Firming Serum Aquasource Biotherm Aquasource Aura Concentrate (50 ml) 50 ml is a quality product designed for discerning individuals who look after their appearance & are looking for the best cosmetics to enhance their beauty. If you are one of them, the 100% original Biotherm products are made for you.. Gender. Unisex. Lady. Capacity: 50 ml. Type. Highlighter. Serum. Properties. Free from parabenes. Moisturizing. Recommended use: All skin types