America's Compounding Center says the following about NADH:
"NADH, which stands for nicotinamide adenine dinucleotide hydrate, is a naturally occurring chemical related to B vitamins that helps the body produce energy necessary for normal cell function. NADH supplements have ben used to enhance immune system function, increase energy levels, improve athletic performance, decrease blood pressure and cholesterol levels, improve nerve function in patients with Parkinson's disease, decrease the side effects of some medications used to treat human immunodeficiency virus (HIV) infection, and for conditions such as mitochondrial disease that may result in NADH deficiency. Patients typically take between 2.5 and 10 mg of NADH by mouth daily. Side effects reported with NADH supplementation are minimal and include insomnia and anxiety."