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And to do that all of the other delivery methods that could be used need to be thoroughly evaluated, not only as to their effectiveness in correcting the patients B12 Deficiency, but also in how the patient responds to particular delivery methods

Long R3 IGF-1, Long Arginine 3-IGF-1, LR3-IGF-1 20-30 hours (vs 12-15 minutes for native IGF-1) IGF-1 LR3 (Long R3 IGF-1) is a modified insulin-like growth factor 1 with an arginine substitution at position 3 and a 13-amino acid N-terminal extension

[4] Dimet-Wiley A, et al

Unlike other vitamins, the absorption of vitamin B12 depends on a protein produced in your stomach, called the intrinsic factor