mcg

  1. G

    GNC high potency biotin 5000 mcg?

    I want to know is this make your hair grow fast ? Its bad to take 5000 mcg??
  2. H

    does gnc biotin 2500 mcg pills react badly with doxycycl hyc 100mg?

    i take the doxycycl twice a day, for my acne and i heard that the biotin shouldnt be taken with some anti-bacterials so i was wondering if this combination was okay? not at the same time of course, but what are the side effects?
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