What effect will testosterone supplements have on penis size?

Testosterone: Most likely no effect what so ever on a mature adult male.

Here are some ...: Beware of one of the side effects of from using testosterone - shrinking testes. So, do take any pill of testosterone supplements without knowing their ingredients. Before taking them, make sure of being evaluated to decide if you really need T-supplement. As to penile size, its use will not increase penile length or girth since the physical growth is controlled by genetic code & stops after adult