine, copper, chromium, manganese, molybdenum, phosphorus, boron and omega-3, and explains common forms. Also covers creatine, melatonin, caffeine, ashwagandha, turmeric, CoQ10, collagen, protein powder, probiotics, psyllium, glucosamine, St John's wort, green tea extract, berberine, L-theanine and elderberry: for these it returns supplement, what_studies_looked_at, studied_amounts, ceiling, cautions and source instead of rda and upper_limit. Links the NIH fact sheet. With country=GB the answer gives the UK amounts and NHS supplement guidance, also in the uk field.

get_nutrient input schema
{
  "type": "object",
  "required": [
    "name"
  ],
  "properties": {
    "name": {
      "type": "string",
      "description": "A vitamin, mineral, form or supplement, for example magnesium glycinate or ashwagandha."
    },
    "country": {
      "type": "string",
      "description": "US, GB, IE, CA, AU. GB gives UK (NHS) amounts; also picks the shop link site. Default from the request."
    }
  },
  "additionalProperties": false
}
get_nutrient annotations
{
  "title": "What a vitamin, mineral or supplement does and how much adults need",
  "readOnlyHint": true,
  "openWorldHint": true,
  "idempotentHint": true,
  "destructiveHint": false
}
check_dose — Compare an amount of a vitamin or mineral with the adult RDA and upper limit
Advertised by the server during the last successful anonymous check.
Advertised read-onlyOpen-world

Compare an amount of a vitamin or mineral with the adult RDA and upper limit. For requests like "is 5000 IU of vitamin D too much?", "is 500 mg of magnesium glycinate safe?", "is 10 mg of melatonin a lot?" or "is 300 mg of caffeine too much?". Handles IU, mcg, mg and g, including IU for vitamins A, D and E and DFE for folate. For vitamins and minerals, status is above, at, within or no_upper_limit; when the name is a compound (magnesium glycinate, ferrous sulfate, zinc gluconate) the `compound` field also gives how much of the mineral the compound holds, as US and UK labels list the mineral itself; when only one reading is over the limit, the say line gives both and compared_with.depends_on_label is true. Fish oil, cod liver oil and krill oil amounts are the oil weight, so EPA plus DHA is estimated (amount.epa_dha_estimate_mg). With country=GB the limit is the NHS guidance (compared_with.reference is UK (NHS), with us_upper_limit alongside). For other supplements the answer compares with an official ceiling where one exists (caffeine) or the amounts studies have used, with status above, at, within, above_studied_range, within_studied_range, below_studied_range or no_set_amount, plus cautions. Adult values only, with a note.

check_dose input schema
{
  "type": "object",
  "required": [],
  "properties": {
    "q": {
      "type": "string",
      "description": "The whole question instead, for example 5000 IU vitamin D."
    },
    "unit": {
      "type": "string",
      "description": "IU, mcg, mg, g, mcg DFE, or billion (CFU) for probiotics. Defaults to IU for vitamin D amounts of 200 or more, otherwise the usual unit."
    },
    "amount": {
      "type": "number",
      "maximum": 10000000,
      "minimum": 0,
      "description": "The amount taken per day, in the unit given."
    },
    "country": {
      "type": "string",
      "description": "Two-letter country code. GB compares with NHS guidance and gives UK amounts. Default from the request."
    },
    "nutrient": {
      "type": "string",
      "description": "The vitamin, mineral or supplement, for example vitamin D, magnesium or melatonin."
    }
  },
  "additionalProperties": false
}
check_dose annotations
{
  "title": "Compare an amount of a vitamin or mineral with the adult RDA and upper limit",
  "readOnlyHint": true,
  "openWorldHint": true,
  "idempotentHint": true,
  "destructiveHint": false
}
check_stack — Add up everything someone takes and check the daily totals
Advertised by the server during the last successful anonymous check.
Advertised read-onlyOpen-world

Add up everything someone takes and check the daily totals against adult upper limits. For requests like "I take Centrum, vitamin D 5000 IU and zinc 50 mg, is that too much?" or "is it OK to take OLLY Sleep with extra melatonin?". Takes up to 6 items separated by semicolons: product names, barcodes, or amounts like vitamin D 5000 IU. Products are counted at the most each label suggests per day. Returns totals (each vitamin and mineral added up, with the items it comes from, compared with the adult upper limit, or NHS guidance with country=GB), other_totals (caffeine, melatonin and similar added up, or marked when a label hides the amount), items (what each was matched to) and not_found. Fish oil amounts count the EPA and DHA they typically hold.

check_stack input schema
{
  "type": "object",
  "required": [
    "items"
  ],
  "properties": {
    "items": {
      "type": "string",
      "description": "What the user takes, separated by semicolons, for example Centrum Silver Men; vitamin D 5000 IU; zinc 50 mg."
    },
    "country": {
      "type": "string",
      "description": "Two-letter country code. GB compares totals with NHS guidance. Default from the request."
    }
  },
  "additionalProperties": false
}
check_stack annotations
{
  "title": "Add up everything someone takes and check the daily totals",
  "readOnlyHint": true,
  "openWorldHint": true,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (1 of 1 answered).

  1. 2026-11-06: 1 of 1 checks answered

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
290 ms
95th percentile latency
290 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 290 ms · metadata changed · 4 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http supplement-check-mcp https://goodturn-mcp.pages.dev/supplementcheck/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add supplement-check-mcp --url https://goodturn-mcp.pages.dev/supplementcheck/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable supplement-check-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "supplement-check-mcp": {
      "url": "https://goodturn-mcp.pages.dev/supplementcheck/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "supplement-check-mcp": {
      "type": "streamableHttp",
      "url": "https://goodturn-mcp.pages.dev/supplementcheck/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start supplement-check-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "supplement-check-mcp": {
      "type": "http",
      "url": "https://goodturn-mcp.pages.dev/supplementcheck/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http supplement-check-mcp https://goodturn-mcp.pages.dev/supplementcheck/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.
Claude Desktop configuration
https://goodturn-mcp.pages.dev/supplementcheck/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "supplement-check-mcp": {
      "serverUrl": "https://goodturn-mcp.pages.dev/supplementcheck/mcp"
    }
  }
}

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