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reta and ghk-cu peptides peptide GHK-Cu Dosage and Protocol: A
Description
Nature Reviews Endocrinology , 19(1), 1-15

There is no hard-and-fast amount thats recommended, but upwards of 1,000 mg a day appears to be safe

Serum B12 test: This is typically the initial test of B12

Lee says, citing medspas, local clinics, and telehealth providers as potential sources

The subject of the use of BPC-157 for healing is explored here
