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Stronger hair starts here. John Friedas PROfiller Strengthening Super Fluid is a science-backed, leave-in treatment for fine, thin hair that repairs, reinforces, and protects fragile strands from the inside out. It fortifies your hair with up to 10x more strength and reduces split ends by up to 99%. Formulated with a Protein Bond Complex, this treatment builds new bonds in the hair fibre, while Biotin and Hyaluronic Acid deliver hydration and resilience. Lightweight and non-greasy, it can be

