Niacinamide

Time Frame	Effect of Niacinamide	Suitable Skin Types
Immediately–few days	Increased hydration, calmed redness, reduced irritation	All skin types (especially sensitive, acne-prone, combination)
4–8 weeks	Smoother texture, reduced acne, brighter skin tone	All skin types (especially oily, acne-prone, combination)
8–12 weeks (consistent use)	Faded dark spots, minimized pores, improved elasticity, visible anti-aging benefits	All skin types (especially aging, uneven tone, enlarged pores)