High-end grade. Collagen hydrotherapy injections generally cost 7,000-9,000 yuan. The specific price depends on the dose of collagen hydromassage that needs to be injected into your facial skin. It is a high-end grade. The functions of collagen water light injection are usually whitening, increasing skin elasticity and helping to improve minor facial wrinkles. One injection can achieve the dual effects of replenishing hyaluronic acid and collagen.