NMN stands for nicotinamide mononucleotide, a molecule naturally occurring in all life forms. At the molecular level, NMN is composed of a nicotinamide group, a ribose sugar and a phosphate group. NMN is the direct precursor of nicotinamide adenine dinucl
This water doodle book simply use the pen to color with water. The color appear with every stroke! Then let the page dry to erase the pictures and fill it in again and again.