Multiple controlled trials in people have looked at NAD+ supplementation, including studies that measured actual intracellular levels before and after
It may cause symptoms related to neurological failure like loss of feeling or sensation, irregular bowel movements, sleep disorder, getting irritated, feeling depressed, memory loss, Alzheimer's disease
Representative tissue sections were processed for further histologic analysis as described before (5-7, 9-11, 42, 43)
One distinctive feature of these compounds is a 4.5% cobalt content, hence the name cobalamin" (cobalt + vitamin)
There are also cardiovascular benefits: B12 helps process the amino acid homocysteine, which when elevated can contribute to things such as stroke