Drug abusers esp, if your doing chemically made drugs keep body stocked on B vitamins. Why? B vitamins are not stored in tissue, blood, or organ. B vitamins need to be replenished daily. Depletion of B vitamin green, yellow, or ghost white palor. Loss of gumline, shorted central nervous system. Fact we are naturally anemic, no not vampires, but like cute Bunnicula drinking chlorophyll from a leaf. Prevention of anemia B vitamins. I am not a Dr. info provided by The Mayo Clinic.