For example, BPC-157 is often dosed at 2.5-4 mcg/kg, meaning a 180lb (82kg) person would take 205-328mcg
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You experience symptoms of deficiency
Parenteral (intramuscular) administration of vitamin B12 completely reverses the megaloblastic anemia and GI symptoms of vitamin B12 deficiency
Pernicious anaemia is more common in people who already have autoimmune conditions such as Crohns disease and ulcerative colitis (both types of inflammatory bowel disease)
Here is the complete breakdown