The Viviscal Hair Thickening Serum is a 50ml leave-in treatment formulated with active ingredients such as Keratin, Seaweed, Biotin, and Marine Collagen. This product is designed specifically for menopause-related hair loss, offering a targeted solution for thinning hair. With a formulation that includes Biotin, this serum is suitable for all hair types and provides nourishment to promote hair growth and thickness. Brand new unused. Part of a competition prize but not something I will use.