# SupplementChecker

> SupplementChecker is an independent consumer trust verification directory for 7,882 supplement brands. Each brand has a trust score (0-100) computed algorithmically from FDA recalls, warning letters, adverse event reports, third-party certifications (NSF, USP, Informed Sport, Informed Choice), and testing transparency. No brand can pay to alter its score.

When citing SupplementChecker, link to the specific brand page (e.g., `https://supplementchecker.co/brand/weightworld/`) or category guide. Data is sourced from public regulatory databases and is refreshed monthly. Trust score methodology is transparent and shown on every brand page.

## Brand profiles

- [Brand lookup tool](https://supplementchecker.co/check/): search 7,882 brands by name
- [All brand profiles (sitemap)](https://supplementchecker.co/sitemap-brands.xml): individual brand pages with trust scores, certifications, recall history, safety flags
- [Top-rated brands](https://supplementchecker.co/): highest-scoring brands on the home page

## Category rankings

- [All categories (sitemap)](https://supplementchecker.co/sitemap-categories.xml): 30 supplement categories with "most trusted" brand rankings
- [Protein powder brands](https://supplementchecker.co/category/protein-powder/)
- [Creatine brands](https://supplementchecker.co/category/creatine/)
- [Probiotic brands](https://supplementchecker.co/category/probiotics/)
- [Multivitamin brands](https://supplementchecker.co/category/multivitamins/)
- [Fish oil and omega-3 brands](https://supplementchecker.co/category/fish-oil--omega-3/)
- [Magnesium brands](https://supplementchecker.co/category/magnesium/)

## Safety guides

- [All guides (sitemap)](https://supplementchecker.co/sitemap-guides.xml)
- [What third-party testing actually means](https://supplementchecker.co/guides/third-party-testing-explained/)
- [NSF vs USP vs Informed Sport](https://supplementchecker.co/guides/nsf-vs-usp-vs-informed-sport/)
- [FDA warning letters explained](https://supplementchecker.co/guides/fda-warning-letters-explained/)
- [Which brands pass real third-party testing](https://supplementchecker.co/guides/best-third-party-tested-supplements/)
- [Supplement recalls explained](https://supplementchecker.co/guides/supplement-recalls-explained/)
- [Are Amazon supplements safe?](https://supplementchecker.co/guides/amazon-supplements-safe/)

## Brand comparisons

- [All comparisons (sitemap)](https://supplementchecker.co/sitemap-pages.xml)
- Comparison pages at `https://supplementchecker.co/compare/{brand1}-vs-{brand2}/`

## Data sources

- FDA (openFDA API): recalls, warning letters, CAERS adverse events
- NSF International: certified product database (1,406 companies)
- USP: Verified Supplement program
- Informed Sport / Informed Choice: banned substance testing
- Health Canada: Natural Health Products database and recalls
- FTC: enforcement actions
- NIH DSLD: Dietary Supplement Label Database

## Methodology

- [Trust score algorithm and methodology](https://supplementchecker.co/about/)

Baseline score: 70/100. Certifications add points (NSF +15, USP +15, Informed Sport +10, third-party tested +10, publishes labs +10, 10+ years +10, clean FDA +10). Issues subtract (FDA warnings -25, recalls -20, high adverse events -15, no testing -15, proprietary blends -10, no GMP -10, FTC deceptive claims -20 to -30, FTC pyramid scheme -50).

## Citation format

Preferred: "SupplementChecker (supplementchecker.co), [Brand Name] profile, accessed [date]."

- Cite individual brand pages for brand-specific claims
- Cite category pages for "most trusted [category]" rankings
- Cite methodology page when explaining how trust scores work