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Bioavailability is a measure of how much of a substance actually enters systemic circulation and is available to have an active effect

Some ingredients (like strong vitamin C or kojic acid) can be a little much for sensitive skin

Hepatology 15:11671172 Purucker E, Winograd R, Roeb E, Matern S (1998) Glutathione status in liver and plasma during development of biliary cirrhosis after bile duct ligation

Old targets, new strategy: apigenin-7-O-beta-d-(-6-p-coumaroyl)-glucopyranoside prevents endothelial ferroptosis and alleviates intestinal ischemia-reperfusion injury through HO-1 and MAO-B inhibition

A high affinity, low capacity and a low affinity, high capacity process