b12 injection skin rash What Happens When You're Allergic to Vitamin Vitamin B12 Allergic Reaction |
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The mechanism works synergistically with other GHK-Cu effects
1 2 3 "Vitamin B12, folate, and the methionine remethylation cycle-biochemistry, pathways, and regulation" (PDF)

It goes straight into the blood, avoiding the stomach
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Oral supplements have to travel through your entire digestive system, where a lot can get in the way of proper absorption

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