The Niacinamide Serums Market is projected to grow from USD 3,051.20 Million in 2025 to USD 9,151.40 Million by 2035, at a CAGR of 11.60%. The 6–10% strength segment will dominate with a 51.00% share, while tone-evening/brightening will lead the function segment with 48.00% share in 2025.