NMN (β-Nicotinamide Mononucleotide) is a compound derived from vitamin B3 and naturally found in various organisms. Once ingested, NMN is converted into NAD (Nicotinamide Adenine Dinucleotide), a coenzyme whose levels are known to decline with age.Doctor Select NMN 9000 N Plus contains 9000 mg of NMN and 4350 mg of niacinamide. This dual-use supplement—both oral and topical—supports your body's resilience against aging from the inside out.How to use:Oral Use: Take 2 capsules daily with water. Do not chew.Topical Use: Open the capsule and dissolve the contents in toner or purified water before applying to the skin.. Ingredient: -nicotinamide mononucleotide (domestically produced), starch/HPMC, niacin, calcium stearate, fine silicon oxide