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These involve among others, the Se-based organic compound ebselen, possessing a wide substrate specificity (Sies 1993a)

Any excess B12 is eliminated by the kidneys

In photoaged skin, COL1A1 mRNA expression levels are reduced, whereas MMP-1 mRNA expression levels are increased in association with collagen metabolism (67)

Additionally, in a 30-day placebo-controlled trial in 300 adults (aged 18-65 years), supplementation with the B vitamins (at doses of about 3 to 13 times the RDA, excluding folic acid), vitamin C (1,000 mg/day), calcium (100 mg/day), and magnesium (100 mg/day) was associated with significant improvements in various scores of psychological stress compared to a placebo (139)