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glutathione equilibrium Glutathione: Overview of its protective roles, measurement, and biosynthesis Glutathione Symmetry provides steady antioxidant and liver support using S Glutathione - Wikipedia
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doi: 10.1002/sim.7221 35

This includes people who dont get enough sun, older people whose bodies are unable to produce as much Vitamin D, and people with darker complexions, whose skin is more resistant to the suns UV rays

10.1021/jf9020152 187 WangX.ShiG.XuQ.HuJ

It only took about 13 years

Ascorbic acid requirements for smokers: Analysis of a population survey
