These products give the skin colour. They are safe and do not harm the skin. These products do not protect the skin from sun damage, so sun protection must also be used as well (Canadian Dermatology Association (2006).
Some of these products combine self-tanning and sunscreen but read the label to be sure you are choosing a sunscreen with SPF 15 or higher that gives protection from both UVA & UVB rays. Look for a product with the Canadian Dermatology Association logo on it.