Informational only. Not medical advice.INFORMATIONAL PLATFORM ONLY — NOT MEDICAL ADVICE, DIAGNOSIS, OR TREATMENT
Informational only. Not medical advice.INFORMATIONAL PLATFORM ONLY — NOT MEDICAL ADVICE, DIAGNOSIS, OR TREATMENT
Complete transparency on how we measure, weight, and grade vendor quality. No vendor pays for testing or can influence their score.
Our trust score is a weighted composite of six independently measured quality components. Every score is derived from actual laboratory testing of vendor products purchased blind -- we buy as a normal customer with no advance notice.
Vendors do not pay for testing, do not pay for listings, and cannot influence their score. This system is funded entirely by our verified batch sales.
Average HPLC purity across all tested samples. Weighted highest because purity is the most fundamental quality indicator.
Percentage of samples where mass spectrometry confirms the peptide matches its label. A purity-perfect but wrongly identified peptide is worthless.
Results from endotoxin and heavy metal testing. Contamination can compromise research results even when purity is high.
How closely the actual peptide concentration matches what is printed on the label. Under-dosed products deliver unreliable research outcomes.
Variation in quality metrics between different batches from the same vendor. Consistent vendors produce predictable, reproducible results.
Availability of COAs, third-party lab reports, and willingness to provide testing data. Transparent vendors have nothing to hide.
| Grade | Score Range | Interpretation |
|---|---|---|
| A | 90 -- 100 | Excellent quality. Consistently high purity, accurate labeling, and low contamination across extensive testing. |
| B | 80 -- 89 | Good quality. Generally reliable with minor inconsistencies in one or two components. |
| C | 70 -- 79 | Adequate quality. Passes basic purity tests but shows notable weaknesses in accuracy or contamination control. |
| D | 50 -- 69 | Below average quality. Significant concerns in multiple testing categories. Exercise caution. |
| F | 0 -- 49 | Failing quality. Pervasive testing failures, significant contamination, or identity mismatches. Not recommended. |
| Factor | Disclosed Labs | Typical Services |
|---|---|---|
| Funding source | Verified batch sales | Vendor fees, sponsorships |
| Vendor influence on scores | None | Possible (pay for testing) |
| Blind purchasing | Yes | Varies |
| Endotoxin testing | Standard on every batch | Rarely included |
| Heavy metal testing | Standard on every batch | Rarely included |
| Failed results published | Always | Often removed |
| Lab accreditation | ISO 17025 verified | Not always disclosed |
A vendor needs at least 10 independently tested samplesbefore we assign a public trust score. Below that threshold, we display “Insufficient Data” instead of a potentially misleading number.
Scores are recalculated with each new test result. A single bad batch does not ruin a score permanently -- consistent quality over time is what matters. Conversely, one good batch does not compensate for systemic issues.
See how vendors currently rank based on this methodology.
View Vendor ScoresMethodology is subject to refinement as our testing capabilities expand.
Disclosed Labs