ghk-cu hair growth human study randomized Ingredients — Hairgenetix Hair Tonic with GHK ghk-cu hair growth clinical study
Description
Understanding Dosage Measurements Vitamin B12 shots are measured in micrograms (mcg) or milligrams (mg)

References Krivic A, et al

It is highly unlikely that you will get a reaction from the COVID vaccine which is related to your penicillin reaction

The community starts at doses equivalent to the lowest FDA titration step (0.25 mg) and increases cautiously
