Hi, I have had a gastric by-pass and have lost down 206 lbs to my goal weight. I have also had 5 recon. surgeries since the by-pass. My hair has thinned enormously!...to the max. Since I have to take by-pass vits the rest of my life, I have also added 10,000 mcg of Biotin. I have read on this site that the max amount is unknown. Is it ok to add an additional 10,000 mcg at night? What types of meds interfere with or does Biotin interfere with? Is there a list I can find somewhere? Of course I am using Minoxidil daily, 5%. I appreciate any info on my embarrassing situation.