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This depends on the severity of symptoms, B12 levels, and overall health
Avoid very cheap options, as high-quality peptides need advanced synthesis and testing
doi:10.1007/s10787-006-1531-7
No published trial has evaluated the four-peptide KLOW combination together
Redox state of glutathione in human plasma
We actually prefer SQ because its painless and has an established track record of effective B12 delivery, whereas IM can be painful and tends to put people off self-injecting
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