Free delivery
L-Theanine - Image 1
L-Theanine - Image 2
L-Theanine - Image 3
L-Theanine - Image 4
L-Theanine - Image 5
(1)

L-Theanine

€24.95
Trusted ShopsTrusted Shops certified
1

Due to high demand: only limited stock remaining in the EU warehouse

  • PayPal
  • Klarna
  • SEPA-Lastschrift
  • Sofort
  • giropay
  • Google Pay
  • American Express
  • Visa
  • Mastercard
  • Maestro
Trusted ShopsTrusted Shops certified
Product description
Key Benefits
  • Provides 200 mg L Theanine per serving.
  • Contains a single amino acid ingredient.
  • Free from soy and gluten.

L Theanine is a naturally occurring amino acid that is structurally similar to certain neurotransmitters found in the body. It is not commonly obtained through everyday dietary sources and is therefore often consumed in supplemental form. This formulation provides 200 mg of L Theanine per serving using a straightforward ingredient profile. It is free from soy and gluten and produced using non GMO ingredients, making it suitable for everyday dietary use.
Why Double Wood Supplements is Healf
Double Wood Supplements, founded by twin brothers Reese and Evan Wood in 2013, was created with a focus on transparency, quality, and accessibility. The brand is known for its straightforward, single-ingredient formulations that allow customers to make informed choices about their wellbeing. Each product is third-party tested, with Certificates of Analysis available to ensure safety and integrity. Through its commitment to science and honesty, Double Wood Supplements continues to make high-quality products available to everyone.

With our Healf Curation Process, we do the work for you. Shop with confidence knowing that every item has been tried, tested, and curated for you.

Learn more about each step — Brand Discovery, Expert Validation, and Community Testing — here.
Ingredients
L-Theanine, Gelatin (Capsule), Rice Flour, Anti-Caking Agent (Vegetable Stearate), Anti-Caking Agent (Silicon Dioxide)
Suggested use
The typically recommended dosage of L-Theanine is 100 – 200 mg, although when combined with Caffeine a dosage of 200 mg is more common. There is evidence that exceeding a dosage of 200 mg has little additional benefit, as when more than 200 mg is taken the excess is used by the body as a raw material for protein production.

While the standard 200 mg dosage can be exceeded without much risk of adverse side effects, it is generally a waste of money and is not recommended.

Additional Information:

Food supplements and foods sold by Healf should not be used as a substitute for a varied, balanced diet and healthy lifestyle.

If you are pregnant, breastfeeding, have a medical condition, or are taking any medications, please consult with a healthcare professional before use. Use products only if the seal is intact. Store in a cool, dry place, out of the reach of young children. Do not exceed the recommended daily intake.

We make every effort to ensure that product information on our website is accurate and up to date, but packaging and ingredients may occasionally vary from images shown on site. Please refer to the product label and contact Healf before use if you have any questions regarding your specific allergies or intolerances.

Reviews

  • 9 days ago

    L-Theanine

    I bought L-Theanine to take alongside Magnesium L-Threonate as it is supposed to aid sleep and cognitive function. I am sleeping better, but I would need to take them for a couple of months before I put it down to these combinations specifically.

    Treva O.Verified Buyer
  • 28 days ago

    Great quality product

    To combat brain fog and general fatigue I have been taken one of these each morning with some caffeine and it really takes the edge off the caffeine and helps to avoid any sort of afternoon crash. It gives all I want from the caffeine and helps me avoid all the bad stuff. Taken on its own without any caffeine also shows what a capable supplement it is. I suffer from anxiety and stress and L-theanine really helps to level me out. I also take one an hour before bed in combination with my magnesium glycinate and it really helps to calm me, quieten my 'what can i worry about here in my bed' intrusive night time thoughts and improve my sleep. A real quality product.

    Richard G.Verified Buyer
  • 2 months ago

    Great product

    Amazing

    Arent J.Verified Buyer
  • 4 months ago

    Reliable and fast delivery great quality 👍

    EVerified Buyer
  • 5 months ago

    Very good product

    Very good product

    Paul G.Verified Buyer

The Healf Promise

Rated 4.8 (Excellent) based on 13,000+ reviews on Trustpilot

Dillon Jagatia

A comprehensive approach to wellbeing

Healf has impressed me with its comprehensive approach to wellbeing. Their commitment to natural ingredients and cutting-edge technology is evident. From vitamins and supplements to healthy snacks and cooking essentials, they've curated a diverse range of options to cater to various health needs.

Jesse Hansen-Bartel

Top-tier products

If you're serious about wellbeing, you need Healf. Their products are top-tier and the customer service team has been super attentive!

Mayah

One of the best wellbeing websites I've come across.

Healf is one of the best wellbeing websites I've come across. It's nice to know that they thoroughly check the products they sell so you know you are getting good quality stuff. Highly recommend.

Lydia Free

The best wellbeing website…

The best health and wellbeing website in the UK. The range of products is fantastic, even on hard to reach USA products. I love the subscription service too. I'd be lost without this website.

Alex

Amazing!

Healf isn't just another wellbeing brand. They really get it. The products are fantastic, and the support is always so personal and genuine!

Janet

Great products, service, and customer support

Healf have a great range of wellbeing products not available elsewhere in the UK. They are competitively priced as one-off, but even better if you take up the 'subscription' which is super flexible too. I'd have no hesitation in recommending Healf.

S Jones

I love Healf

It's the only place I get really decent health and wellbeing brands, particularly US brands. I've bought a Pvolve set, lots of Skinny Confidential stuff, Thorne supplements etc., the really great stuff that's impossible to get otherwise.

Dillon Jagatia

A comprehensive approach to wellbeing

Healf has impressed me with its comprehensive approach to wellbeing. Their commitment to natural ingredients and cutting-edge technology is evident. From vitamins and supplements to healthy snacks and cooking essentials, they've curated a diverse range of options to cater to various health needs.

Jesse Hansen-Bartel

Top-tier products

If you're serious about wellbeing, you need Healf. Their products are top-tier and the customer service team has been super attentive!

Mayah

One of the best wellbeing websites I've come across.

Healf is one of the best wellbeing websites I've come across. It's nice to know that they thoroughly check the products they sell so you know you are getting good quality stuff. Highly recommend.

Lydia Free

The best wellbeing website…

The best health and wellbeing website in the UK. The range of products is fantastic, even on hard to reach USA products. I love the subscription service too. I'd be lost without this website.

Alex

Amazing!

Healf isn't just another wellbeing brand. They really get it. The products are fantastic, and the support is always so personal and genuine!

Janet

Great products, service, and customer support

Healf have a great range of wellbeing products not available elsewhere in the UK. They are competitively priced as one-off, but even better if you take up the 'subscription' which is super flexible too. I'd have no hesitation in recommending Healf.

S Jones

I love Healf

It's the only place I get really decent health and wellbeing brands, particularly US brands. I've bought a Pvolve set, lots of Skinny Confidential stuff, Thorne supplements etc., the really great stuff that's impossible to get otherwise.

Frequently asked questions

How do we curate our products?

Every product undergoes our Healf Curation Process. With it, you can shop confidently knowing that every item has been tried and tested before it reaches you. Our Healf Curation Process includes three key steps: Brand Discovery, Expert Validation, and Community Testing. Through these, we assess quality, ingredients, effectiveness, and more, ensuring that every product empowers your wellbeing.

Do you have resources on how to enhance wellbeing?

The Healf Source offers detailed insights into different aspects of wellbeing, as well as guidance, research, recipes, and more to help you invest in your personal wellbeing journey. You can also subscribe to our weekly newsletters for the latest updates at Healf and in the wellbeing industry. Subscribe via the sign-up block at the bottom of this page.


How can I find out more about the ingredients in a product?

We love people who check ingredients as carefully as we do, so you'll find detailed information about the ingredients used on every product page (where applicable). If you see something you'd like to flag with us or have additional questions, please don't hesitate to get in touch—we'd love to hear from you.

Healf Curation Process™

Every product undergoes our rigorous Healf Curation Process, ensuring you are always getting the best when it comes to your wellbeing.

Our approach keeps us at the forefront of wellbeing. With our global network of health professionals and AI-powered trend analysis, we curate the leading supplements, tools, and tech that pioneer the industry.

Each product at Healf is carefully examined by a panel of industry specialists—including dieticians, personal trainers, psychologists, and sleep experts—to ensure it meets our high standards for quality, efficacy, and ingredient formulations.

By collaborating with a dedicated group of customers who test and review each product, we ensure that only those truly beneficial to your wellbeing are offered here at Healf.