KLOW testing for purity?

[sunny16]

I've noticed that blends like KLOW often only show the mass of each peptide, and not the purity. Nexaph's testing group for KLOW specifically says "For this batch we will look for mass only and will not test for purity as it's not possible with peptide blends". However, I'm looking at another vendor's website (Orbitrex) and it shows a test report for KLOW that DOES include an "average purity" for the blend.

I'm strongly considering buying a kit from Nexaph since it's so much cheaper than single vials, but I'm not sure how comfortable I am without the purity testing. Anyone have thoughts on this? Another consideration would be to buy kits for each peptide separately and blend them myself, but what a pain.