L-theanine is a premium and effective ingredient found in some high-quality nootropic supplements as well, which help promote cognitive function and brain activity in a convenient, targeted delivery format.*Ī 2012 study published in The Journal of Nutrition found that L-theanine uptake and metabolism in healthy participants is effective and comparable when provided via capsules or green tea 11, so you can leverage the power of this amino acid bioactive in multiple ways! 12 Data indicates that L-theanine at "realistic dietary levels" as low as 50 milligrams has significant mental effects 10 (on alertness and cognitive arousal).* The L-theanine content of tea varies considerably, with estimates around 1 to 2% of the dry weight of leaves and a single cup of tea containing around 25 to 60 milligrams 9 of L-theanine. Green tea contains small amounts of caffeine, plus the added bonus of healthy catechins, polyphenolic antioxidants, and flavonoids (e.g., EGCG) that offer further overall health-protective benefits. L-theanine is present in green, black, and white teas, with green tea containing the most L-theanine (hello, matcha everything!).
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