Acne while on ghkcu?

all my life ive always had really great clear skin but ever since i got on ghkcu ive had bad acne and i got on ghkcu for the skin tightening and i know one of the pros is it clears up acne but its been the complete opposite for me. ive had this acne for a good month ish and ive been on ghkcu for around 3-3.5 months. and before you ask i got my zinc levels checked and im at 85 which 65 is when it is in red or bad low so its not too crazy. i eat VERY clean, literally no processed foods whatsoever. my skin products are very clean too im very into clean ingredients. so what am i missing, why is this happening?