PDF) Effect of insulin like growth factor I treatment on serum androgens and testicular and penile size in males with Laron syndrome (primary growth hormone resistance) IGF 1 levels are significantly correlated with patient reported measures of sexual function International Journal of Impotence Research IGF 1 LR3 and Penis Enlargement: What the Evidence Actually Shows HCG supplement did not accelerate tunica albuginea remodeling to facilitate penile growth Scientific Reports