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it does not actively kill all microbes (that would be bactericidal), but it stops them from reproducing, which is sufficient to maintain sterility in a closed multi-dose vial
EGF acts primarily on keratinocytes at the epidermal level
This is a theoretical risk, not a demonstrated one, and it should factor into who avoids this stack (see below)
We only have vitamins with a hypoallergenic and safe preservative called Benzyl Alcohol, which is found in naturally-occurring plant products
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Question: How long do the effects of a B12 shot last
