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Some NHS/ICB guidance notes oral options for dietary-related deficiency, and that long-term injection schedules depend on the cause

The age-related drop in NAD+ levels is caused by rising levels of CD38, a membrane-bound NADase that degrades both NAD+ and its precursor nicotinamide mononucleotide, according to a 2016 study in mice, which exhibit age-related declines in NAD+ levels similar to those seen in humans (7)

Underlying health conditions: Some health conditions, such as gastrointestinal disorders or liver disease, can affect B12 absorption and metabolism, potentially leading to shorter-lasting benefits from B12 injections

Step 2: Draw the water