In general, once a month is required to sustain results
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Prioritize absorption: Choose a liposomal format so you don't have to take massive doses to see a benefit
In 2017, Suvasini Sharma et al

Ingredients: Water, Butylene Glycol, Caprylic/Capric Triglyceride, Beeswax, Niacinamide, Cetearyl Alcohol, Isononyl Isononanoate, Arachidyl Alcohol, 1,2-Hexanediol, Polyglyceryl-3 Methylglucose Distearate, Behenyl Alcohol, Glyceryl Stearate, Betaine, Dimethyl-trimethylsilyloxysilane, Arachidyl Glucoside, Cetearyl Olivate, Arginine, Carbomer, Sorbitan Olivate, Allantoin, Glycerin, Panthenol, Tocopherol, Xanthan Gum, Glutathione(600 ppm), Dipotassium Glycyrrhizate, Ethylhexylglycerin, Disodium EDTA, Sodium Hyaluronate , Glucose, Alcohol, Malva Sylvestris (Mallow) Extract, Melissa Officinalis Leaf Extract, Alchemilla Vulgaris Extract, Achillea Millefolium Extract, Veronica Officinalis Extract, Mentha Piperita (Peppermint) Leaf Extract, Primula Veris Extract, Lycopodium Clavatum Extract, Equisetum Arvense Extract, Ceramide NP, Hydrogenated Lecithin, Polyglyceryl-10 Stearate, Sodium Hydroxide, Sodium Ascorbyl Phosphate, Biotin, Folic Acid, Pyridoxine, Cyanocobalamin, Linoleic Acid, Riboflavin, Beta-Carotene, Thiamine HCl, Copper Tripeptide-1, Acetyl Hexapeptide-8, Palmitoyl Pentapeptide-4, Palmitoyl Tetrapeptide-7, Palmitoyl Tripeptide-1, Fragrance

GSH levels in BAL fluid did not differ across the 3 groups (overall P = 0.262)