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Specifically, UV irradiation can mediate damage of lens structures, due to: direct absorption of the incident light by the cellular components, resulting in excited state formation and subsequent chemical reaction, and photosensitization mechanisms, where the light is absorbed by endogenous photosensitizers that are excited to their triplet states 6

According to the NIH, you absorb only about 50% of the B12 you take in

Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a casual relationship to drug exposure

Historically, digestive supplements aimed at gluten relied almost entirely on a single enzyme known as DPP-IV (dipeptidyl peptidase IV)