How to read a retatrutide certificate of analysis
A certificate is only useful if it is traceable to the specific vial. This page walks the fields on a real retatrutide certificate and shows what each one does and does not prove.
- Last scientific review
- September 2026
- Published by
- Pure Helix
The fields, one at a time
| Field | Example | What it tells you |
|---|---|---|
| Lot number | PH260501 | The unique batch identifier. It must match the vial label exactly. |
| Compound and fill weight | Retatrutide, 10 mg | Which material and which fill the certificate covers. |
| Assay date | 1 June 2026 | When the measurement was taken. It is a snapshot, not a guarantee going forward. |
| Method | RP-HPLC, UV 214 nm | How purity was measured. Without this the percentage is not comparable. |
| Purity result | 99.9% area | Proportion of detected, column-eluting material in the main peak. |
| Content | 11.83 mg | Quantified peptide per vial from the content assay. |
| Identity | LC-MS mass confirmation | That the observed mass matches the calculated mass for the sequence. |
| Verification code | COA8810 | Our internal reference tying the published page to the signed source document. |
How Pure Helix lot numbers are constructed
Lot identifiers follow the pattern PH + YYMM + sequence. In PH260501, PH is the Pure Helix prefix, 2605 is the year and month the lot entered testing, and 01 is a sequence number within that month — not a calendar day. Each fill weight is a separate lot: the 10, 20 and 30 mg retatrutide vials carry PH260501, PH260502 and PH260503 respectively.
Checking a certificate against a vial
- Read the lot from the vial label first, then open the matching lot page — do not work the other way round.
- Confirm the fill weight on the certificate matches the fill weight on the label.
- Confirm the assay date precedes the date you received the material.
- Open the signed source document from the lot page rather than relying on a transcribed figure.
- Record the lot number in your own notes. Any comparative result you generate is only reproducible if the exact material is traceable.
When a lot has no certificate yet
Backordered fill weights show the release flow instead of a certificate: reserved, arriving for testing, sample sent to the laboratory, independent testing, results verified, released to ship. A lot page is published only once a certificate exists for that lot, so an unpublished lot is exactly what it appears to be — untested at this point in the process.
Research use
Pure Helix supplies materials for laboratory research use only. Nothing on this page is medical advice, and none of the material described is for human or veterinary use.
Primary literature and standards
Reference materials and documentation
Related reading
- Analytical TestingHow to read a peptide certificate of analysisA certificate is a record of one sample on one date by one method. Read in that order, it is informative; read as a badge, it is nearly meaningless.
- Analytical TestingRetatrutide purity testing: how Pure Helix lots are analysedEvery retatrutide lot we release is tested by an independent laboratory for purity and identity, and the result is published as a lot-level certificate rather than as a marketing number.
- Compound ResearchRetatrutide research hubRetatrutide is a synthetic 39-residue peptide reported to engage three incretin-family receptors. This hub collects the mechanism pages, the molecular reference record and the lot documentation in one place.
- Analytical TestingHow Pure Helix analytical testing worksEvery released lot carries an independent certificate of analysis. This page explains what is measured, how each result is produced, and — just as importantly — what each measurement does not establish.