Blood levels and urinary excretion of vitamin B12 in man after a single parenteral dose of aqueous hydroxocobalamin, aqueous cyanocobalamin and cyanocobalamin zinctannate complex
Or maybe its because NAC can help with glutamate in the brain (neurotransmitter)
You can add it to almost any lotion, cream, or serum, use it in homemade formulas, or incorporate it into hair, Skin, and nail products
Induction of circulating myelin basic protein and proteolipid protein-specific transforming growth factor-B1-secreting Th3 T cells by oral administration of myelin in multiple sclerosis patients

S-Acetyl Glutathione Synergy is designed to support your body's antioxidant defenses, healthy detoxification, and cellular health.* S-Acetyl Glutathione Synergy contains S-acetyl glutathione for direct antioxidant support, NAC to help your body make its own glutathione, and vitamin B6 as P5P to support key functions in your cells and brain.* You may notice support for antioxidant balance, normal detoxification, cellular health and repair, a healthy immune response, and healthy aging as the body's master antioxidant system is replenished.* Glutathione needs can rise with stress, poor diet, and aging, so results may vary based on your current antioxidant levels, lifestyle, and guidance from your healthcare practitioner.* S-Acetyl Glutathione Synergy is designed for daily use when taken as directed.* It is gluten-free, dairy-free, soy-free, and non-GMO