It is the minimum a compound has to survive before anyone can honestly say it works, and the gray market exists to sell you the feeling of a cleared bar without the trial
Sample tube test: take micro glass cuvette, add 20 L of sample, 140 L of Reagent II, 40 L of Reagent III in turn, mix well, and then stand for 2 minutes to test the absorbance ATat 412 nm, A = AT AB
10.1038/onc.2017.38 140 ZhouL.QuH.YangL.ShouL
It helps in balancing moisture and gives the skin a silky, smooth texture
These numbers come from various research contexts and individual results vary based on age, baseline condition, protocol adherence, and other factors