ghk cu nausea GHK-Cu Supplement Formula GHK-Cu Peptide: Benefits for Tissue
Description
Koi Peptides does that best, with independent third-party re-testing and a per-lot COA you can read before buying

Maximum AHK-CU Concentration The general consensus in peptide formulation is that 10% is the maximum concentration for topical copper peptide use

Again, cats should only be getting hairballs around 1x a month, at most
Peptide half-life is the time required for peptide concentration to decline by 50 percent within a biological system
H.O'FlahertyS.BarrangouR.TheriotC

Best choice for 30 mg vials: 3 mL creates a 10 mg/mL concentration that works well for milligram-level doses
