A legitimate question, that i have asked myself many times as well.

there should be no reason to assume it has any effect on the body, since its only being digested into peptides/amino acids.

its not completely unthinkable that it may still have an effect, through some sort of mechanism that we are just not aware of yet (maybe a bit like BCAA's boost Protein Synthesis, despite being "just some amino acids"), however that remains yet to be proven. And until then i will not recommend taking them, since they are quite expensive.