The Hair Filler + Vitamin Cg Sulfate-Free Serum is formulated with vitamin Cg, citric acid, and repair care complex. This system fills weak, damaged hair with strength 7 layers deep for inner fiber repair, outer visible transformation. Use this serum as step 4 in the 4-step system to revitalize the hair.Inner fiber repair: Repairs and strengthens broken bonds deep in the cortex, hair fiber's inner layer*. Outer visible transformation: Up to 79% more strength with up to 4x less breakage**. Get visibly smooth and healthy-looking hair.Formulated without sulfates, silicones, parabens, phthalates, DMDM hydantoin, and mineral oil. All Garnier products, globally, are officially approved by Cruelty Free International under the Leaping Bunny Program.*with continuous use of the system (Inner Fiber Repair Treatment and Strength Repair Shampoo, Conditioner, and Serum)**with use of the system vs. non-conditioning shampooBENEFITSINTENSIVE REPAIR & STRENGTHENING: This shampoo for weak, damaged hair with Vitamin Cg + Citric Acid + Repair Care Complex, fills hair with strength 7 layers deep for inner fiber repair, outer visible transformation.ENRICHED WITH KEY INGREDIENTS: Formulated with Vitamin Cg, citric acid, and a repair care complex, it helps to rebuild broken bonds deep within the cortex, the inner layer of the hair fiber, resulting in up to 79% more strength and significantly less breakage.DEEP FIBER REPAIR: The formula repairs and strengthens broken bonds deep in the cortex, the inner layer of the hair fiber, enhancing the overall strength and resilience of the hair.SULFATE-FREE & FREE FROM HARSH ADDITIVES: The product is made without sulfates, silicones, parabens, phthalates, DMDM hydantoin, and mineral oil, catering to consumers seeking hair care products with cleaner ingredient profiles.ETHICAL CONSIDERATIONS: All Garnier products, including this shampoo, are approved by Cruelty Free International under the Leaping Bunny program. Moreover, the product is vegan with no animal-derived ingredients.HOW TO USE4-STEP STRENGTH REPAIR SYSTEM: STEP 1 (REBOND): Apply Bonding Inner Fiber Repair Pre-Shampoo Treatment and leave on for 5 minutes. Rinse. STEP 2 (RESTORE): Apply Strength Repair Shampoo. Rinse.STEP 3 (REINFORCE): Apply Conditioner to wet hair. Rinse. STEP 4 (REVITALIZE): Apply Strength Repair Serum. Do not rinse.