Biotherm has studied the skin's biology for over 50 years. The result: innovative and effective skincare solutions. At the core of Biotherm skin care products is a micro-organism found in thermal spring water, Pure Thermal Plankton (PTP). PTP is rich in trace elements and minerals that combine to renew and soothe the skin. According to recent research, PTP helps protect against visible ageing due to external aggressions, by stimulating the skin's natural defences – just like a probiotic for the skin. Biotherm ranges include Aquasource, Biopur, Age Fitness Power2, Celluli Laser, Biosource, Skin Vivo and White D-Tox.