What is zinc oxide exactly?

Zinc oxide is a natural product (oxidized zinc) that is widely used in sunscreens or day creams with a protection factor, because it naturally protects against the sun. However, most manufacturers use zinc oxide that is so highly refined (to nano-particles), that it can enter the bloodstream through the skin, which is undesirable. Also, the zinc particles are then often coated with a layer of silicone, which can be harmful in combination with exposure to sunlight. Non-nano, uncoated zinc oxide is completely safe for use and an excellent ingredient for homemade, natural sunscreens.

How do I use zinc oxide?

Before you start working with zinc oxide, read the following text carefully:

Zinc oxide is a fine white powder and is otherwise safe for use, but can irritate the airways if it is inhaled. Therefore it is wise if you are going to make a sunscreen yourself to for example tie a t-shirt around your mouth/nose while you are working. Also important is that you do NOT mix the zinc oxide with linseed oil. Linseed oil reacts with zinc oxide causing heating and this can be dangerous.