This is a niacinamide serum specially designed for skin with uneven tone, dullness, enlarged pores and excessive sebum secretion. It uses high-purity niacinamide as the core active ingredient to jointly improve skin tone and pore problems. Niacinamide helps reduce melanin transfer to keratinocytes, improving acne marks, dullness and uneven skin tone for a brighter and more even complexion. It also helps regulate sebum secretion, improve T-zone shine, and visually shrink and refine pores, giving the skin a fresh and delicate texture. The formula can be compounded with sodium hyaluronate, pantenol, zinc PCA and witch hazel extract to replenish moisture and soothe the skin while brightening and controlling oil, avoiding dryness and tightness caused by simple oil control. The texture is usually fresh watery or light lotion texture, absorbs quickly, does not clog the skin and is non-sticky. It can be used after toner and before cream, or for brightening before makeup. It is recommended to use it morning and evening after cleansing and toning, followed by moisturizer and sunscreen. Long-term use can improve oiliness, dullness, enlarged pores and acne marks, making the skin more even and bright.