Sunburns are caused by UVB rays from the sun. While clouds block part of these rays, the actual quantity of blocked rays depends on the type of cloud, the altitude you’re at, and the time of year. What’s more, clouds block very few UVA rays, which is the type of radiation responsible for premature skin aging and which also contributes to the risk of skin cancer.
The UV index can help you determine the intensity of the sun’s rays and the recommended skin protection measures you should take. Consult weather reports for the UV index, and protect your skin from harmful rays as soon as it hits 3 or higher.
Tanning beds are no safer than sunlight. In fact, studies have shown that using tanning beds increases the risk of melanoma, the deadliest form of skin cancer. The intensity of some tanning beds can actually be three to five times higher than that of the sun’s rays at noon. UVA (and sometimes UVB) rays emitted by tanning beds are no less dangerous for your skin than those emitted by the sun.
A foundation with a sun protection factor (SPF) of 50 will provide effective protection for approximately 2 hours of sun exposure, but you will need to reapply if you stay out in the sun any longer than that. No product provides all-day protection, regardless of the SPF.
Dark skin naturally contains large amounts of melanin, which allows it to block part, but not all, of the sun’s rays. People with dark skin—and those who tan easily—are therefore not immune from the harmful effects of repeated or prolonged exposure to the sun. Contrary to popular belief, the skin does not get used to the effect of the sun.
Your body needs about 20 minutes of exposure to the sun on an area equivalent to your face and hands to produce enough vitamin D to meet your daily needs. The skin does not need to change colour for this reaction to occur.
The use of sunscreen can reduce the skin’s ability to produce vitamin D. However, Health Canada considers that it is more important that you protect your skin against the damage caused by the sun, especially since it is possible to meet your vitamin D requirements through your diet or by taking a supplement. Your pharmacist can help you determine whether you need a supplement.
If you have questions or concerns about the effect of sun exposure on your health, talk to your pharmacist.
The information contained herein is provided for informational purposes only and is not intended to provide complete information on the subject matter or to replace the advice of a health professional. This information does not constitute medical consultation, diagnosis or opinion and should not be interpreted as such. Please consult your health care provider if you have any questions about your health, medications or treatment.