That is the only strength of Bioitin that I've heard of advertised anywhere. Hair loss happens in some people, probably most, but not in some. You'll just have to wait and see. But the biotin will help, but not prevent hair loss. For PS surgery, I'd wait a while. My surgeon and a local plastic surgeon (who specializes in WLS patients) have said to wait at least 15-18 months or when your weight has been stable at least 3 months. Surgery too soon, and the extra weight loss past surgery may not give you the best results.
Dave Chambers, 6'3" tall, 365 before RNY, 185 low, 200 currently. My profile page: product reviews, tips for your journey, hi protein snacks, hi potency delicious green tea, and personal web site.