L Theanine Supplement Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Nutricost is the best-performing l theanine supplement brand in July 2026, moving 40,000 units across 2 ASINs for 33.1% of Top 10 volume. Nature's Trove follows with 20,000 units (16.5%), ahead of Integrative Therapeutics on 10,000 units (8.3%).

Volume is spread across 9 brands, with the top three holding 57.9% between them. No single label controls the shelf, which usually leaves room for a well-differentiated listing to take share without outspending an incumbent. Average selling prices among the leaders run from $9.98 to $22.00, which frames the price band a competing listing has to justify.

Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, one ASIN forced its way in: B0797BLW59 booked 7K units at $68.00, with ▲ 16.7% MoM change. On the growth side, B07Z9K1LM2 leads positive momentum with ▲ 50.0% MoM growth on 3K units, with B000GFHPCU close behind at ▲ 42.9% MoM on 1K units.

The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.