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sparing the active peptide ingredients from degradation by the proteolytic enzyme, pepsinogen

The discovery of superoxide dismutase in mammals and then in plants underlined the physiological importance of oxygen free radicals in biological cells (McCord and Fridovich 1969

Diabetologia 60 , 15661576 (2017)

But persistent foam that does not settle within a minute or two could indicate protein denaturation

doi: 10.1016/j.tem.2013.01.005 [DOI] [PMC free article] [PubMed] [Google Scholar] 5

It is also important to ascertain how long the depigmenting effect thus achieved would last and what the long-term effects would be on skin color by repetitive treatments lasting several weeks