Know how to select and apply a good sunscreen to protect your skin from sunburn and other skin damage
Sunscreen absorbs, reflects or scatters UV light. It's divided into three wavelength bands — ultraviolet A (UVA), ultraviolet B (UVB) and ultraviolet C (UVC). Only UVA and UVB rays reach the earth.
Sunscreens provide either physical or chemical protection from UV light.
Physical sunscreens :
form an opaque film that reflects or scatters UV light before it can penetrate the skin. These sunscreens contain ingredients, such as zinc oxide and titanium dioxide, which protect against both UVA and UVB rays. Original formulations of physical sunscreens remained white when applied to the skin. Newer formulations blend more with your skin tone and are less noticeable.
Chemical sunscreens :
absorb UV rays before they can cause any damage. They contain one or more ingredients, such as avobenzone or oxybenzone, which absorb UVA or UVB rays. For broad protection, chemical sunscreens often contain more than one ingredient to protect against both UVA and UVB rays. A newer over-the-counter sunscreen contains mexoryl (Anthelios SX) and offers protection against both UVA and UVB radiation.
Be safe in the sun
Vitamin D
Vitamin D from the sun helps us absorb calcium and prevent osteoporosis (porous bones) - simply eating calcium-rich foods without the vitamin is not enough, as the calcium may end up depositing itself in areas other than the bones, which is not good news.
More evidence from researchers is showing an increased link between vitamin D from sunlight and the reduction in cancer risk. People who live in areas where there is more sun have reduced risk of breast and prostate cancer (IIAA Issue Autumn 2005). For more information on the correlation between vitamin D and cancer, read
here
In addition, researchers at Aberdeen University have revealed that lack of vitamin D from sunlight contributes to obesity. Vitamin D controls the hormone leptin which signals to the brain when you are full. They found that those who were obese had lower levels of vitamin D; in fact they produced a tenth less vitamin D than those of average weight.
Sunlight (or its ultraviolet component to be exact) is needed for the body to produce vitamin D, whose deficiency leads to bone loss, poor immunity and, possibly, increased cancer risk. Experts believe that adequate vitamin D status requires ten to fifteen minutes of sun exposure at least two times per week to the face, arms, hands, or back without sunscreen. Some people, especially those with darker skin or unusually low rate of skin synthesis of vitamin D, may require more. Furthermore, recent research indicates that vitamin D levels above what's minimally adequate may have various health and longevity benefits.
Avoid sunbeds
Topping up on a sunbed is not a good way to supplement your exposure. Sunbeds mostly block out the UVB rays but not the UVA rays, and it is the UVB that makes the vitamin D in your skin. All you’ll get from a sunbed is a tan and wrinkles as a result of the accelerated ageing from UVA.
SupplementsProtect yourself well on the inside as well as the outside. Build up your store of vitamins A and C by eating foods that are rich in these vitamins and other anti-oxidants, and apply skin products that have potent quantities of vitamins A, C and E, as these get destroyed by the sun so need replacing.
Source :
Mayo Clinic
SmartSkin
after my sister have been using it for almost 2 years. She have blemish-free and fair skin and of course, I wanted to try it out. 
