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Injectable administration bypasses that step
Vitamin C modern formulations are often compatible, but if irritation occurs, use one in the morning and the other at night 3
Use a 31-gauge, 5/16-inch (8 mm) needle on a U-100 insulin syringe
Alexander C, Swanson KS, Fahey GC, Jr, Garleb KA
Personally, I know through genetic testing that I have the SNP (single nucleotide polymorphism) rs1050450(C;T) on my GPX1 gene which reduces my glutathione peroxidase activity and therefore my ability to combat oxidative stress
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