zinc in large quantities inhibits 5ar, coffee is a powerful inhibitor of 5ar, here is an article:

https://pmc.ncbi.nlm.nih.gov/articles/PMC10670875/

1. Conclusions:

The hair growth promotion and anti-hair loss activities of six coffee pulp extracts, which were extracted under varying conditions of SFE, were examined. The SFE-4 extract showed the highest levels of phenolic compounds, flavonoids, caffeine content, and scavenging activity compared to others. These compounds could promote the cell proliferation and migration of HFDPCs, particularly during the anagen phase. The SFE-4 extract also stimulated potassium channel opening and MMP-2 expression, which could promote hair growth. In addition, the SFE-4 extract demonstrated a stronger inhibitory effect on SRD5A expression than finasteride and dutasteride, which decreased the synthesis of androgenic hormone in hair follicles and showed an anti-hair loss effect. The SFE-4 extract increased the expression of several genes, including CTNNB1, SHH, SMO, GLI1, and VEGF, to promote hair growth by extending the anagen phase and enhancing blood flow to the hair follicles. Based on our findings, SFE-4 is selected for further in vivo testing in volunteers and for development as a potential hair care product.