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  • Ships domestically from within Canada — no customs, no border delays
  • Batch-specific certificates of analysis on every lot
  • Free shipping on Canadian orders over CA$200
  • Priced in Canadian dollars — the figure on the tile is the figure charged
Onex Peptides, Canadian research peptide supplier

Quality

Certificates of Analysis

The certificate in the box was produced from the lot in the box. That sentence is the whole argument, and it is one you can verify in about ten seconds.

What a certificate of analysis is

A certificate of analysis is the record of what an analytical laboratory measured on one specific lot of material. It is not a brochure and it is not a specification sheet. A real one is boring, specific and dated, and it names a batch.

A certificate for a peptide lot should carry, at minimum:

  • The compound name and the lot number. The lot number is the whole point — it is what ties the document to a physical batch.
  • The release specification the lot was tested against. Ours is >99% (HPLC).
  • The measured purity, with the HPLC chromatogram it was integrated from rather than the number alone.
  • An identity result — the observed mass against the theoretical mass for the declared sequence.
  • Appearance, fill and date of analysis.

How to check yours in ten seconds

  1. Read the lot number printed on the vial label.
  2. Read the lot number on the certificate that came with the parcel.
  3. Confirm they are the same string — not similar, the same.
  4. Confirm the compound and the fill on the certificate match the vial.

If the two lot numbers do not match, what you have is a representative certificate: a genuine document, from a genuine assay, of a batch that is not yours. That is the standard practice across much of this category and it is the practice this page exists to argue against.

Specification is not measurement

A product tile on this site prints >99% (HPLC)and labels it as the release specification — the bar a lot has to clear before it is sold. The measured figure for your particular lot is on the certificate. Those are two different numbers describing two different things, and a supplier that prints a measured figure on a tile is advertising a result from somebody else’s vial. More on the distinction in testing methodology.

What a certificate does not tell you

A UV-area purity figure measures the proportion of UV-absorbing material in the sample. Residual water, counter-ions from purification and residual solvent do not absorb and therefore do not appear as peaks, which means peptide content by weight is almost always lower than the purity percentage implies. This is true of every certificate in this category, not only ours, and it is worth knowing before comparing two suppliers on a decimal place.

Requesting a certificate

Email [email protected] with the lot number from the vial and we will send the certificate for that batch. If you are evaluating us before ordering and want to see what a certificate looks like first, ask — we will send a recent one with the purchaser details removed.

A published archive is not on this site yet. When one is, each certificate will be linked from the product page of the compound it belongs to, so the document is reachable from the page where the decision is made rather than only from here.