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2000 Sep-Dec;22(5-6):384-92
This suggests that absorption or metabolic utilisation of B12 may differ in some South Asian individuals (Refsum et al., 2001, AJCN)
But nasal administration offers clear advantages for researchers who want ease and comfort: Easy and Painless : No needles
On your time
JPT's peptide stability guidance makes the same broad distinction: lyophilized peptides can remain stable for months to years when stored properly, while reconstituted materials require tighter handling
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