Biotherm - Do you want to know the secret of a healthy and luminous skin? Biosource tonic is an astringent lotion that minimizes pores and provides a deeper cleaning. Skin is toned, feels incredibly clean and fresh. Life Plankton ™ Technology. Trace mineral system (iron, zinc, copper, manganese, magnesium, sodium chloride and potassium chloride). Moisturizing agents. The Biosource range is a complete range of cleansing and make-up removers that makes cleansing a daily pleasure and a source of vitality for the skin. Each product in the Biosource range makes cleaning a daily sensory pleasure thanks to its light, melting textures and addictive fragrance. Designed to adapt to each skin type and the habits of each woman.