L'Oréal styling products. ARGININA RESIST conditioner. L'Oréal Elvive Arginine Repair Conditioner. Thanks to the active ingredients of arginine (a type of amino acid), this conditioner will penetrate your hair, nourishing it and helping to restructure the hair fibers, and promoting their growth in a strong and healthy way. You will get your hair back to its strength and endurance like never before. Apply a small amount to all hair from tip to root and leave on for several minutes. Rinse with plenty of water.