I had Roux-en-Y surgery Nov 2, 2022 and about a month ago I started losing LOTS of hair but that is about on course for me. It happens about 4 months after ever surgery or if I run a fever of 104. I’’be added a Bariatric Fusion vitamin (purchased on Amazon) specifically made for hair, nails and the like. You can also add biotin to your diet. And what they say is true - my hair has always come back after a few months. Im just so glad au have very thick hair. (at least I did pre-surgery)