Retail price: ¥15,840 C-Serum is a vitamin C serum that leads to even skin tone* without unevenness. It contains delicate vitamin C (ascorbic acid) in powder form, which penetrates the skin conditioning ingredients into the stratum corneum, leading to transparent and smooth skin. Purchased around autumn 2023. Expiration date is May 2026 (as indicated on the product). Unused, unopened.