PeptidesCheck.Source file upload
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Upload a certificate or paste raw text, then click Check certificate to begin.
PeptidesCheck.
Read a peptide Certificate of Analysis (COA) and see, field by field, what the document actually reports, what it leaves out, and whether it can be trusted.
Independent and community-supported. No login, and no personal data stored.
Method
What we check.
Purity claim versus method
Whether the stated method (for example reverse-phase high-performance liquid chromatography) actually supports the reported purity number, and whether wavelength and integration details are present.
Sequence, mass, and batch consistency
Cross-check the peptide sequence, the reported molecular mass, and the batch identity against one another for internal consistency.
Sterility and endotoxin testing
Whether sterility and bacterial endotoxin testing is present or missing. Missing is a red flag for anything intended to be injected.
Identity and impurities
Identity confirmation (for example by mass spectrometry) and the presence of counted impurities, residual solvents, and elemental impurities.
Signs of reuse or tampering
Duplicate hashes, reused batch identifiers with different content, and templated or obviously edited documents surface through the Authenticity Register.
Honest gaps
Fields the certificate simply does not report are shown as such, not silently passed.
How it works
How the tool actually reads a certificate.
- 1Read the document
An artificial intelligence (AI) reader extracts structured fields from the uploaded image, Portable Document Format (PDF), or pasted text. This step is heuristic.
- 2Score with rules
Extracted fields are scored deterministically. Purity thresholds, missing safety tests, and internal inconsistencies are rule-based, not AI opinions.
- 3Hash and cross-reference
The exact submitted content is hashed with the Secure Hash Algorithm 256-bit (SHA-256) in your browser and cross-referenced against the append-only Authenticity Register to detect duplicates and reuse.
- 4Return a plain-language verdict
You get a per-field breakdown, a one-sentence overall summary with caveats, and a shareable verification link if the certificate is registered.
Authenticity Register
Every check leaves a durable trace.
Each certificate is hashed with SHA-256 and recorded in an append-only register. Entries cannot be edited or deleted. That lets the tool detect the same certificate being reused for a different batch, or the same batch identifier arriving with different content, which a single document reading cannot catch.
Honest limits
What a certificate review can and cannot tell you.
A document review checks the paper, not the vial. A genuine-looking certificate can still accompany an adulterated product.
Purity is not safety. Most certificates never test sterility or bacterial endotoxins, which are the parts that make an injectable dangerous.
For anything intended to go near a person, independent laboratory testing of the actual material is required. This tool does not replace it.
Audience
Who this is for.
Researchers
Clinics
Compounders
Distributors
Buyers
Next step
Submit a batch for independent laboratory testing, or support the work. Both keep the tool independent.
Trust and independence
Who runs this, and how it stays independent.
PeptidesCheck is run by Descier Science and is independent and community-supported.