What a blend is, and what its certificate should say

A blend is not a compound. It is two or more separate peptides dried into the same vial, and almost everything that makes a certificate meaningful gets more complicated when you do that.

A purity figure for a mixture is not a number

Purity means the fraction of the material that is the thing you wanted. In a vial containing two peptides, both are the thing you wanted, and a single figure covering both tells you nothing about either. A blend certificate should report each component separately, with its own peak and its own percentage.

The weights have to be separate too

A vial described as 10/10 mg should say which ten is which. Twenty milligrams of one pair of peptides is a different product from twenty milligrams of another, and the only way to know which you have is a certificate that breaks it out. Where one component is CJC-1295, which version is in the vial is a question of its own, with DAC or without.

Why blends exist

Mostly manufacturing and price: one fill, one lot, one shipment. A four-peptide blend is four peptides that would otherwise be four vials and four separate lots.

What you give up

• The proportions are set at manufacture, so the certificate has to state each component's mass.
• One component degrading takes the vial with it, and they do not degrade at the same rate.
• A single lot number now covers several different syntheses, so a problem with one component is invisible in the lot as a whole.

Common questions

What is a peptide blend?

It is two or more separate peptides dried into the same vial. A blend is not a compound, and it is not a set either: a set is several vials packed together, each with its own lot record, while a blend is several peptides in one vial under one lot number.

Why does a peptide blend need a purity figure for each component?

It needs one because purity means the fraction of the material that is the thing you wanted, and in a blend every component is wanted. A single figure covering all of them says nothing about any one. A blend certificate should report each component separately, with its own peak and its own percentage.

What does 10/10 mg mean on a blend vial?

It gives the mass of each of two components, and the certificate should say which ten is which. Twenty milligrams of one pair of peptides is a different product from twenty milligrams of another, and only a certificate that breaks the masses out shows which one is in the vial.

What are the trade-offs of a blend compared with separate vials?

There are three. The proportions are set at manufacture, one component degrading takes the vial with it and the components do not degrade at the same rate, and a single lot number covers several different syntheses, so a problem with one component is invisible in the lot as a whole.