SunTheanine Reviews – Does This Product Really Work?

4.3/ 5.0

Suntheanine is an l-theanine supplement that is formulated to improve concentration, mental clarity, and relaxation.


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Overview Of SunTheanine

According to the brand, Suntheanine is a dietary supplement that is formulated to be a pure form of l-theanine and intended for use by those looking to improve their mental clarity, focus, and rest for better study, productivity, and quality sleep without feeling groggy.

The ingredient is said to be derived from green tea and is made through a proprietary enzymatic process for optimum quality. The product is sold on the official website and retail stores online and within the price range of many similar l-theanine supplements.

In this Suntheanine article, we will discuss all you should know about the supplement including details, such as the claims, the ingredients, manufacturer details, pricing, pros, cons of usage, and possible side effects from use.

We’ll also discuss SunTheanine Reviews, the positives, and the negatives. Had any experience with this l-theanine product? Let us know how it worked for you in the comments below.

How Does SunTheanine Work?
SunTheanine is claimed to contain pure l-theanine, known and used in supplements for mental health for its supposed ability to improve mental alertness, focus, and rest without any of the side effects of some nootropic ingredients.

The brand claims that when used as directed, the product may improve sleep quality, promote learning, enhance concentration, and lessen memory decline while also boosting the immune and overall health for better performance in all areas.

It is also claimed to be able to reduce the possible adverse reactions from caffeine and is suitable for students and workers looking to improve their productivity with a natural formula for brain health.

Who Is The Manufacturer Of SunTheanine?

SunTheanine is produced by Natural Factors, a brand based in the United States and established in the 1950s. The company makes a wide range of products that are claimed to be formulated using only the best quality ingredients from their farm and following Good Manufacturing Practice guidelines for quality and hygiene purposes.

Like SunTheanine, the products are sold on the brand’s official website and retail stores online and are within the price range of some similar formulas.

On review and retails sites where Natural Factors products are sold, they enjoy many positive reviews from buyers who said they liked the quality and affordability of the products.


SunTheanine Review – Health Web Magazine Images

What Are The Ingredients In SunTheanine?

Here are some of the active ingredients of SunTheanine:

L-theanine – L-theanine [1] is a main ingredient in formulations for brain health and wellness. It is an amino acid extracted from tea that has been shown to hold brain-supporting qualities in many studies.

Clinical research on its effect on the brain and performance have shown that inadequate amounts, l-theanine may stimulate alpha brain waves, improve mental calmness, relaxation, and cognitive performance.

The brand claims that the extract used in the formula was produced via a proprietary enzymatic process to ensure pureness for more ability.

The Science Behind SunTheanine

SunTheanine is said to be manufactured with l-theanine, an amino acid derived from green tea. According to the brand, to ensure pureness and maximum quality, this key ingredient was extracted via an enzymatic process.

Like in SunTheanine, l-theanine is commonly used in formulations for brain health for its ability to stimulate alpha waves in the brain and enhance mental performance, heighten concentration, boost learning and productivity. It is also added for its calming effects against caffeine jitters, nervousness, and other benefits.

However, like many supplements, SunTheanine may not work as claimed for all. Even though it is widely studied and has been proven in many of these studies to indeed hold brain health-improving benefits.

What Are The Benefits Of SunTheanine?

  • It contains a known and researched ingredient.
  • The product may improve mental performance and productivity.
  • SunTheanine could help promote rest and sleep.
  • A known brand manufactures SunTheanine.

What Are The Drawbacks Of SunTheanine?

  • The brand does not offer free trial pills for the customers.
  • SunTheanine may only be purchased online, not locally.
  • It may not work as claimed for all users.
  • There are no independent studies that have been carried out on the product.

FAQs: Consumer Questions & Answers

In our research for this report, we found that consumers are frequently asking the following questions online in regard to SunTheanine.

Unless otherwise advised by a health professional, the product may not be used by pregnant and nursing women, people younger than 18, and those on prescription medications.

SunTheanine should be kept away from the reach of young children and medical attention provided if side effects are experienced from use.

SunTheanine is competitively priced like many l-theanine supplements and nootropics. Pricing may however differ slightly from retailer to retailer.

The brand recommends taking 1-2 tablets thrice daily or as recommended by your health professional.

No free trials are offered by the brand. The refund policy is dependent on the retailer. Buyers are to confirm their retailer’s exact return/refund policy before purchase.

The product contains l-theanine, a key ingredient in many nootropics and wellness products. It is also within the same price range and like these products, the results may vary from user to user.

Some of the side effects that may be experienced from the product include nausea, diarrhea, vomiting, headache, irritability, and liver dysfunction with long-term use.

You decide. It contains a key ingredient that is supposedly a pure form of l-theanine and is within the price range of many similar formulas.

What Are Consumers Saying About Total Restore?

SunTheanine Reviews have been quite fair. While some users complained about the product not working as claimed for them and about some of the minor side effects, many reviewed the product positively for the improvements they experienced in their cognitive performance, rest, and overall health.

Depression and anxiety are common disorders that can make daily tasks extremely challenging. Some estimates allege that approximately one in ten Americans suffer from some level of depression and/or anxiety. Symptoms of anxiety and depression include ongoing feelings of sadness accompanied by unease, irritability, tension, and nervousness. While some people require medication to deal with these occasionally crippling symptoms, others may find an all-natural product helpful. An all natural relaxation supplement should promote healthy neurological function. All ingredients should be clinically proven to reduce feelings of anxiousness, sadness, unease, irritability, tension, and nervousness.

Below you'll find some of the most effective natural nervousness relief supplements on the market today, in our opinion.

Rating Table Rating Table

Our Top Products

Try it now
Serelax Serelax Rating
#1 Serelax
  • Quality of Ingredients*
  • Potential to Improve Sleep Pattern*
  • Relieve Feelings of Stress & Anxiety*
  • Supports Mental Focus & Clarity*
  • Induce Calmness & Tranquility*


  • Quickly reduces anxiety and stress
  • 99% of testers found this product to be highly effective
  • Promotes relaxation and calmness
  • Improves feelings of emotional well-being
  • Boosts levels of mood-enhancing neurotransmitters
  • Prevents mood swings and reduces irritability
  • Elevates mental focus and attention
  • Supports better physical health and strengthens immunity
  • Improves overall quality of life
  • Offers a lengthy 60-day money-back guarantee
  • Includes safe ingredients with no artificial or chemical substances
  • Shipped in discrete, plain packaging
  • Customers are not required to sign up for an auto-shipping delivery plan


  • Not sold in any offline retail stores
  • Stock is low at times due to high demand

The Bottom Line

SereIax is a powerful, all-natural supplement that rapidly reduces feelings of anxiety and stress while promoting a feeling of greater calmness and emotional well-being.

Unlike some brands of stress relief supplements that only work on one or two issues, the comprehensive SereIax formula provides complete support with additional benefits for cognitive and physical health. It raises levels of key brain neurotransmitters to elevate the mood, promoting positivity and also improving concentration and mental clarity.



In consumer trials of a period of 4 weeks, 99% of testers reported that they were extremely satisfied with their results, noting that their anxiety levels decreased dramatically, and they felt overall happier. In addition to these incredible benefits, they had much more energy, got a better night’s sleep, and enjoyed enhanced focus and mental performance. It should also be noted, that SereIax produces all these incredible benefits without ever causing harmful side effects or becoming addictive.

The manufacturer of SereIax offers a solid, no-hassle money-back guarantee of 60 days and ships the product discreetly for customer privacy. After seeing its fast-acting results for ourselves, we’re certain that anyone trying this product will be as impressed as we are and within no time enjoy a better quality of life free from stress and anxiety.

ZemBright Mood Plus
#2 ZemBright Mood Plus
  • Quality of Ingredients*
  • Potential to Improve Sleep Pattern*
  • Relieve Feelings of Stress & Anxiety*
  • Supports Mental Focus & Clarity*
  • Induce Calmness & Tranquility*


  • ZemBright Mood Plus contains the patented substance Zembrin
  • Customer reviews are provided


  • Free samples are not supplied

The Bottom Line

While there is definitely a link between cortisol levels and stress, it is not clear exactly how well natural supplements such as ZemBright Mood Plus can work, especially if the stress and anxiety are severe. In terms of cognitive function support, the formula contains none of the most commonly-used ingredients usually found in such products such as Phosphatidylserine or Huperzine, although judging from the clinical testing performed on Zembrin, it does appear to have positive effects in the areas of cognitive flexibility and processing speeds.

Brillia Review
#3 Brillia Review
  • Quality of Ingredients*
  • Potential to Improve Sleep Pattern*
  • Relieve Feelings of Stress & Anxiety*
  • Supports Mental Focus & Clarity*
  • Induce Calmness & Tranquility*


  • Brillia Review full formula is listed
  • Information about the company is provided


  • Brillia Review price is not published
  • No customer testimonials are shown

The Bottom Line

Brillia Review seems to be a reasonably beneficial product given the type of ingredients used in the formula and the fact that it is made by an established and trusted company. It would be helpful to see a few more details of this anxiey relief supplement in terms of clinical testing studies and data and also some first-hand customer reviews and ratings.

Dietary supplement recommendations can be found everywhere — in commercials, through social media influencers, and from your neighbors, friends, and family. With so many different opinions, it can be hard to know which supplement is right for you. While most quality supplements undoubtedly provide health benefits, each will work in its own unique way, so it's important to determine which one will help you reach your health goals. Below you will find our subjective assessment of SunTheanine based on the information available to us and our estimation of its overall efficacy.

  • Quality of Ingredients*
  • Potential to Improve Sleep Pattern*
  • Relieve Feelings of Stress & Anxiety*
  • Supports Mental Focus & Clarity*
  • Induce Calmness & Tranquility*

Overall Rating

Try It

SereIax - A Better Alternative?

Quality of Ingredients*
Potential to Improve Sleep Pattern*
Relieve Feelings of Stress & Anxiety*
Supports Mental Focus & Clarity*
Induce Calmness & Tranquility*

SereIax is a potent stress relief supplement that reduces stress and boosts mood by 96% in just 7 days!

The SereIax all-natural, maximum strength formula works quickly and safely, never causing harmful side effects or creating a dependency. Its powerful blend of clinically proven ingredients promotes relaxation, relieves anxiety, and enhances feelings of positivity.

You can find out more about SereIax by reading our full review below.

Read More About SereIax Nowarrow

Final Words

SunTheanine is a supplement by Natural Factors that are designed to improve brain health and performance, productivity, and rest. It contains l-theanine, a supplement known to improve cognitive function and overall health. SunTheanine Reviews on their part have been fair.

Before trying the supplement, assess factors such as the possible side effects like nausea, diarrhea, vomiting, headache, irritability, and liver dysfunction with long-term use, and the lack of clinical trials.

Also consider the pros of the product, its manufacturer, as well as the feedback from previous buyers. The brand does not offer free trial pills for the customers. So, we would recommend consulting your healthcare provider and perhaps look for similar products of the same kind.

**The above is a subjective review. Our opinion of the product’s efficacy was based on independent research and information. *Results from using this product may vary. If you have a serious medical condition, a history of heart conditions, are pregnant or nursing, we recommend that you speak to your healthcare provider before using this, or any other health product and/ or supplement. The content provided on Health Web Magazine is only intended for your informational purposes and should not be regarded as a substitute for advice from a healthcare professional. It should not be used to diagnose, treat, cure, or prevent any health condition, and we will not be held responsible for any complications that may arise from you using it for any of those aforementioned reasons. All concerns regarding your personal health must be dealt with directly by your healthcare provider.

Disclosure of Material Connection : Products shown in the section titled ‘Our Top Products’ are those that we promote as the owner and/ or reseller and does not represent all products currently on the market or companies manufacturing such products. This information is disclosed in accordance with the Federal Trade Commission’s 16 CFR, Part 255 “Guides Concerning the Use of Endorsements and Testimonials”. We would like to make it clear that any and all links featured in this section are sales links; whenever a purchase is made via one of these links, we will receive compensation.

*Result may vary. If you are pregnant, nursing, have a serious medical condition, or have a history of heart conditions we suggest consulting with a physician before using any supplement. The information contained in this website is provided for general informational purposes only. It is not intended to diagnose, treat, cure, or prevent any disease and should not be relied upon as a medical advice. Always consult your doctor before using any supplements.

† Based on an internal customer response survey of subgroups of individuals. This is a subjective survey and in no way should it be intended to be interpreted as a clinical study. Results may vary.


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