Did you have any sides, do you drink it on empty stomach?
What brand do you take? I read you have to becareful on which one you take, some of them hae added oils and are meant to put on hair and skin, I tried searching around but nobody says what brand they use and type.
Have you ever tried making Bone broth soup? you put some marrow bones in a slow cooker and low cook it for like 20 hours pour it through a strainer into a bowl put it in the cold fridge and let the fat come up to the top scrap that hardened fat off and you should be left with a collagen rich broth thats like jello texture and it melts right up when heated. Its awesome stuff you can drink it warm plane or add it to soups it really works especially when you are sick its very soothing.