NAD+ is involved in: Energy production within cells Mitochondrial function Cellular repair and stability Metabolic signaling pathways Because of its central role in how the body functions, researchers are increasingly focused on how supporting this pathway may influence metabolism and body composition
23 Supplementation of 1 mg daily is recommended for patients with specific risk factors (e.g., bariatric/gastric surgery patients, those with severe malnutrition, chronic alcohol use, chronic hemolytic anemia and conditions with high cell turnover, and use of antimetabolite medications such as methotrexate)
(PubMed) Vacek TP, Kalani A, Voor MJ, Tyagi SC, Tyagi N
Injections usually require a prescription, while oral supplements are often available over the counter
Choosing between them is not as simple as picking the one with better results on paper