ghk-cu modulates how many genes Tripeptide: Copper Complex Research Applications GHK-Cu Dosage and Protocol: A
Description
Its recommended

To limit exposure to extreme temperatures that may affect this product while in transit we recommend choosing Next Day Air delivery when selecting your shipping method

generally better tolerated

Subcutaneous injection allows your body to absorb the medication slowly over several days, resulting in stable therapeutic effects

But...worth trying because they do work for some people (gambit62 has good effect from B12 nasal drops)
