Sunscreens are FDA-approved over-the-counter products that protect against UVA and UVB rays that cause sunburn, premature skin aging, and skin cancer. They reduce the risk of skin damage when used as directed with other sun protection measures, including limiting time in the sun and wearing protective clothing.서면피부과
Sunscreen ingredients fall into two categories: physical blockers and chemical absorbers. The former use minerals such as zinc oxide and titanium dioxide to reflect or scatter UV rays.
Protects against UV rays
Sunlight contains invisible UV rays that can cause sunburn and damage skin cells, leading to skin cancer. Sunscreens work by filtering these rays and blocking them from reaching the outer layer of skin. They come in two forms: chemical and physical. Chemical sunscreens contain ingredients that absorb the sun’s UV rays. Examples include titanium diox 서면피부과 ide and zinc oxide. Physical sunscreens, on the other hand, reflect and scatter UV rays. The most common ones are oxybenzone and butyl methacrylate.
Sunscreens protect against both types of UV radiation, but the amount of protection depends on a number of factors. For example, your skin tone plays a role in how sensitive you are to UV rays and how easily you burn. Certain medications and diseases also increase your sun sensitivity, increasing the level of protection required.
In addition to UV filters, sunscreens contain thickening agents, emulsifiers, chelating agents, pH-balancing agents and antioxidants. These help to keep the active ingredients in solution and stable, while also extending the shelf life of the product.
Another important feature of sunscreens is their ability to stay on the skin when you sweat or swim. This helps to ensure that you’re protected from the sun for as long as possible, even after spending a full day outdoors. However, it’s crucial to reapply sunscreen throughout the day as needed.
Prevents sun 서면피부과 burn
Sunscreen prevents UV rays from damaging the skin and causing sunburn. It also protects against the development of skin cancer and slows the aging process. People of all skin colors should wear sunscreen when they go outside. The best way to avoid sunburn is to use a broad-spectrum SPF 50+ sunscreen, and to cover the skin with clothing and hats.
Sunscreen contains either physical particles or complex chemical ingredients that help filter UV radiation. Physical particles (like zinc oxide and titanium dioxide) reflect or scatter UV radiation, while chemical absorbers (such as oxybenzones and benzophenones) convert the UV rays to heat energy by absorbing them.
Although many sunscreens contain ingredients that may be absorbed into the skin, they do not have any toxicity or harmful effects on health. However, some individuals can develop a photocontact dermatitis to certain ingredients, especially the benzophenones.
It is important to remember that UV damage can occur at any time of year, so people of all skin types should use sunscreen throughout the year. It is important to minimize sun exposure between 10 am and 4 pm, when the sun’s rays are strongest, and to use protective clothing and wide-brimmed hats. In addition, people should take vitamin D supplements to keep their skin healthy. Moreover, it is advisable to avoid tanning beds and other artificial sources of UV light.
Prevents skin cancer
Sunscreen reduces skin cancer risk and prevents early signs of aging, such as wrinkles, by blocking UVA and UVB rays. However, sunscreen should be used as one component of a comprehensive sun-protection strategy. Other important strategies include seeking shade, covering the skin with clothing and brimmed hats, and wearing sunglasses that block UVA and UVB rays. Sunscreen should be reapplied frequently, and especially after sweating, swimming or toweling off. The best sunscreen is an SPF 30 or higher.
Most sunscreens contain a combination of chemical and physical sun filters. Chemical filters, such as avobenzone, homosalate, and oxybenzone, work by absorbing the sun’s UVA and UVB rays. They do this by absorbing the photons and converting them to heat energy. These chemicals then dispense the energy into longer, lower-energy wavelengths of light that do not damage skin cells. Physical blocks, such as zinc oxide and titanium dioxide, reflect or scatter the UV rays away from the skin.
Numerous epidemiological studies have shown that people who use sunscreen regularly are at reduced risk of melanoma and non-melanoma skin cancers (basal and squamous cell carcinoma) than those who do not. Two recent 2020 studies, including the Nambour Skin Cancer Prevention Trial, found that participants who applied sunscreen daily and wore hats cut their melanoma risk by 50%, compared with those who did not.
Prevents premature aging
Sunscreens not only protect against sunburn and skin cancer, but they also prevent premature aging of the skin. They do this by blocking UVA and UVB rays that can cause uneven pigmentation and changes in skin texture. To avoid premature aging, choose a sunscreen with a high SPF and a broad spectrum of protection. You should also reapply it often and after sweating.
The SPF of a sunscreen is determined by its ability to absorb the UVB and UVA rays that can cause sunburns, freckles, age spots, and wrinkles. It is recommended that you use a sunscreen with an SPF of 30 or higher, and reapply it every two hours. A broad-spectrum sunscreen is the best option, as it protects against both UVA and UVB rays.
Another benefit of sunscreen is that it prevents oxidative stress, which can lead to wrinkling and uneven pigmentation. This is due to the formation of reactive oxygen species, which are a byproduct of UV exposure. A sunscreen with antioxidants like vitamins C and E, resveratrol, or green tea extract can help prevent premature aging of the skin.
Some chemical sunscreen ingredients, such as oxybenzone and octinoxate, have been shown to harm coral reefs. These chemicals have also been shown to be absorbed into the bloodstream. Benzene, a chemical found in some sunscreens, can reduce the body’s immune system and increase your chances of developing cancer.