Bests & Worsts Reviews from Amazon

I am a physician in his 70's --18months on Niagen--I take up to a gram a day as per clinical studies and no adverse effects Positive effects: improved online blitz 3 minute chess scores less delayed onset muscle soreness post exercise less dependent on pain relievers especially NSAIDS improved tennis having migrated from intermediate/social doubles to singles even to competing in state tournaments improved skin, faster nail and hair growth white hair has become darker have not be ill except for one episode ? food poisoning in 18 month( previously prolonged hacking cough post URI everywinter plus flu episodes) less sweet craving at least 10 lb weight loss without conscious dietary change lowered blood pressure to levels when I was 20, especially systolic BP 20 % improvement in renal function studies I suspect it will has positive longevity implications--You can wait for the definitive studies in a decade or 2 but Im hedging my bets now Cons: expensive that's all I can think of at the moment--all the best