Niacinamide is an amide compound of Nicotinic Acid. Niacinamide is also a fundamental vitamin supplement in clinical dermatology treatment; it is commonly used in the treatment of light-sensitive dermatitis, acne, and more. Recent studies have shown that Niacinamide is effective in preventing melanin accumulation; based on this feature, its application in the cosmetic field has been further expanded. Niacinamide can reduce skin whitening/skin spots, accelerate cell metabolism, and be used to reduce hyperpigmentation. Niacinamide can help maintain the skin's moisture content and promote dermal microcirculation. Additionally, Niacinamide can significantly reduce skin issues caused by aging or external factors such as wrinkles, peeling, and enlarged pores, and it can reduce the damage caused by free radicals to the skin. Niacinamide can also stimulate the circulation of hair follicles and reduce hair thinning and hair loss.