I'm almost 4 months post-op and am definately losing hair. It's a good thing it got so thick with vitamins before surgery or I might be bald very soon. A friend who also had surgery a few yrs ago told me to take Biotin, Lysine, Zinc, Flax Seed Oil and mega doses of B12 for the hair loss. That's a lot to add to my already large dose of vitamins...I just started yesterday so don't have results yet but hoping it works...I'm going on a cruise in October and don't want to be bald. Oh am down 60lbs.