Adherence
Consumers can verify supplement quality and safety by seeking products that undergo third-party testing (e.g., NSF, Informed Choice) and adhere to Good Manufacturing Practices (cGMPs).
To ensure you are getting what is on the label and avoiding banned substances, look for third-party testing seals like NSF International or Informed Choice. These organizations test products for purity and adherence to Good Manufacturing Practices (cGMPs). You can also request certificates of analysis from manufacturers to verify quality.
Some companies also submit their products for independent testing by third-party companies to certify that their products meet label claims and that the product is free of various banned ingredients. For example, the certification service offered by NSF International includes product testing, GMP inspections, ongoing monitoring and use of the NSF Mark indicating products comply with inspection standards
Why this rating
The paper describes the existence and function of these testing programs as a means to ensure safety.
Source
ISSN exercise & sports nutrition review update: research & recommendations
Chad M. Kerksick et al. · Journal of the International Society of Sports Nutrition · 2018
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