My Dr. took me totally off my maintenance injections because my b12 was 1567. My iron levels were so high that he decided not to do the iron transfusion. My folate was also considerably high. He handed me a copy of my blood work and right under the b12 result it said taking high levels of biotin will alter your blood work for anemias.
WOWZA! My daughter gave me biotin to take and it is 10,000 mcg. I didn't mention it to my Dr.
Now off of it and having blood work repeated. So glad I discovered this. I was having symptoms and now I know I am not crazy!
Lauren