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If you ever feel worse after a B12 injection, the cause is most likely not the B12 itself, but some troublesome excipient
The only structural difference from GHK-Cu is the first amino acid: alanine instead of glycine
If this occurs, slight dose adjustment (increasing by 50mcg if not already at 500mcg) may help
Yes, insurance doesnt cover it because it works
Vitamin absorption through the bloodstream can be more efficiently utilized by the body, whether by injection into a muscle or infusion directly into the bloodstream
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