Hello,
I can not make the connection between the rectal bleeding and the vitamins as this is a bit unusual.
In any event, he needs to be evaluated by a colorectal specialist for an accurate diagnosis and appropriate treatment plan.
He may have an anal fissure, hemorrhoids, diverticular disease or colon polyp.
Here is some info, let me know if you have questions.
http://www.mayoclinic.com/health/rectal-bleeding/DG00015
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