The L-theanine segmentation by application delineates five primary end‑uses that collectively drive market revenue. Nutraceuticals—including capsules, tablets, and powders—represent the largest share, accounting for roughly 40 % of total sales, due to strong consumer demand for stress‑relief and sleep‑support supplements. Functional beverages such as tea, energy drinks, and ready‑to‑drink relaxants contribute about 30 % of the market, reflecting the beverage industry's rapid incorporation of L-theanine to differentiate premium product lines. Pharmaceuticals occupy an estimated 15 % share, where L-theanine is investigated as an adjunct for anxiety, hypertension, and neuro‑protective therapies, attracting higher price points and longer product cycles. Food & confectionery—including fortified snacks, dairy, and chocolate—capture roughly 10 % of revenue, leveraging L-theanine’s flavor‑neutral profile for added functional claims. Finally, Personal care products such as skin‑care creams and aromatherapy formulations hold a modest 5 % share, primarily driven by niche wellness branding. These application segments together define the overall market size and inform strategic allocation of R&D and marketing resources.