We Independently Tested 20 Peptide Samples. Here’s What We Found.
Six months, three laboratories, and 20 anonymously purchased samples from 12 companies. Purity ranged from 61% to 99.2% — and two products failed verification entirely.
Special ReportSterling Compound Co.
Mixed testing history; customer-service scores declined in the 2026 review cycle.
This company is under active review. See the testing history below.
Tests2
Score updatedJul 18, 2026
Methodologyv2.3
Movement -4down 4 points
Score Breakdown
Seven weighted dimensions, methodology v2.3. How weights work →
- Testing & Quality 25% 64
- Transparency 18% 66
- Manufacturing & Sourcing 15% 70
- Customer Experience 12% 62
- Shipping & Fulfillment 12% 76
- Policies & Returns 8% 68
- Community Feedback 10% 70
Score History
Historical Index Score™ snapshots. Scores are versioned and never overwritten.
Editorial Assessment
Sterling Compound Co. has an inconsistent record: two strong purity results, one significant quantity shortfall, and declining support responsiveness. Multiple unresolved consumer reports remain open. We recommend reviewing the full testing history before evaluating this company.
- Shipping & fulfillment
- Standard dispatch times; packaging adequate.
- Policies & returns
- Store-credit-only policy.
- Testing record
- 3 independent tests. One quantity shortfall of 14% vs. label.
Independent Testing History
Testing databaseRelated Reporting
Semaglutide content verification: 2026 mid-year testing summary
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Lab InsightsCommunity testing patterns: what 400 user reports tell us about fulfillment
Aggregated consumer reports show delivery times improving — and two companies driving most complaints.
CommunityCommunity Discussions
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