Part of the plant: leaves. Botanical name: camellia sinensis. Main properties: Two active ingredients present in tea leaves combine to fight against overweight and obesity. Slimming diets are most often accompanied by loss of fitness, but tea is a central nervous system stimulant. Scientific studies show that the antioxidant activity of green tea is linked to polyphenols. It is also known for its hepatoprotective, antimicrobial, angioprotective and anti-inflammatory action. It would act on the formation of “plaques” responsible for Alzheimer's disease, have a prophylactic action on arthritis, improve blood sugar levels and lower triglyceride levels. In cosmetics, it is used in anti-aging treatments, but also thanks to its astringent and softening properties, to regulate mixed skin.