simple peptides bpc 157 tb 500 and TB500 Peptide Recovery Patch - Transdermal
Description
This process doesnt require intrinsic factor, but it is very inefficientonly about 1% of the B12 you swallow is absorbed this way [7]

Shipton MJ, Thachil J

any in-vivo experimentation by qualified researchers under appropriate ethics approval is the responsibility of the institution and the principal investigator

Head-to-head comparisons between arginate and acetate forms in controlled human studies would quantify the bioavailability advantage in clinical terms