[Product question]Drinking collagen is just another marketing scam right?

Beauty Tips For Body Care
From my short research seems that drinking collagen isn't proven at all to even remotely help collagen in the skin.There is only indirect benefit since it's broken down to amino acids, but then it's much more efficient (and cheaper) to just take amino acids.Are there any recent, legit researches that prove drinking collagen helps the skin directly?
Girls Blog 2015
Submitted by TheCurious0ne