They read labels
10.1104/pp.126.2.564 Summary Keywords glutathione, metal/metalloids, osmotic stress, oxidative stress, proline, redox homeostasis, salinity stress Citation Anjum NA, Aref IM, Duarte AC, Pereira E, Ahmad I and Iqbal M (2014) Glutathione and proline can coordinately make plants withstand the joint attack of metal(loid) and salinity stresses
This means you get a natural, gradual brightening effect that looks healthy, not artificial
BloodBrain Barrier, BloodCerebrospinal Fluid Barrier, and Neurovascular Unit The mammalian brain is separated from the general circulation system by the BBB, which is localized in the brain capillaries and pia-subarachnoid membranes, and the BCB localized in the choroid plexus of the brain ventricles