(2017) showed continued skin brightening improvements through week 12 compared to week 4 and week 8 measurements

All ingredients: Sea buckthorn water, glycerin, dipropylene glycol, propanediol, niacinamide, 1,2-hexanediol, caprylic/capric triglyceride, water, PG-13-decyl tetradeceth-24, hydroxyacetophenone, caprylyl glycol, hydrogenated lecithin, carbomer, glutathione (674 ppm), tromethamine, cetearyl alcohol, disodium EDTA, stearic acid, dipotassium glycyrrhizinate, Kakadu plum extract, butylene glycol, lecithin, pentylene glycol, acetylglutamine, sodium hyaluronate, folic acid, Bacillus thuringiensis/soybean ferment extract, oligopeptide-1, hexapeptide-11, oligopeptide-2, oligopeptide-3, hydrolyzed pea protein, madecassoside, phytosterols, squalane, oil Olive, Tocopherol, Polyglyceryl-10 Stearate, Panthenol, Hyaluronic Acid, Hydrolyzed Hyaluronic Acid, Hydroxypropyltrimonium Hyaluronate, Hydrolyzed Sodium Hyaluronate, Potassium Hyaluronate, Ceramide NP, Sodium Ascorbyl Phosphate, Shea Butter, Ethylhexylglycerin, Cross-linked Sodium Hyaluronate, Biotin, Pyridoxine, Cyanocobalamin, Riboflavin, Thiamine HCl, Retinol, Bioflavonoids, Acetyl Sodium Hyaluronate, Menadione, Acetyl Hexapeptide-8, Copper Tripeptide-1, Palmitoyl Pentapeptide-4, Linoleic Acid, Beta Carotene, Fragrance

Before diving into pricing, lets start with the basics
E.et al (2005)