Sodium alginate thickener, a natural polysaccharide derived from brown seaweed, is widely employed to enhance viscosity, stabilize emulsions, and improve texture across food, pharmaceutical, and personal‑care formulations. Sodium Alginate Thickener market size was estimated at approximately USD 380 million in 2025, with a market forecast projecting growth to roughly USD 560 million by 2033, reflecting a CAGR of 5.4% over the forecast period. The growth outlook is underpinned by rising clean‑label consumer demand, expanding functional food portfolios, and heightened regulatory scrutiny that favors biodegradable, non‑synthetic additives. Macro drivers include escalating global protein consumption, intensified focus on sustainable sourcing, and the rapid rollout of plant‑based product lines, all fueling industry expansion.