Rinsing off magnesium oil or magnesium gel after use is a matter of personal preference, and depends on how much you apply and where it is applied on the body. Typically, the more magnesium oil or gel used per application, the higher likelihood you may prefer to rinse it off. In roughly twenty minutes your skin can take full advantage of topically applied magnesium, and it may be safely removed at that point. Keep in mind, also, that Ancient Minerals magnesium gel is designed not to be fully absorbed into the skin, so rinsing off after applying is a fairly common practice.
Please see our Magnesium Application and Usage Guide for more information.