OLAPLEX OLAPLEX No.4 Strengthening Shampoo 525ml £52.00 Where to buy Compare prices from 2 retailers Prices sorted cheapest first. Retailer Price Boots.com £52.00 Let's Go Amazon £52.00 Let's Go Code copied Paste it at checkout. Exclusions may apply. Visit retailer Cancel About this product Olaplex No.4 Strengthening Shampoo, 525ml Browse related categories Best hair dye Best conditioner Best hair styling Back to all shampoo