# Supplement Check (remote · goodturn-mcp.pages.dev)

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

- Trust score: 68/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-28

## Components

- remote · `goodturn-mcp.pages.dev`: 68/100 (this document), [markdown](https://verifymcp.io/servers/goodturnstudio-supplementcheck/supplementcheck-mcp.md), [page](https://verifymcp.io/servers/goodturnstudio-supplementcheck/supplementcheck-mcp)

## Channel facts

- Endpoint: `https://goodturn-mcp.pages.dev/supplementcheck/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.2.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-28.

- **Endpoint Security**: 74/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 58/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1538 tokens (~384/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

**Unverified: 1 category.** A category scored 0 because we could not verify it: authentication we do not have, an unreachable endpoint, or not enough scan history. We only credit what we can confirm.

## Install

### How do I install the Supplement Check MCP server?

Supplement Check is a hosted endpoint at https://goodturn-mcp.pages.dev/supplementcheck/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http goodturnstudio-supplementcheck 'https://goodturn-mcp.pages.dev/supplementcheck/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "goodturnstudio-supplementcheck": {
      "url": "https://goodturn-mcp.pages.dev/supplementcheck/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "goodturnstudio-supplementcheck": {
      "type": "http",
      "url": "https://goodturn-mcp.pages.dev/supplementcheck/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.goodturnstudio-supplementcheck]
url = "https://goodturn-mcp.pages.dev/supplementcheck/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "goodturnstudio-supplementcheck": {
      "type": "remote",
      "url": "https://goodturn-mcp.pages.dev/supplementcheck/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add goodturnstudio-supplementcheck --url 'https://goodturn-mcp.pages.dev/supplementcheck/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  goodturnstudio-supplementcheck:
    url: "https://goodturn-mcp.pages.dev/supplementcheck/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "goodturnstudio-supplementcheck": {
      "Transport": "http",
      "Url": "https://goodturn-mcp.pages.dev/supplementcheck/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add goodturnstudio-supplementcheck -t streamable-http -u 'https://goodturn-mcp.pages.dev/supplementcheck/mcp'
```

### Other

```json
{
  "mcpServers": {
    "goodturnstudio-supplementcheck": {
      "type": "http",
      "url": "https://goodturn-mcp.pages.dev/supplementcheck/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-28 (score 68)

First indexed and scored.

## MCP tools (4)

### `get_supplement` (~385 tokens)

A supplement's label, dose check and halal status

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 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.

Input parameters:

- `barcode` (string): UPC or EAN barcode digits (8 to 14).
- `country` (string): US, GB, IE, CA, AU. GB uses NHS guidance for the dose checks; also picks the buy link site. Default from the request.
- `id` (integer): A label id from the NIH database, for example from alternatives.
- `q` (string): Brand and product name, for example Nature Made vitamin D3 2000 IU.

### `get_nutrient` (~335 tokens)

What a vitamin, mineral or supplement does and how much adults need

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 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.

Input parameters:

- `country` (string): US, GB, IE, CA, AU. GB gives UK (NHS) amounts; also picks the shop link site. Default from the request.
- `name` (string, required): A vitamin, mineral, form or supplement, for example magnesium glycinate or ashwagandha.

### `check_dose` (~446 tokens)

Compare an amount of a vitamin or mineral with the adult RDA and upper limit

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 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

Input parameters:

- `amount` (number): The amount taken per day, in the unit given.
- `country` (string): Two-letter country code. GB compares with NHS guidance and gives UK amounts. Default from the request.
- `nutrient` (string): The vitamin, mineral or supplement, for example vitamin D, magnesium or melatonin.
- `q` (string): The whole question instead, for example 5000 IU vitamin D.
- `unit` (string): 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.

### `check_stack` (~240 tokens)

Add up everything someone takes and check the daily totals

Add 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.

Input parameters:

- `country` (string): Two-letter country code. GB compares totals with NHS guidance. Default from the request.
- `items` (string, required): What the user takes, separated by semicolons, for example Centrum Silver Men; vitamin D 5000 IU; zinc 50 mg.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/goodturnstudio-supplementcheck/supplementcheck-mcp#diagnostics

## Score history

- 2026-09-28: 68

## Common questions

### What is the Supplement Check MCP server?

Supplement Check is an MCP server listed in the public MCP registry as io.github.GoodTurnStudio/supplementcheck. Supplement labels, doses against official upper limits, and a whole-stack check for overlaps. This page covers its hosted endpoint (https://goodturn-mcp.pages.dev/supplementcheck/mcp).

### Is the Supplement Check MCP server safe to use?

Supplement Check scores 68 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Supplement Check MCP server expose?

Supplement Check exposes 4 tools: get_supplement, get_nutrient, check_dose, check_stack. Their descriptions and schemas cost roughly 1,406 tokens of context every time the server is loaded.

### Does the Supplement Check MCP server require authentication?

No. We connected to Supplement Check without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Supplement Check MCP server still maintained?

Supplement Check is still listed as active in the MCP registry. We last reached this channel on 28 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://goodturn-mcp.pages.dev/supplementcheck/mcp
- Repository: https://github.com/GoodTurnStudio/goodturn-mcp
- Website: https://goodturn-mcp.pages.dev/supplementcheck
- Changelog RSS feed: https://verifymcp.io/servers/goodturnstudio-supplementcheck/supplementcheck-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/goodturnstudio-supplementcheck/supplementcheck-mcp.json
- HTML version of this page: https://verifymcp.io/servers/goodturnstudio-supplementcheck/supplementcheck-mcp