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Tru Niagen also offers an immunity support supplement called Tru Niagen Immune that combines a 150mg dose of NR with vitamins D and C, zinc, and a curcumin derivative that may be more bioavailable than typical curcumin supplements

[3] Other common adverse effects reported during the clinical trials include back pain, upper respiratory tract infections, melanocyte naevus, decreased appetite, migraine, dizziness, weakness, fatigue, lethargy, sleepiness, hot flashes, abdominal pain, diarrhea, vomiting, flushing, development of warts, spots, and freckles, and itchy skin (between 1% and 10% of people)

Polymorphisms in the gene encoding tyrosinase, an enzyme essential for melanin production, can affect pigmentation efficiency

Niacin The niacin (vitamin B 3 ) coenzymes, NAD and NADP, are needed for several redox and other reactions in the body (see the article on Niacin)