 ramp up innovation when it comes to sunscreen. Krista Marks reports. The last time the FDA approved any new active sunscreen ingredients was in 1999. Gottheimer also says health agencies need to provide more guidance on how to use it. It can be incredibly confusing to try to navigate all this stuff online. How much do you wear? When do you put it on? How frequently? He was joined by Englewood Health dermatologist Dr. Ali Hadi. People often ask me, do I need to use it on a cloudy day, on a rainy day? And the answer is yes, you do.