L-Theanine: Potential Benefits and Risks of a Novel Nootropic and Relaxation-Promoting Agent

L-theanine is a novel nootropic and relaxation-promoting agent that has gained popularity among individuals seeking to improve their mental performance and reduce stress. It is a non-protein amino acid found naturally in green tea leaves and has been shown to have a variety of beneficial effects on the brain and body. However, the potential benefits and risks of L-theanine usage are not well understood, and further research is needed to evaluate its long-term safety and effectiveness.


The recommended dose of L-theanine is 100-200 mg per day, taken orally with or without food. It can be taken as a single dose or divided into two or three smaller doses throughout the day.

Positive effects

  • Improved cognitive performance, including increased alertness, attention, and memory
  • Reduced stress and anxiety, without causing drowsiness or sedation
  • Improved sleep quality and reduced symptoms of insomnia
  • Potential therapeutic effects in individuals with neurodegenerative diseases and other conditions

Negative effects

  • Common side effects, such as dizziness and gastrointestinal discomfort
  • More severe side effects, such as liver damage and allergic reactions, have been reported in some cases
  • Potential for drug interactions with other medications
  • Unknown long-term safety and effectiveness


L-theanine was first isolated from green tea leaves in 1949 and has been extensively studied for its potential therapeutic effects. It is available as a dietary supplement and is also found in some food products, such as chocolate and certain beverages. In recent years, L-theanine has gained popularity as a nootropic and relaxation-promoting agent, and has been investigated for its potential benefits in a variety of conditions, including anxiety, insomnia, and neurodegenerative diseases.

In conclusion, L-theanine is a novel nootropic and relaxation-promoting agent that has been shown to improve cognitive performance and reduce stress in healthy individuals. However, further research is needed to evaluate the long-term safety and effectiveness of L-theanine, and individuals who use L-theanine should do so with caution and under the guidance

Where can you buy L-Theanine?

Below we've compiled an index of all the vendors that have L-Theanine for sale that we could find.
If we've missed one, please do not hesitate to contact us to have it added!

You can use the filtering options to search for powders and capsules.
Compare are the options and find the dosage you need and get a cheap purchase.
All prices are weekly updated.


  1. https://www.braintropic.com/nootropics/l-theanine/ (Monday, March 11, 2019)
  2. https://en.wikipedia.org/wiki/Theanine (Monday, March 11, 2019)
  3. https://examine.com/supplements/theanine/ (Monday, March 11, 2019)
Per Cap.
LiftmodeCaffeine 100mg + L-Theanine 150mg (300 count) - 99+% Pure300 capsules-$0.07 $21.88View
LiftmodeL-Theanine 200mg (300 count) - 99+% Pure300 capsules-$0.08 $24.68View
LiftmodeCaffeine 100mg + L-Theanine 150mg (150 count) - 99+% Pure150 capsules-$0.10 $14.88View
LiftmodeL-Theanine 200mg (150 count) - 99+% Pure150 capsules-$0.10 $15.68View
BulksupplementsL-Theanine 300 Gelatin300 capsules-$0.10 $28.96View
PureBulkL-Theanine 300ct 500mg Gel. Caps. -300 capsules-$0.11 $32.50View
MindnutritionL-Theanine 60 Veggie Caps (200mg)60 capsules-$0.12 $9.45View
PureBulkL-Theanine 120ct 500mg Gel. Caps. -120 capsules-$0.13 $15.25View
BulksupplementsL-Theanine 100 Gelatin100 capsules-$0.14 $13.96View
LiftmodeL-Theanine 200mg (70 count) - 99+% Pure70 capsules-$0.15 $10.68View
AbsorbyourhealthL-Theanine100 capsules200mg$0.16 $15.99View
LiftmodeCaffeine 100mg + L-Theanine 150mg (70 count) - 99+% Pure70 capsules-$0.16 $10.88View
NootropicsdepotCaffeine + L-Theanine 100mg Caffeine + 200mg L-Theanine - 180ct.180 capsules200mg$0.16 $27.99View
NootropicsdepotCaffeine + L-Theanine 200mg Caffeine + 100mg L-Theanine - 180ct.180 capsules100mg$0.17 $29.99View
NootropicsdepotCaffeine + L-Theanine60 capsules200mg$0.23 $13.99View
NootropicsL-Theanine60 capsules200mg$0.25 $15.00View
NootropicsdepotCaffeine + L-Theanine 200mg Caffeine + 100mg L-Theanine - 60ct.60 capsules100mg$0.25 $14.99View
DoublewoodsupplementsL-Theanine60 capsules-$0.32 $18.95View
MindnutritionL-Theanine 120 Veggie Capscapsules-- $17.70View
NootropicsdepotL-Theanine 200mgcapsules200µg- $11.99View