L-Theanine - Suntheanine®

  • Contains Suntheanine®
  • Pure L-isomer Theanine
  • Mood, sleep and stress
  • Nootropics
  • 150 mg per capsule
  • 90 vegetable capsules
Out of stock
EUR 28.75
  • Shipping within 3 days
  • Questions about this product? Call +3124 - 663 53 66 or chat with us

L-Theanine - Suntheanine® by Doctor's Best

L-Theanine featuring Suntheanine® contains 100% pure patented L-theanine from Japan. L-theanine (L-glutamic acid-gamma-monoethylamide) is a glutamine-like amino acid that gives tea its characteristic taste. It is a non-protein amino acid as it is not built into bodily proteins.


  • 100% patented Suntheanine®
  • Non-protein amino acid
  • Feel Zen again
  • Pure and bioactive
  • Does not contain gluten or soy; GMO-free
  • Suitable for vegans and vegetarians

Proprietary, pure L-theanine

This product contains only L-Theanine from the patented Suntheanine ® brand. Suntheanine® is produced by a natural enzymatic process resulting in 100% pure L-isomer theanine. Theanine products can also contain the D-form (D-theanine), but this form is inactive. The makers of L-theanine Suntheanine ® have won an award for this product. In the United States, it enjoys GRAS (Generally Recognized As Safe) status, meaning it has been found safe by the Food and Drugs Administration (FDA).

The history of tea

Tea most likely originated in Yunnan, China, during the Shang Dynasty (1500 - 1046 BCE). The medicinal drink tea was, unsurprisingly, first described in a Chinese text. Chinese tea was introduced in the 16th century to Portuguese priests who took small quantities back to Portugal. However, it was the Dutch who first imported tea on a large scale. Tea then became a popular drink among the Dutch. From there it found its way all over Europe, Britain in particular, where it was initially drunk mainly by the affluent.


After water, tea has become the most consumed drink in the world. Consumption has traditionally been associated with vitality and relaxation. Tea comes in many different types and flavors, but the traditional tea plant is the Camellia sinensis. The leafs of this plant are used in black tea as well as green tea. Camellia sinensis grows in tropical and subtropical countries and contains a host of bioactive substances, such as flavonoids and L-theanine. In 1949, Japanese researchers discovered L-theanine as being a key tea compound. Since then this substance has been widely researched and utilized.

About Doctor's Best

Doctor's Best produces high-quality food supplements based on scientific research into good nutrition. The raw materials for the products are grown, developed and researched worldwide. Doctor's Best works together with nutrition scientists to produce strictly high-quality, highly effective supplements. Only branded raw materials are used and supplements have been thoroughly tested during every step of the production process, from raw material to end product. The manufacturing process is integrally based on the Guidelines for Current Good Manufacturing Practice (cGMP). Doctor's Best was founded in 1990 by a physician with an interest in wholesome nutrition. The company’s product range now includes more than 200 items.

Standardized brand products

In its products Doctor's Best almost exclusively uses proprietary and standardized brand materials of official trademarks that have been extensively researched. The authenticity of these ingredients is guaranteed in all products. Doctor's Best never uses alternatives. This results in a qualitatively superior line of supplements with very high bioavailability.

More Information
Product Name
L-Theanine - Suntheanine®
Doctors Best
90 capsules
User Instructions

Take 1 capsule daily without food or as recommended by a healthcare practitioner. Warning: Not recommended for pregnant and breastfeeding women.

Ingredients per Serving

150 mg L-theanine (from Suntheanine®).

EU Norm
*RDA = Recommended Daily Allowance
Other Ingredients

Microcrystalline cellulose, hypromellose (vegetarian capsule).

Vegan, Vegetarian
Storage: see label. Keep out of the reach of children. Consult an expert before use in case of pregnancy, breastfeeding, illness or medication.
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