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Topical serums typically contain 1-3% GHK-Cu concentration
Yes, its generally safe to switch between multiple substitutes of Key B12 PFS 1500 mcg Injection 1 ml if they have the same salt and strength
It is a major source for methyl groups via its metabolite trimethylglycine (betaine) that participates in the S-adenosylmethionine synthesis pathways
In the end, choosing between methylcobalamin and cyanocobalamin should match your health goals and what your doctor recommends
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