These may include: Fatigue Brain fog Memory loss Neurological problems Heart palpitations Pale skin Muscle weakness Mood changes Appetite loss Constipation Infertility Side Effects of Vitamin B12 While the recommended daily amount of vitamin B12 for adults is 2.4 micrograms, higher doses have been found to be safe
Am J Nephrol 29:551557 Perticone F, Sciacqua A, Maio R, Perticone M, Maas R, Boger RH, Tripepi G, Sesti G, Zoccali C (2005) Asymmetric dimethylarginine, L-arginine, and endothelial dysfunction in essential hypertension
Peter Attia, a longevity physician, discusses NAD+ precursors: "While evidence is emerging, NAD+ boosting shows promise for mitochondrial health and longevity, though IV might not be optimalprecursors like NMN could be better."[33][20] On combinations, he cautions on long-term data but notes potential for metabolic disorders
doi:10.1016/bs.vh.2022.01.011 Kumrungsee T, Peipei Z, Yanaka N, Suda T, Kato N