It's prescribed for patients with confirmed vitamin B12 deficiency, especially those who cannot absorb B12 properly from food or oral supplements
Cascinu S, Cordella L, ferro E et al
However, research in this area has not specifically included people who have had NAD+ infusions
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Look for a licensed healthcare provider (MD, DO, ND) with a background in functional medicine
Due to the lack of studies on the mechanism of MSM metabolism, further research is needed to provide a clear explanation between MSM and fecal metabolome in kittens supplemented with dietary MSM