Yes. At least when it's applied to the skin, hyaluronic acid can cause the body to make more of its own hyaluronic acid. There's some thinking that some receptors in the cells screen for levels of hyaluronic acid in the area. This can signal for new hyaluronic acid to be made. Also, when one of the sugar molecules that hyaluronic acid is composed of is clipped, this seems to lead to the creation of more hyaluronic acid.