Protein Optimizer
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Used for: gut health and building muscle
Summary
Thorne Protein Optimizer is a probiotic.
Strengths
- Batch-tested for banned substances (NSF Certified for Sport).
Weaknesses
- Expensive at $1.40 per serving.
Why it scores 66
How scoring works →Independent analysis No brand partnerships
The details
Cross-referenced with PubMed & Examine.com
Probiotic strains can support gut health, but benefits depend on the specific strain and dose, and evidence for athletes is still developing.
Probiotic strains can support gut health, but benefits depend on the specific strain and dose, and evidence for athletes is still developing.
1 of 5 standards Pello tracks · Third-party tested for banned substances
Tested for sport
- NSF Certified for SportVerified with NSF · Oct 5, 2026 ↗
Tested for substances banned in sport, with the formula and label reviewed and the manufacturing facilities inspected.
- Informed Sport
- Cologne List
Food & sourcing
- USDA Organic
- Non-GMO Project Verified
Diet claims
- Vegan: not stated
Brand or retailer label claim, not a certification.
- Gluten-free: yes
Brand or retailer label claim. In the US a gluten-free label means under 20 ppm gluten.
- Dairy-free: yes
From the allergen list, where one is available.
Certifications are as listed on the product's page at The Feed. NSF Certified for Sport is also checked against NSF's own database. Certifications can lapse, so check the certifier's search before you rely on one, especially if you're drug tested.
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