L-Theanine Capsules. Zen in a Capsule. Unwind After a Long Day

Updated: 1/15/24

After those long workdays filled with deadlines, Zoom meetings, and more screens than you can count, unwinding can feel next to impossible. Your mind is racing with thoughts of everything you have to do, the constant stress and anxiety starting to wear you down. As the sun goes down, you hope for calm and relaxation but often find yourself unable to stop thinking about the day. What if there was a natural way to help you transition from a busy day into a restful evening? An easy and effective supplement that could help ease your frenzied mind, relax your body, and allow you to peacefully slip into rest? Read on to learn about L-Theanine capsules – nature’s answer for finding your zen after a hectic day.

What is L-Theanine?

L-Theanine is a natural compound found in tea leaves, particularly in green and black tea. It is considered a non-protein amino acid because it doesn’t contribute to the formation of proteins in the body, but it can still provide several benefits.

One of the most well-known benefits of L-Theanine is its ability to promote relaxation without causing drowsiness. This is because L-Theanine increases the alpha waves in the brain, which are associated with a relaxed and alert state of mind. This is a great option for anyone who wants to reduce stress and improve focus, especially those who cannot tolerate the stimulating effects of caffeine.

Studies show it affects the levels of various neurotransmitters, including GABA, dopamine, and serotonin. GABA (gamma-aminobutyric acid) is a neurotransmitter that helps to regulate anxiety and promote relaxation, and L-Theanine has been shown to increase GABA levels in the brain. Dopamine and serotonin are two other neurotransmitters that play a role in mood regulation, and L-Theanine may help to support healthy levels of these as well.

History of L-Theanine

Tea has been around for thousands of years, but it wasn’t until modern times that scientists discovered the unique properties of L-Theanine. In the 1940s, L-Theanine was first isolating from green tea leaves by Japanese scientists, who were intrigued by the relaxation and concentration benefits experienced by tea drinkers. Since then, L-Theanine has been the subject of numerous studies and grew in popularity as a dietary supplement.

In Japan, tea drinking is a deeply ingrained cultural practice that has been around for centuries. The Japanese have long in belief that tea has a calming effect on the body and mind, and that L-Theanine is responsible for this effect. In fact, green tea is often consumed before meditation or other calming practices to achieve a deeper state of relaxation. L-Theanine is also in other traditional foods in Japan, such as mushrooms and certain types of seaweed.

Benefits of L-Theanine Capsules

May Reduce Stress and Anxiety

One of the most famous benefits of L-theanine is its ability to help reduce stress and anxiety. The amino acid is believed to stimulate the production of alpha waves in the brain, which can promote a sense of calmness and relaxation. Alpha waves are with a state of mindfulness and show to decrease anxiety levels in several studies.

May Improve Sleep

If you’re struggling to fall asleep or stay asleep at night, L-theanine might be able to help. Studies show that L-theanine can improve the quality of sleep by promoting relaxation and reducing stress levels. So if you’re looking for a natural way to get better sleep, consider giving L-theanine a try.

May Boost Focus and Mental Clarity

L-theanine can also help improve focus and mental clarity. The amino acid shows to increase alpha waves in the brain, which are associated with a state of wakeful relaxation. In other words, L-theanine can help you stay alert and focused without feeling jittery or anxious.

May Lower Blood Pressure

High blood pressure is a common condition that can increase the risk of heart disease, stroke, and other health problems. But studies have found that taking L-Theanine supplements may help lower blood pressure levels, especially in people with hypertension. According to a study, L-Theanine supplementation was associated with a decrease in both systolic and diastolic blood pressure, as well as a reduction in heart rate. Additionally, L-Theanine may also improve arterial stiffness, which can further reduce the risk of cardiovascular disease.

May Ease PMS Symptoms

Many women suffer from premenstrual syndrome (PMS), which can cause a range of physical and emotional symptoms, including cramps, bloating, irritability, and mood swings. Research suggests that L-Theanine can help alleviate some of these symptoms. A study found that women who took L-Theanine supplements experienced fewer symptoms of PMS, including reduced physical discomfort and improved cognitive functioning. The study also concluded that L-Theanine may help regulate the balance of hormones in the body, which could contribute to its effectiveness in alleviating PMS symptoms.

May Provide Cognitive Support

L-Theanine shows to have a positive impact on cognitive function, including improved attention and memory. This is due to its ability to increase alpha wave activity in the brain, which is associated with relaxation and mental focus. By taking L-Theanine, you may find that you’re able to concentrate better and remember things more easily.

May Enhance Immune Function

L-theanine has also been shown to have immune-boosting properties. Research finds that L-theanine can increase the production of certain immune cells, such as T cells and IgA antibodies, which can help improve your body’s ability to fight off infections and diseases.

May Reduce Cardiovascular Risk

Another potential benefit of L-theanine is its ability to reduce cardiovascular risk. Studies show that the amino acid can help lower blood pressure and reduce cholesterol levels, both of which are risk factors for heart disease. So if you’re looking to improve your heart health, L-theanine might be a good supplement to consider.

L-Theanine Capsules Side Effects


One of the most common L-Theanine side effects is headaches. Some users experience mild to moderate headaches when they first start using L-Theanine, but these usually go away quickly. If you experience severe headaches or migraines, however, you should discontinue use and consult with your healthcare provider.


Another potential side effect of L-Theanine is nausea. This is more common in higher doses, so you should start with a small amount and increase slowly to avoid this side effect. If you do experience nausea, try reducing your dose or taking it with food.

Gastrointestinal Issues

Some people may experience gastrointestinal issues when taking L-Theanine supplements. While it is rare, those who already have a sensitive stomach may experience nausea, upset stomach, or diarrhea.

Lowered Blood Pressure

L-Theanine shows to lower blood pressure in some users, which may be desirable for those with high blood pressure. However, if you already have low blood pressure, L-Theanine may cause it to drop too low. If you experience dizziness or lightheadedness after taking L-Theanine, you should stop using it and consult with your healthcare provider.

Allergic Reactions

Finally, some people may be allergic to L-Theanine. If you experience any signs of an allergic reaction, such as hives, difficulty breathing, or swelling of the face, lips, tongue, or throat, seek medical attention immediately.

Interactions With Other Medications

L-Theanine may interact with certain medications, particularly those that affect the central nervous system. If you are taking any medications, be sure to talk to your healthcare provider before adding L-Theanine to your routine.

Where to Buy L-Theanine Capsules?

You can purchase L-Theanine Capsules at BulkSupplements.com. The company is an industry-leading manufacturer and distributor of pure dietary supplements. BulkSupplements.com is not just a consumer brand. It also supplies pure ingredients to other brands that distribute food and other supplement products. All products at BulkSupplements.com are manufactured and tested according to current and proper manufacturing practices.

Do you share an interest in trying L-Theanine as a dietary capsule supplement for its potential to support your central nervous system, weight loss program, immunity function, metabolic health, cardiovascular health, and cancer prevention? Contact BulkSupplements.com to place an order today.


L-Theanine Dosage

There is about one to two percent of L-theanine by dry weight of green tea leaves. Likewise, you can get approximately 25 to 60 mg of L-theanine in a cup of tea. Fifty mg of L-theanine a day produces noticeable mental alertness. However, if you need a more precise and larger dose, that requires taking capsules instead of tea.

L-theanine capsules average 200 to 500 mg per unit. You’ll have to see how your body adjusts to the different dosages. You can also talk with a healthcare provider and come up with a regiment that suits your needs.

The Bottom Line

L-Theanine is a powerful amino acid that has numerous benefits for our health and well-being. From reducing stress and anxiety to improving cognitive function and boosting the immune system, L-Theanine is a must-have supplement for anyone with interest in optimizing their health. So why not give L-Theanine a try and experience its amazing benefits for yourself? With so many benefits, it’s no wonder that L-Theanine is becoming more and more popular among health-conscious individuals.

L-Theanine capsules have many wonderful benefits, but as with any supplement, there is the possibility of side effects. It’s important to educate yourself on the possible side effects of L-Theanine. Consult with your doctor if you have any concerns. Remember, if you experience any adverse effects or are unsure if L-Theanine is right for you, it is always better to be safe than sorry. Keep calm and make wise decisions.

These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.

Author: BulkSupplements Staff