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Delivered through intramuscular injection, NAD+ bypasses the digestive system and is absorbed directly through the muscle

Knezevic et al., 2021b) or centrally (Gojkovic et al., 2021a) and both peripherally and centrally (Gojkovic et al., 2021b

Also in 2012, Dr

You can also find vitamin D in some foods such as salmon, sardines, mushrooms, and fortified milk

If I understand rightly you haven't an absorption problem.So once on supplements or a richer B12 diet you can store and utilise b12 from your liver

For confirmed deficiency with neurological symptoms , intramuscular cyanocobalamin injections are preferred, typically administered as 1000 mcg daily for one week, then weekly for four weeks, followed by monthly maintenance therapy