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L-Theanine Half-Life & Clearance
Understand how long L-Theanine stays in your bloodstream, its metabolic pathways, and how to time your doses optimally.
Standard Pharmacokinetics
Chart represents a single standard dose processed by a normal metabolizer over 24 hours.
Key Metrics
1.5 hrs
Average Half-Life
+0.75 hrs
Time to Peak (Tmax)
Minimal; L-theanine is absorbed rapidly regardless of food
Food interaction
Build Your Full Schedule
See how L-Theanine overlaps with caffeine, modafinil, and your target bedtime.
Open Interactive CalculatorMetabolism & Excretion
Pathway
Enzymatic hydrolysis in small intestine and kidney (to ethylamine + glutamate)
Elimination
Urine
Important Nuances
Short half-life means effects peak at 1–1.5 hours and mostly clear within 4–5 hours. Safe to take at any time of day.
Frequently Asked Questions
How long does L-Theanine last?
L-theanine peaks at about 45–75 minutes and has a half-life of ~1.5 hours. Most people feel effects for 3–5 hours. It does not affect sleep when taken in the evening.
Check Your Full Stack for Interactions
Add all your supplements and prescription medications at once.