Both appear in research and practitioner protocols
Easy to use Gives energy I really havent felt any different nor lost any weight but I have been eating less Good Fast processing, fast shipping
*This product is provided for educational and research purposes only
It inhibits NNMT (nicotinamide N-methyltransferase), an enzyme regulating metabolism, fat storage, and NAD+ consumption.[4][27][6] NNMT methylates nicotinamide, a NAD+ breakdown product, diverting it from recycling and reducing available NAD+
Conze D, Brenner C, Kruger CL
All of them will work, but some will just be more comfortable to use