The nonenzymatic defense system includes glutathione (GSH), flavonoids, dietary antioxidants such as vitamins A, C, and E, selenium and carotene (23)
You can get glutathione via foods or supplements
Shilpa: Liposomes 101 offers a straightforward overview
"A Comparative Analysis of S-Acetylglutathione and Liposomal Glutathione Bioavailability." BenchChem.
Although even low doses of antioxidants can prevent or delay the oxidation of proteins, lipids and nucleic acids, there is no convincing evidence to suggest that antioxidants reduce the severity of allergy symptoms or slow the progression of the disease
A number of in vitro and in vivo studies animal and human have demonstrated the antioxidant efficacy of astaxanthin and its benefits in the prevention and/or treatment of oxidative stress-related neurodegenerative diseases and cardiovascular diseases