A number of animal groups, including primates, lack ascorbate biosynthesis capacity due to loss of function mutations in the biosynthetic enzyme L-gulono-1,4-lactone oxidase [1] but according to genome sequence analysis biosynthesis capacity may be lacking in other protist groups [2]
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For more peptide comparisons, read our blogs about sermorelin vs hexarelin, sermorelin vs CJC-1295, sermorelin vs ipamorelin, tesamorelin vs IGF-1 LR3 or tesamorelin vs sermorelin.
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Also, UV light lowers the skins vitamin C levels
It concurrently impairs antioxidant defenses (e.g., by inhibiting catalase) [32] and promotes inflammation by elevating pro-inflammatory cytokine levels and reducing nitric oxide (NO) bioavailability [33]