Thin or fragile hair is more prone to breakage and can struggle to maintain density and volume. The Redken Acidic Grow Full System Hair Serum delivers concentrated strengthening benefits directly to the hair fibre, improving resilience and supporting long-term growth. Its lightweight, non-greasy formula absorbs quickly without weighing hair down, leaving hair smoother, shinier, and more manageable. Regular use helps protect against future breakage, enhance hair strength, and promote the appearance of thicker, denser hair, perfect for anyone looking to boost fullness and maintain healthy, resilient hair from root to tip.