"Vitamin F is another name for essential fatty acids (EFA), like linoleic and alpha linoleic acids," says cosmetic chemist Ginger King
A study in people with uncontrolled diabetes found that dietary supplements with cysteine and glycine increased glutathione levels, while damage and oxidative stress were reduced [6]
Is the serum stable in air, or does it require sealed packaging
A similar effect preserving the levels of reduced glutathione and vitamin C was demonstrated in rats with diabetic cataracts caused by streptozotocin [97,99]
For maximum efficacy throughout its 24-month shelf life, store the product in a cool, dry, and dark place
Marrocco I, Altieri F, Peluso I (2017) Measurement and clinical significance of biomarkers of oxidative stress in humans