Opened in August 2025. Used only once, taken onto the palm with the included dropper. I believe there are no hygiene issues. I'm selling it because I don't have a chance to use it. It has higher absorption than conventional vitamin C, prevents spots and freckles caused by sun exposure, and leads to bright, translucent skin. Pores Blackheads Also effective in controlling sebum. ◾︎VC Conc Contents: 30mL Unopened ◆Discounts are available for combined purchases and shipping with other products. Please comment in the comment section with the products you wish to purchase together◆ Ingredients: Water, Glycerin, BG, Pentylene Glycol, 3-Glyceryl Ascorbic Acid, Bisethoxy Diglycol Cyclohexane-1,4-Dicarboxylate, 3Na Palmitoyl Ascorbyl Phosphate, 3-O-Ethyl Ascorbic Acid, Glyceryl Ascorbate, Hydroxypropyl Methylcellulose Stearoxy Ether, Citric Acid, Sodium Citrate, Pentetic Acid 5Na