Doesn't collagen just use extra water stored in your body to make you look plumper? They use collagen in lip plumping glosses (like LipFusion) and it says that it takes water from your body and pulls it to that area to plump it up. That would also explain how your wrinkles may dissapear while using a face cream with collagen in it... So if you use it on your breasts, I can see how it would make them seem fuller, but the results wouldn't last, would they?
Skin, tendons and ligaments are made from collagen.
Breasts are held in place by skin and tendons.
So if you take a gelatin/collagen supplement it has
the correct nutrients to feed your body parts made
from collagen. Also healthy collagen holds more water
making it stronger and plumper.
So by tightening your skin and tendons it should lift
and firm your breasts and make them look more full at
the top.
Gelatine/collagen supplements are excellent for your joints
in your body especially for sports people.
It is a must, that you take it with a good quantity of vitamin C.