Green tea extract

What is green tea extract?

Green tea extract is a concentrated substance derived from the leaves of the green tea plant (Camellia sinensis). Unlike black tea, green tea is not fermented, which preserves the highest amount of active polyphenols.

Key components:

• Catechins: antioxidants, the most important of which is EGCG (epigallocatechin gallate).
• Caffeine: a natural stimulant that promotes alertness.
• L-theanine: an amino acid with calming and focus-enhancing effects.

Source of antioxidants

EGCG – epigallocatechin gallate – found in green tea is a polyphenol compound belonging to the class of catechins. It is one of the strongest natural antioxidants.

Antioxidants neutralize free radicals – unstable molecules that can damage cells, proteins, DNA, thus promoting aging and various diseases. EGCG helps maintain the body's antioxidant balance.

Why use extract instead of plain tea?

The amount of EGCG in a cup of green tea varies greatly (depending on the type of tea, preparation method, and temperature). Supplement form allows for a precisely standardized amount of EGCG – usually 45-55% of the catechins contained in the capsule.

How does green tea extract work?

The effects of green tea extract are related to several key mechanisms:

Antioxidant and anti-inflammatory effects

EGCG reduces oxidative stress, neutralizes free radicals, and can inhibit the activity of inflammatory molecules (cytokines). This is important not only for overall health maintenance but also for the prevention of chronic diseases.

Thermogenesis and fat oxidation

EGCG, together with caffeine, increases thermogenesis – heat production by burning calories. It also promotes fat oxidation, where fats are more effectively used for energy rather than stored in adipose tissue.

Vascular function and lipid profile

Studies show that green tea extract can reduce the oxidation of "bad" cholesterol (LDL) and increase vascular elasticity, thereby contributing to cardiovascular health.

Influence on brain activity

Caffeine and L-theanine in green tea work together: caffeine stimulates, while L-theanine calms and improves concentration. This combination helps maintain alertness without the "jitters" often felt after coffee.

Benefits of green tea extract

Weight management

Green tea extract increases energy expenditure (~3–4% per day), helps use fat more effectively during workouts, and can reduce appetite.

Cardiovascular health

Reduces LDL cholesterol oxidation, may help regulate blood pressure, and maintains vascular elasticity.

Energy and alertness

The combination of caffeine and L-theanine provides a milder energy boost than coffee. Green tea extract also supports concentration and reduces fatigue.

Antioxidant protection

Helps combat oxidative stress and supports skin health, potentially slowing down aging processes.

Potential neuroprotective effect

Some studies suggest that EGCG may have a protective effect on brain cells and help maintain memory and cognitive functions.

Dosage and use

Typical doses: supplements usually contain 250–500 mg of EGCG per day.

Take in the morning or before a workout. Not recommended for evening use, as the extract contains caffeine.

Can be taken with food or on an empty stomach – this depends on individual tolerance. A break is recommended after an 8-12 week course.

Green tea extract is generally safe, but:

• Excessive caffeine intake can cause insomnia, anxiety, and heart palpitations.
• It is not recommended to take it with iron supplements, as it may reduce iron absorption.
• Pregnant and breastfeeding women should consult a doctor.

Who should choose green tea extract?

• Those who want to support weight management along with diet and physical activity.
• Individuals seeking more energy and alertness without strong stimulants.
• People who want to strengthen cardiovascular health.
• Those who do not drink green tea but want to obtain its active ingredients.

Green tea extract is a natural, scientifically studied supplement rich in antioxidants that help protect the body from oxidative stress, support heart health, and provide more energy.

The extract can be a useful aid for weight loss, especially when combined with other supplements and a healthy lifestyle. The most important thing is to choose quality, standardized products, adhere to recommended dosages, and remember that diet and activity always form the foundation.