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Endocrine Reviews
Age Older individuals may take longer to notice benefits due to decreased absorption and metabolic rates

J Pharmacol Exp Ther (2010) 333:16173.10.1124/jpet.109.161711 148 KawasLHBenoistCCHardingJWWaymanGAAbu-LailNI (2012)

Dihexa sold by research peptide vendors has variable quality

2018;36(2):e12317

Instead, go as shallow as necessary, often just under the skin in order to deliver the methyl-B12 into subcutaneous tissue
