The Science Behind Sunscreen
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Sunscreen plays a crucial role in skincare by providing protection against the harmful effects of ultraviolet (UV) radiation from the sun. UV radiation is a known contributor to premature aging, skin damage, and an increased risk of skin cancer. Sunscreen works as a barrier, either absorbing, reflecting, or scattering UV rays, preventing them from penetrating the skin.
The science behind sunscreen involves active ingredients categorized into two types: chemical (organic) and physical (inorganic) filters. Chemical filters like avobenzone and octocrylene absorb UV rays, converting them into harmless heat. Physical filters, such as zinc oxide and titanium dioxide, act as a physical barrier, reflecting and scattering UV rays away from the skin.
The Sun Protection Factor (SPF) on sunscreen indicates its effectiveness in blocking UVB rays, responsible for sunburn. Broad-spectrum sunscreens protect against both UVB and UVA rays, the latter being associated with aging and skin cancer.
Daily sunscreen application is vital for maintaining healthy skin all your life. It’s obviously important for outdoor moments, and reapplication is priority as SPF protective effects can wear off or be diluted through activities like swimming or sweating. But, daily use of sunsceen, even when primarily indoors, is always a good idea. Here’s why.
Both UVA (Ultraviolet A) and UVB (Ultraviolet B) rays can penetrate through glass, although they do so to varying extents.
UVB Rays: These rays are responsible for causing sunburn and play a key role in the development of skin cancers. While most UVB radiation is blocked by standard window glass, some can still penetrate. This is why you can get sunburned through a window, especially if you spend extended periods near one.
UVA Rays: UVA rays, which contribute to premature aging and can also cause skin cancer, are not as effectively blocked by glass. UVA rays can penetrate through windows, making it important to use sunscreen even when indoors, particularly if you are exposed to sunlight through glass for extended periods.
It's worth noting that protecting your skin from UV radiation is essential both indoors and outdoors. Using broad-spectrum sunscreen, even on cloudy days or when staying indoors, is a crucial step in preventing skin damage caused by UVA and UVB rays.
In addition to preventing sunburn, sunscreen helps maintain skin health, prevents hyperpigmentation, and reduces the risk of skin cancer. Incorporating sunscreen into a daily skincare routine is a fundamental step in preserving the skin's youthful appearance and safeguarding its long-term health.
Bottom line: use a broad spectrum SPF daily! Here are my top SPF recommendations:
EltaMD UV Clear Facial Sunscreen SPF 46: This oil-free sunscreen is formulated with niacinamide and hyaluronic acid to calm and hydrate the skin while providing broad-spectrum protection against UVA and UVB rays. It is suitable for sensitive or acne-prone skin. Get this product!
La Roche-Posay Anthelios Melt-in Milk Sunscreen SPF 100: This lightweight, fast-absorbing sunscreen offers high-level protection against both UVA and UVB rays. It contains the brand's patented Cell-Ox Shield technology and is suitable for all skin types, including sensitive skin. Get this product!
Supergoop! Unseen Sunscreen SPF 40: This invisible, weightless sunscreen is perfect for daily wear under makeup. It provides broad-spectrum protection without leaving a greasy or sticky residue and is formulated with antioxidants to defend against environmental stressors. Get this product!
CeraVe Hydrating Mineral Sunscreen SPF 30: This mineral sunscreen contains zinc oxide and titanium dioxide to provide gentle yet effective protection against UV rays. It also contains ceramides and hyaluronic acid to hydrate and replenish the skin's moisture barrier. Get this product!
Neutrogena Ultra Sheer Dry-Touch Sunscreen SPF 100: This lightweight sunscreen offers high-level protection against sunburn and premature aging. It features Neutrogena's Dry-Touch technology, which absorbs quickly for a non-greasy, matte finish. Get this product!
Australian Gold Botanical Sunscreen SPF 50: This mineral-based sunscreen is formulated with natural botanical extracts like eucalyptus and red algae to provide antioxidant-rich protection against UV rays. It is water-resistant for up to 80 minutes and suitable for sensitive skin. Get this product!
