For BPC-157 + GHK-Cu + TB-500, component-resolved analysis, then whatever assay is appropriate to each component individually are the assay formats the published work in this area tends to use, which matters when you are deciding whether the material as supplied is fit for the experiment you have in mind
[1] Retatrutide: What the Evidence Actually Shows Retatrutides pivotal obesity dataset is a Phase 2, double-blind, randomised, placebo-controlled trial in adults with obesity (or overweight plus a weight-related condition), testing once-weekly doses up to 12 mg over 48 weeks
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However, things like the severity of a condition and how the procedure is performed can actually affect the efficacy
If you drink enough water, your kidneys remove waste smoothly and produce light-coloured urine