L-Theanine

L-Theanine is available in various pharmaceutical forms, the most common being capsules. In addition to capsules, L-Theanine can also be found in tablet or ampoule form, each form having high bioavailability.

L-Theanine from Zenyth contains green tea extract standardised to 98% L-Theanine and is a 100% natural dietary supplement suitable for vegetarians and vegans. Other manufacturers - Secom, Genius Nutrition, GNC, Solgar, Pro Nutrition, etc.

L-Theanine is recommended for a variety of therapeutic applications, being used as an adjuvant in maintaining neuropsychological homeostasis. Its main indications include:

• Reducing stress and anxiety – By promoting the synthesis of GABA and serotonin, L-Theanine facilitates a state of inner calm, helping to effectively manage episodes of psychological tension.
• Increased concentration and memory capacity – Neurophysiological studies suggest that this amino acid positively influences alpha brain wave activity, promoting states of optimal alertness without hyperactivity.
• Supports cognitive activity – Regular administration of L-Theanine can enhance mental clarity and is frequently used by professionals who face complex tasks that require increased analytical thinking.

The administration of L-Theanine depends on individual needs and the purpose for which it is used.

In general, the recommended dose is 100-200 mg per day, administered in capsule form, preferably with meals to optimise absorption. Depending on the desired effects, 1-2 capsules per day can be taken, and in specific cases, on the recommendation of a specialist, the dose may be adjusted.

L-Theanine should not be taken in the following situations:

• Hypersensitivity to any of the ingredients;
• Children, pregnant or breastfeeding women, without medical advice;

If you suffer from severe chronic diseases, it is advisable to seek medical advice before taking this food supplement.

One of the advantages of L-Theanine is that it induces a state of calm without a sedative effect. Compared to other supplements designed to reduce stress, it does not affect alertness or cognitive performance.

As a product containing ingredients of natural origin, it is not standardised in terms of organoleptic properties. Therefore, variations in colour, smell or appearance may occur from one batch to another, without affecting the efficacy or safety of the product.

L-Theanine is well tolerated by most users. However, side effects such as headaches, dizziness, nausea, abdominal pain or irritability may rarely occur.

If these symptoms persist or worsen, it is recommended to discontinue use and consult a doctor.

L-Theanine may interact with:

• Antihypertensive medicines, enhancing their effect;
• Anxiolytic or sedative medicines, amplifying the sedative effect.

It is recommended to consult a specialist before taking L-Theanine to avoid possible interactions or undesirable effects.

To date, no severe cases of overdose with L-Theanine have been reported. However, taking an excessive dose may cause drowsiness or excessive lowering of blood pressure.

In case of accidental overdose, it is recommended that the patient consult a doctor immediately.

To maintain product stability, L-Theanine should be stored in its original packaging, in a dry place, away from light and heat. It is recommended to check the expiry date before use. Keep out of reach of children.

• PubMed, Effects of L-theanine administration on stress-related symptoms and cognitive function in healthy adults: A randomised controlled trial
• WebMD, Theanine
• Healthline, L-Theanine
• ScienceDirect, How L-theanine in tea reduces stress and anxiety