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Methylcobalamin is the most active, absorbable form of B12
J Neurochem 70:26132619 Kunnecke B, Cerdan S, Seelig J (1993) Cerebral metabolism of [1,2-13C2]glucose and [U-13C4]3-hydroxybutyrate in rat brain as detected by 13 C NMR spectroscopy
Development-dependent regulation of molecular chaperones after hypoxia-ischemia
The human tri-peptide GHK and tissue remodeling
Peptides with cysteine, methionine, tryptophan, aspartic acid (Asp), glutamine (Gln), or N-terminal glutamic acid (Glu) are less stable and should be frozen when not in use
However, the oral bioavailability of peptides specific to the hair follicle remains debated
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