Blended products — a single vial marketed as containing several named peptides together, often at a combined dose lower than each compound’s individual listing — have become increasingly common. They raise a verification problem that single-compound products don’t.
Why Blends Are Harder to Verify
A COA testing for multiple compounds in one sample needs a method capable of distinguishing and quantifying each one separately; a simpler single-compound purity test, run on a blend, can miss whether one of the claimed ingredients is present at all, or at the claimed ratio.
“Confirming a compound is present and confirming it’s present at the stated ratio are two different tests. A lot of blend COAs only do the first.”
— an analytical chemist who reviews multi-compound testing methodsThe Ratio Problem
Even when a blend’s COA confirms all named compounds are present, it may not confirm they’re present at the advertised ratio to one another — a different and more demanding testing question than simple presence.
A Reasonable Standard to Ask For
A blend’s COA should ideally show a quantified amount for each named compound individually, from a method validated for mixtures — not just a combined purity figure or a test that only checked for one ingredient.