Nioxin System 4 Scalp and Hair Thickening Serum Treatment is a targeted solution for improving hair density and scalp health. This 100 ml serum is designed to strengthen thinning hair and promote a fuller, thicker appearance. Ideal for those looking to enhance hair resilience, it delivers essential nutrients to the scalp and hair follicles. The lightweight formula absorbs quickly without leaving any residue, making it perfect for daily use. As part of the proven Nioxin series, this treatment supports overall hair vitality for a more voluminous look. Suitable for all hair types, it seamlessly integrates into your hair care routine.