Understand the source comparison
US vs China Peptides: The Full Comparison Table
The table below summarizes the primary variables that distinguish the two sourcing models at the research-use tier. Typical HPLC purity 99%+ verified 95–99% (highly variable) Third-party test lab independence ISO 17025, US-accredited Variable; sometimes in-hou
No winner is assigned.
This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- The table below summarizes the primary variables that distinguish the two sourcing models at the research-use tier.
- Typical HPLC purity
- 99%+ verified
- 95–99% (highly variable)
- Third-party test lab independence
- ISO 17025, US-accredited
- Variable; sometimes in-house
- Raw material sourcing disclosure
- Common
- Rare
- Impurity profile documentation
- Itemized on COA
- Often single-number purity only
- Transit time to US lab
- 2–3 business days
- 2–5 weeks international
- FDA customs seizure risk
- Not applicable
- Documented at US ports
- Heavy metal testing standards
- USP/ICH compliance typical
- Variable
- Residual solvent testing
- Standard on cGMP-adjacent product
- Endotoxin testing
- Common, documented
- Price per mg (typical)
- Higher
- Lower at bulk tier
- Legal recourse for defects
- US state UCC + consumer law
- Cross-border enforcement only
- Customer support jurisdiction
- US business hours
- Variable time zones