Manufacturer / brand review
Tocris provides a useful PYY (3-36) example distinguishing chromatographic purity from net peptide content.
Inspected sample results
Peptide YY (3-36), catalogue 1618, batch 4, certificate printed 27 August 2025: HPLC purity 95.10%; mass spectrum consistent with structure; net peptide content 66.4%, with an amino-acid analysis table. The balance is described as counterions and residual water; TFA is the counterion.
Testing methods and purification
The inspected in-house certificate includes HPLC, mass-spectrum consistency and amino-acid analysis with net peptide content.
How often is testing performed?
One batch-specific certificate, printed August 2025, was inspected. Print date is not an analysis date or a retesting schedule.
What remains unverified
No contaminant panel or external laboratory attribution. The sample does not establish results for other products or current lots.
Catalogue snapshot
Examples from the linked source, not a complete or real-time stock list. Institutional entries describe service categories. Shipping to Cyprus is not verified.
Why this score?
Points reward evidence maturity, not measured product purity. Claim-only points are limited; unknown criteria remain zero. Full rules are available in Research guidesBusiness decision guidesour methodology.
Verification limits
Lab attribution: Tocris / Bio-Techne in-house certificate. A laboratory-hosted record, where explicitly identified, was inspected on the lab’s portal. No direct staff confirmation, blind purchase, independent sampling or full current-batch audit was performed by Peptide.cy. Absence of a recorded test is not proof of contamination.
Public claims about purification cost, manufacturing location or certifications are not treated as proof of a clean final product. An authenticated COA would still apply only to its identified sample.
Follow the evidence
Sources accessed 10 September 2026. Vendor claims and vendor-hosted reports are identified as such.
Tocris Bioscience customer reviews & ratings
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