The global hair serum market is a robust and steadily growing segment of the personal care industry, valued at approximately USD 1.3 billion in 2025 and projected to reach around USD 2.4 billion by 2035, with a compound annual growth rate (CAGR) between 5.8% and 8.5% depending on the forecast period and source. The market growth is underpinned by increased consumer focus on hair...