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Nutrients such as riboflavin, selenium, and molybdenum are essential for this glutathione recycling pathway
Polycyclic aromatic hydrocarbons (PAHs) found in cigarette smoke, for example, have been shown to decrease the activity of P450 enzymes, leading to a decrease in SAMe production and impaired DNA methylation
Recognizing this lets researchers reason clearly about controls: a vehicle control, a copper-only control, and where appropriate a scrambled-sequence control help separate effects attributable to the specific GHK sequence from effects of copper delivery or peptide bulk
Vitamin D: In a 2013 study, psoriasis symptoms significantly improved in patients receiving high daily doses of vitamin D3 in combination with a low-calcium diet
These doses are unique to the research protocol and vary between studies
