1 New breakthrough in sun protection According to experts at the American Academy of Dermatology, the latest innovations in sunscreen formulation research will bring significant breakthroughs in sun protection and greatly reduce the risks and hazards associated with sun exposure.
Henry Lim, chairman of the dermatology department at Henry Ford Hospital in Detroit, USA, said that they have achieved some major breakthroughs in the field of UV protection, with UVA protection being the most prominent. Henry Lim made this note during a speech at the American Academy of Dermatology Summer Science Symposium. He pointed out that the study was originally initiated to prevent UVB rays that cause sunburn. Now the study has further explored how to prevent and repair damage caused by UVA light.
As we all know, the sun's damage to the skin mainly comes from ultraviolet rays. Different wavelengths of ultraviolet rays cause different degrees of damage to the skin. The shorter the wavelength, the more serious the damage is caused. According to this, people divide UV into UVC, UVB and UVA. That is, short-wave ultraviolet (UVC) having a wavelength of 100 to 290 nm, medium-wave ultraviolet (UVB) having a wavelength of 290 to 320 nm, and long-wave ultraviolet (UVA) having a wavelength of 320 to 400 nm. The ultraviolet spectrum in sunlight is in the wavelength range of 100 to 400 nm, and can be divided into three bands. The ultraviolet rays of different wavelengths have different depths of penetration through the skin. Most of the UVC is reflected and absorbed by the stratum corneum, and only a small part penetrates into the superficial layer of the epidermis. However, since UVC passes through the atmosphere, it is mostly absorbed by the ozone layer and cannot reach the surface of the earth, so it does not pose a hazard to human skin. UVB is also mostly absorbed by the epidermis, and a small part reaches the superficial layer of the dermis, which is the main band of skin damage. Excessive exposure, UVB will damage the connective tissue of the epidermis, causing the skin to undergo a speckle reaction, resulting in thickening and aging of the epidermis, and even the formation of skin cancer. It is carcinogenic but can be blocked by thick clouds, clothing and glass. A small part of UVA is absorbed by the epidermis, most of which can penetrate into the dermis and reach the middle of the dermis, which is less harmful to the skin than UVB. However, at noon in the summer, the amount of the surface reaching the earth is 100 times more than that of UVB. It can pass through the epidermis to the dermis and cause dermal damage, so it is the main ultraviolet pathogenic spectrum. Studies have shown that UVA acts on human skin for a long time, which can cause irreparable damage such as decreased skin elasticity, increased wrinkles and accelerated aging. UVA may also increase skin contact with UVB, thereby increasing the prevalence of skin cancer. In general, ultraviolet light is very harmful to the skin and human health, such as it can increase the synthesis of melanin, leading to pigmentation, such as dark spots, freckles, chloasma and other color spots forming or increasing, increasing, Deepening, keratinocyte proliferation, destruction of dermal collagen fibers and elastic fibers. It can also cause skin hypertrophy, sagging, roughness and wrinkles, telangiectasia, and erythema. At the same time, the skin's immune function is reduced, forming skin cancer or precancerous lesions, such as keratosis, squamous cell carcinoma, melanoma and the like. Therefore, ultraviolet light can not only destroy people's face, but also pose a threat to skin health.
The results of scientific research over the past two years have shown that in the long run, UVA light is more harmful than UVB light because the former penetrates deeper into the dermis layer of the skin. Scientific research also shows that UVA light greatly accelerates the process of skin aging and is more likely to cause diseases such as skin cancer. These findings have made UVA the most headache and concern for sunscreen developers. They are constantly trying to improve the performance of sunscreen products and maximize their protection against both UV rays.
In the speech, Lim explained that due to the mastery of new technologies, manufacturers have developed unique formulations to form a hybrid and relatively stable shielding effect on two UVs (UVA and UVB rays), but no matter which formulation There are many challenges. He said, "The existing sunscreen containing Parsol 1789 or avobenzone ingredients can better prevent UVB, but after a few hours of exposure in the sun, the protective properties of these products against UVA light begin to decrease. The latest formula developed. Containing avobenzone and oxybenzone, it is much more stable and durable than previous products, and it also has a lot of protection against UVA light." So what are the latest revolutions in sunscreen?
Lim said recently researchers are exploring how natural antioxidants such as vitamin E, beta carotene and vitamin C can help protect the skin. In addition, the antioxidant properties of ingredients such as green tea and fish oil are also being further developed. The biggest benefit of these types of sunscreens is that they can be taken orally and provide full-body skin protection so that we don't have to apply sunscreen every day when we go out and don't need to apply sunscreen all day long. Recently, various oral sunscreen products have appeared on the market, which are widely welcomed by consumers. As the first oral sunscreen, Heliocare's initial sales target is a supplement containing polypodium leucotomos from the South American plant extract, which is said to provide comprehensive protection against UVA, UVB light and other image light.
In fact, there have been many reports about oral sunscreens. We all know that internal and external repairs can usually achieve twice the result with half the effort, and sun protection is no exception. The director of the dermatology department of the Duke University Medical Research Center, who enjoys the title of "Father of Vitamin C" in the field of medical beauty in the world, has proposed a new concept of prevention and protection of sun protection: using internal medicine L-Vitamin C and external sunscreen products together, Take a firm sunscreen. Australian researchers have also announced the development of a pigment tablet that protects the skin from sunburn by stimulating skin pigmentation. The new product has passed human trials and will be available soon. According to dermatologists, melanin is a natural sunscreen that protects the skin from sun rays. The new pigment tablets stimulate the formation and deposition of melanin in the skin, just like an "in-house sunscreen." In another report, US researchers also found that oral extracts from tropical ferns growing in Central America can protect the skin from UV radiation. The fern has anti-oxidant and anti-cancer effects, and researchers believe that oral administration of this antioxidant can reduce DNA damage. I believe that in the near future, these products, which are referred to as "in-service sunscreen", will bring innovation to the sunscreen market.
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