Verbatim response from Claude
How to Evaluate Protein Powder Quality & Safety
Look for Third-Party Testing Certifications
These are the most important indicators of safety and accuracy:
- NSF Certified for Sport - rigorous testing, popular with athletes
- Informed Sport/Informed Choice - tests for banned substances
- USP Verified - checks purity and label accuracy
- Labdoor - independently tests and grades supplements
Check the Label Carefully
- Protein per serving vs. serving size - should be a high ratio
- Watch for "amino spiking" - cheap amino acids (glycine, taurine) artificially inflate protein numbers
- Short, recognizable ingredient list is generally better
- Avoid proprietary blends that hide individual amounts
Recommended Trustworthy Brands
- Optimum Nutrition Gold Standard - widely tested, consistent quality
- Thorne - pharmaceutical-grade standards, NSF certified
- Garden of Life - good for plant-based, third-party certified
- Momentous - NSF certified, popular with professional athletes
- Transparent Labs - clean labels, no artificial fillers
Red Flags to Avoid
- No third-party certification
- Unrealistic claims
- Very cheap prices with no certification
- Heavy metal concerns (some plant proteins - check Labdoor reports)
Bottom line: The certification label is your strongest guarantee of what's actually in the product.