Quick Answer: Neither NAC nor glutathione is universally "better." NAC is a precursor that helps your body produce its own glutathione, while direct glutathione supplementation provides the finished antioxidant
Whats the regulatory status

WATER, ETHYLHEXYL METHOXYCINNAMATE, BUTYLENE GLYCOL, ETHYLHEXYL SALICYLATE, OCTOCRYLENE, BIS-ETHYLHEXYLOXYPHENOL METHOXYPHENYL TRIAZINE, BUTYL METHOXYDIBENZOYLMETHANE, DIPROPYLENE GLYCOL, NIACINAMIDE, SQUALANE, C14-22 ALCOHOLS, 1,2-HEXANEDIOL, POLYGLYCERYL-2 STEARATE, PROPANEDIOL, HYDROXYACETOPHENONE, GLYCERYL STEARATE, STEARYL ALCOHOL, C12-20 ALKYL GLUCOSIDE, TROMETHAMINE, CENTELLA ASIATICA EXTRACT, CARBOMER, MELALEUCA ALTERNIFOLIA (TEA TREE) EXTRACT, HIPPOPHAE RHAMNOIDES FRUIT EXTRACT, VITIS VINIFERA (GRAPE) FRUIT EXTRACT, ACRYLATES/C10-30 ALKYL ACRYLATE CROSSPOLYMER, UNCARIA SINENSIS EXTRACT, GLYCERIN, ADENOSINE, DISODIUM EDTA, ORYZA SATIVA (RICE) BRAN EXTRACT, HYDROGENATED PHOSPHATIDYLCHOLINE, CAPRYLIC/CAPRIC TRIGLYCERIDE, SODIUM HYALURONATE, GLUCOSE, HYDROLYZED COLLAGEN, SUCROSE STEARATE, GLUTATHIONE, CYCLODEXTRIN, CETEARYL ALCOHOL, CAPRYLYL GLYCOL, BETA-GLUCAN, CAPRYLHYDROXAMIC ACID, ETHYLHEXYLGLYCERIN, ASIATIC ACID, ASIATICOSIDE, MADECASSIC ACID, MADECASSOSIDE, TROPOLONE, HYALURONIC ACID, POTASSIUM HYALURONATE *** Ingredients are subject to change at the manufacturer's discretion

Use the Peptide Calculator before reconstitution so travel does not become the moment you try to solve concentration math
Common solvents include bacteriostatic water, sterile saline, acidic buffers, and compatible analytical solvents