Supplement Check

What a vitamin, mineral or popular supplement does, how much adults need and the safe upper limit (US NIH, and NHS amounts for UK users), a dose check ("is…

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What it can do

  • Get Supplement: A supplement's label: amounts per serving, upper limit check, halal status and a buy link. Use for "what's in Nature Made vitamin D3?", "is Centrum halal?", "how much melatonin is in O
  • Get Nutrient: What a vitamin, mineral or popular supplement does, how much adults need or studies used, limits, cautions and food sources. Use for "what does magnesium glycinate do?", "what is vitamin
  • Check Dose: Compare an amount of a vitamin or mineral with the adult RDA and upper limit. Use for "is 5000 IU of vitamin D too much?", "is 500 mg of magnesium glycinate safe?", "is 10 mg of melatonin

What data it sees

Do you need an account

No: the server works without sign-in

What a vitamin, mineral or popular supplement does, how much adults need and the safe upper limit (US NIH, and NHS amounts for UK users), a dose check ("is 5000 IU of vitamin D too much?"), supplement labels by name or barcode, and a check of a whole daily stack. General information, not medical advice.

Free and read-only: no sign-in, no key, and nothing about you is stored. Built by Good Turn Studio.

How to connect

How to connect Supplement Check to Claude

The server address to paste into Claude settings:

https://supplementcheck--goodturnstudio.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect Supplement Check to ChatGPT

The server address to paste into ChatGPT settings:

https://supplementcheck--goodturnstudio.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect Supplement Check to Cursor

The server address to paste into Cursor settings:

https://supplementcheck--goodturnstudio.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (4)

Raw names from tools/list. Only developers need these.

get_supplementA supplement's label: amounts per serving, upper limit check, halal status and a buy link. Use for "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_nutrientWhat a vitamin, mineral or popular supplement does, how much adults need or studies used, limits, cautions and food sources. Use for "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.
check_doseCompare an amount of a vitamin or mineral with the adult RDA and upper limit. Use for "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_stackAdd up everything someone takes and check the daily totals against adult upper limits. Use for "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?". Pass 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.