There are studies showing that when purity increases by 0.1%, absorption rate can be increased by 2 to 5 times. There are also studies showing that NMN with a purity of 99.3% is not absorbable at all. Let’s take iHealth’s 99.8% purity that allows 95% absorption as a base. Under a very conservative calculation: 99.8% purity = 95% absorption (iHealth) […]