A long half-life of roughly 6 days makes a single weekly subcutaneous injection practical, while gradual titration keeps the protocol comfortable from the very first dose

do not reuse needles Follow proper aseptic technique : clean both the vial stopper and injection site with separate alcohol swabs and allow to dry fully Rotate injection sites (abdomen, thighs, upper arms) to reduce irritation and avoid tissue buildup Administer injections slowly and steadily , allowing a few seconds before withdrawing the needle Keep a record of dosing, timing, and injection sites to maintain consistency throughout the protocol Do not use the solution if it appears cloudy, discolored, or contains visible particles Store and handle peptides according to recommended conditions to preserve stability How This Works NAD+ functions as a key coenzyme in redox reactions and ATP production , playing an essential role in: Cellular energy metabolism Mitochondrial activity DNA repair pathways Cellular resilience and recovery Declining NAD+ levels over time have been associated with reduced cellular efficiency, which is why it remains a focus in metabolic and longevity-related research

We know that B12 recovery from bile would be a problem but this only contributes 5mcg to the picture, so I think its an open question
Absorption of crystalline B12 from fortified foods and dietary supplements is higher ranging from 55 to 74%, and unaffected by food-bound malabsorption