The inhibition is competitive glutathione competes with tyrosine (the amino acid tyrosinase acts on) for enzyme binding sites which is why the relationship between dosing, delivery method, and effect is not linear
Can Glutathione Cream Improve Dull Look

Ingredients (INCI) Aqua, Tetrahexyldecyl Ascorbate, Dimethicone, Glycerin (Humectant), C9-12 Alkane, Ascorbyl Glucoside, Pyrus Malus (Apple) Fruit Extract, Hydrogenated Lecithin, Polyglyceryl-6 Polyricinoleate, Mannitol, Sodium Hydroxyde, Acrylates Copolymer, Xanthan Gum, Glutathione, Ergothioneine, Oryza Sativa (Rice) Bran Extract, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Cetyl Alcohol, Caprylyl Glycol, Lysine Carboxymethyl Cysteinate, Coco Caprylate/Caprate, Tocopherol (Vitamin E), Sodium Citrate, Sodium Phytate, Hexylene Glycol, Ethylhexylglycerin, Helianthus Annus (Sunflower ) Seed Extract, Urea, Caprylic/Capric Triglyceride, Sodium Pca, Rosmarinus Officinalis Leaf Extract, Polysorbate 60, Sorbitan Isostearate, Trehalose, Ascorbic Acid, Glucose, Vanilla Planifolia (Vanille) Fruit Extract, Polyquaternium-51, Triacetin, Sodium Hyaluronate, Phenoxyethanol Available at the Cosmeterie store Legal information Customer Reviews 1 English review written for Paula's Choice 25% Vitamin C + Glutathione Clinical Serum 5,0 out of 5 stars 3 reviews 1 customer review in English 1 customer review in all languages Rated with 5 out of 5 stars

SARS-CoV2 infection impairs the metabolism and redox function of cellular glutathione