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Description
Detailed assay protocols are described in the Generic User Manual

doi:10.1016/s0026-0495(99)90056-2 Rubinow KB, Vaisar T, Tang C, Matsumoto AM, Heinecke JW, Page ST

Digestive issues such as Crohn's or celiac disease can lead to impaired absorption of nutrients in the gut which may result in the need for B12 supplementation
Not everyone needs every peptide, and staggered implementation helps identify the minimum effective stack

The route and dose depend on your goals and provider guidance
doi: 10.1093/ajcn/nqy072
