Sources
| Publisher | Title / URL | Retrieved |
|---|---|---|
| U.S. FDA | Questions and Answers on Dietary Supplements https://www.fda.gov/food/information-consumers-using-dietary-supplements/questions-and-answers-dietary-supplements | 2026-10-27 |
| U.S. FDA | Avoiding Products Contaminated with Hidden Ingredients https://www.fda.gov/drugs/medication-health-fraud/avoiding-products-contaminated-hidden-ingredients | 2026-10-27 |
| U.S. FDA | Health Fraud Product Database https://www.fda.gov/consumers/health-fraud-scams/health-fraud-product-database | 2026-10-27 |
| U.S. FDA | Lead in Food and Foodwares https://www.fda.gov/food/environmental-contaminants-food/lead-food-and-foodwares | 2026-10-27 |
| NIH Office of Dietary Supplements | Dietary Supplements: What You Need to Know https://ods.od.nih.gov/factsheets/WYNTK-Consumer/ | 2026-10-27 |
| eCFR (U.S. Code of Federal Regulations) | 21 CFR Part 111: cGMP for Dietary Supplements https://www.ecfr.gov/current/title-21/chapter-I/subchapter-B/part-111 | 2026-10-27 |
| Bandara et al., Toxicology Reports (2020), via PubMed Central | A human health risk assessment of heavy metal ingestion among consumers of protein powder supplements https://pmc.ncbi.nlm.nih.gov/articles/PMC7509468/ | 2026-10-27 |
| Horváth et al. (2025), via PubMed Central | Analysis of heavy metal content in protein powders available on the Hungarian market https://pmc.ncbi.nlm.nih.gov/articles/PMC12286494/ | 2026-10-27 |
| U.S. Anti-Doping Agency (USADA) | Supplement Connect https://www.usada.org/athletes/substances/supplement-connect/ | 2026-10-27 |
| NSF | About Certified for Sport https://www.nsfsport.com/about-us/ | 2026-10-27 |
| NSF | Certified for Sport Program https://www.nsf.org/consumer-resources/articles/certified-for-sport-program | 2026-10-27 |
| NSF | Certified Products Search https://www.nsfsport.com/certified-products/ | 2026-10-27 |
| USP | USP Verified Mark https://www.usp.org/verification-services/verified-mark | 2026-10-27 |
| USP | Dietary Supplement Verification Program manual for participants https://www.usp.org/sites/default/files/usp/document/our-work/DS/dsvp-manual-participants.pdf | 2026-10-27 |
| Informed Sport (LGC) | Frequently Asked Questions https://sport.wetestyoutrust.com/about/frequently-asked-questions | 2026-10-27 |
| Informed Choice (LGC) | The 4 Steps to Informed Choice Certification https://choice.wetestyoutrust.com/news/4-steps-informed-choice-certification | 2026-10-27 |
| BSCG | Third-party Certified Supplement Products database https://www.bscg.org/certified-drug-free-database | 2026-10-27 |
| BSCG | Certified Drug Free Certification Process https://www.bscg.org/certified-drug-free-supplement-certification-process | 2026-10-27 |
| BSCG | Marketing & Seal Guidelines https://www.bscg.org/assets/images/bscg-certified-drug-free-marketing-seal-guidelines.pdf | 2026-10-27 |
| ConsumerLab.com | Quality Certification Program https://www.consumerlab.com/quality-certification-program/ | 2026-10-27 |