![]() The chart assumes you are wearing a t-shirt and shorts and are lying down.ģ. Use this chart to find your suggested daily sun exposure time (applies only between 10am and 2pm: if earlier or later, add half as much again). Next, does your skin contain some sun-protecting pigment (melanin) already? The darker your skin colour, the less vitamin D you will make (but you will be less likely to burn). This rule accounts for where you are in the world, the time of day and (of course) if the sun is actually shining! If it is hard to tell whether your shadow is taller than you, you don’t have to lie down on the ground or get out a tape measure…just use a stick held vertically on the ground, mark where the top of its shadow is and then lower the stick to the ground.Ģ. ![]() A good rule of thumb, therefore is: if your shadow is taller than your height you can’t make vitamin D from the sun. We can’t make vitamin D in the winter because the sun is at too low of an angle and the UVB rays are absorbed in the atmosphere. UVB rays are short and only reach the earth when the sun is directly above us. ![]() How long is your shadow? We make about 90% of our vitamin D from UVB sun exposure. ![]()
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