“IGF-1 was able to cause AR activation, inducing a five-fold increase in PSA levels in LNCaP cells cultured in serum-free medium” (MH Eileen Tan, Jun Li, H Eric Xu, Karsten Melcher, and Eu-leong Yong, Androgen receptor: structure, role in prostate cancer and drug discovery https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4571323/)
If applying Guna Igf1 4CH on the penis?