Not necessarily. It's going to depend on your age, skin color and skin condition as to whether a pill beats sun. But generally being outdoors, on a grey winter

Not necessarily. It's going to depend on your age, skin color and skin condition as to whether a pill beats sun. But generally being outdoors, on a grey winters day in the northern hemisphere, with just your face exposed, and having darker skin, for an hour, is not going to get you enough D.