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While a blood test is the definitive way to diagnose a clinical deficiency, it isnt always required to start B12 injections for general wellness purposes
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When the food is swallowed, a substance in saliva called R-protein a protein that protects B12 from being destroyed by stomach acid travels to the stomach along with the food
However, megadosing (taking excessive amounts of vitamin B12) may lead to some negative side effects
The most common vial is 50 mg GHK-Cu, 10 mg BPC-157, and 10 mg TB-500, but some run lower copper, near 27 mg