Question: is hyaluronic acid a serum?
Answer: "Hyaluronic acid is an oil-free ingredient that works to replenish the skin's moisture as well as plumps and smooths the appearance of fine lines,” Batra explains. ... This hardworking serum is pricey, but is highly effective at restoring parched skin, says Dr. Howard Sobel, a board-certified dermatologist in NYC.