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Supplement Check MCP Server

answering

Supplement Check is answering right now. Last checked 2 min ago. It exposes 4 tools. Last commit 4 Oct 2026.

Supplement labels, doses against official upper limits, and a whole-stack check for overlaps.

Uptime history 14 days of history
14 days agonow
100.0%
Uptime 24h
92 of 92 checks
4
Tools
read from the server
28 ms
Response time
average over 24h
0
Stars
last commit 4 Oct 2026

What changed 4

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 29 September 2026. No other catalogue keeps this.

29 Sep 4 tool descriptions were rewritten check_dose, check_stack, get_nutrient and 1 more

Nothing serious here today

Today is the operative word: we check Supplement Check every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

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Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 2 min ago.

run in your terminal
claude mcp add supplementcheck --transport http https://goodturn-mcp.pages.dev/supplementcheck/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "supplementcheck": {
      "url": "https://goodturn-mcp.pages.dev/supplementcheck/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.supplementcheck]
url = "https://goodturn-mcp.pages.dev/supplementcheck/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "supplementcheck": {
      "url": "https://goodturn-mcp.pages.dev/supplementcheck/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "supplementcheck": {
      "url": "https://goodturn-mcp.pages.dev/supplementcheck/mcp"
    }
  }
}

Available tools 4

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

dose
check_dose
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.
nutrient
get_nutrient
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.
stack
check_stack
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.
supplement
get_supplement
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.

Endpoints

URLTransportStateLatencyChecked
https://goodturn-mcp.pages.dev/supplementcheck/mcp streamable-http answering 26 ms 2 min ago

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Supplement Check — questions

Answers built from our own checks of this server.

What can Supplement Check do?
It exposes 4 tools, read directly from the server on our last check. Among them: check_dose, check_stack, get_nutrient, get_supplement. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Supplement Check working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 28 ms. The bar chart above shows every period we have measured.
How do I connect Supplement Check?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Supplement Check need an API key?
No. Supplement Check completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Supplement Check?
It answers our handshake in 28 ms on average, which is faster than 99% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is Supplement Check open source?
Yes — it is published under the MIT licence, written in JavaScript and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.