UV light is shown to be one of the greatest contributors to premature aging and skin cancer. To safeguard your skin, it's essential to know the different types of UV light and the protective strategies available to you. In this article, we will explore the effects of UVA, UVB, and UVC light on the skin and delve into effective protection methods.
01
Different Types of Ultraviolet Light and Their Effects on Skin
Ultraviolet (UV) light is a form of non-visible light emitted by the sun. UV rays can be classified into three main types, UVA, UVB, and UVC, based on their wavelengths: UVA, UVB, and UVC rays each have different effects on skin due to their different penetration capabilities and levels of energy. While UVA rays can contribute to premature skin aging and skin cancer, UVB rays are the primary cause of sunburn and can directly cause DNA damage. Protecting your skin from both UVA and UVB exposure is vital for maintaining skin health and minimizing the risk of sun-related skin conditions. While youโre less likely to encounter UVC in your daily life, it's still equally important to remain cautious of any potential sources.
UVA Light
Ultraviolet A (UVA) makes up the majority of the UV radiation that reaches the Earth's surface. UVA rays have a longer wavelength compared to UVB and UVC rays and are thus the least energetic. While they carry less energy than UVB and UVC rays, UVA rays can penetrate the skin more deeply into the dermis (skinโs middle layer) due to their long wavelength. UVA light can lead to various harmful effects on the skin, including:
- Premature Aging: UVA rays are a significant contributor to premature skin aging as they lead to collagen degradation and increased senescence, causing wrinkles, fine lines, and a loss of skin elasticity.1
- Breakdown of Collagen & Elastin: UVA rays increase the level of Reactive Oxygen Species (ROSs) in the skin, which can damage the skin's collagen and elastin fibers in the dermis. Collagen and Elastin are crucial for maintaining the structure of the skin, therefore their depletion can lead to sagging and dull complexion .1
- Skin Cancer: Although UVA rays are less likely to cause direct DNA damage, they can contribute to the development of skin cancer over time.1
UVB Light
Ultraviolet B (UVB) rays have a shorter wavelength and higher energy compared to UVA rays. Despite being partially absorbed by the Earth's ozone layer, a significant amount of UVB rays reach the Earth's surface; and due to their higher energy, they have more immediate and direct effects on the skin. These can include:
- Sunburn: UVB rays are the primary cause of sunburn โ damaging the outermost layer of the skin (the epidermis), and leading to redness, pain, and peeling known as sunburn.4
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DNA Damage: UVB radiation can cause direct damage to the DNA in skin cells, increasing the risk of skin cancer.3
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Skin Pigmentation: UVB exposure can lead to an increase in skin pigmentation by triggering melanin production, causing freckles and dark spots .5
UVC Light
Ultraviolet C (UVC) has the shortest wavelength and the most energy among UV rays. Fortunately, most UVC rays are absorbed by the Earth's atmosphere and as a result, do not reach the surface. Because of this, their direct effects on the skin are minimal. However, exposure to artificial sources of UVC, such as certain types of lamps and equipment used in medical and industrial settings, can be harmful and may cause skin damage. Additionally, the Earthโs eroding atmosphere may eventually require us to protect ourselves from this type of UV exposure in the future.
02
How to Protect Skin from UV Light
Protecting your skin from the harmful effects of UV light is essential for maintaining skin health, and preventing premature skin aging and long-term damage. Understanding what the sun does to your skin allows you to take appropriate measures to safeguard your skin's well-being. Some effective strategies are:
- Sunscreen: Use a broad-spectrum sunscreen with a minimum SPF of 30 to protect against both UVA and UVB rays. Apply it generously to all exposed skin, including your face, neck, arms, and legs. You should then reapply every two hours when outdoors.
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Protective Clothing: Wear long-sleeved shirts, wide-brimmed hats, and sunglasses, and use UV ray-protective umbrellas to shield your skin and eyes from ultraviolet radiation.
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Seek Shade:ย When the sun is at its strongest, usually between 10 a.m. and 4 p.m., seek shade whenever and wherever possible.
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Avoid Tanning Beds:ย Tanning beds emit concentrated UV radiation and should be avoided.
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Regular Skin Checks: Perform regular skin self-examinations to check for any changes, moles, or unusual growths. You should also consult a dermatologist if you have any concerns.
03
How to Find Sunscreen that Protects from UVA and UVB Rays
To effectively shield your skin from both UVA and UVB rays, it's important to choose a sunscreen that provides broad-spectrum protection. Here are some key factors to look for when selecting a sunscreen:
- Broad Spectrum - A sunscreen labeled as "broad spectrum" is formulated to protect against both UVA and UVB rays. This label informs you that, at the very least, it provides protection against UVA and UVB rays.
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SPF Rating - The Sun Protection Factor (SPF) rating primarily indicates a sunscreen's effectiveness against UVB or โburningโ rays โ the higher the SPF, the greater the protection against UVB. However, it's essential to remember that SPF is only a measurement of how protective the sunscreen is against UVB, not UVA or UVC. For optimal UVB protection, look for broad-spectrum sunscreens with an SPF of at least 30 & reapply when necessary.
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PA+ and PPD System - Some countries, particularly in Asia, use the PA+ system, which also indicates the level of protection against UVA rays. The more plus signs (+), the higher the UVA protection. Furthermore in Europe, the Persistent Pigment Darkening (PPD) system also measures UVA protection, with higher numbers indicating stronger UVA defense. By choosing sunscreens with high SPF and PA+ ratings or PPD values, you ensure adequate coverage for both UVA and UVB rays.
04
How OneSkin Can Help Protect Your Skin from UV Damage
OneSkin's OS-01 SHIELD can be a valuable addition to your sun protection regimen as it offers 100% mineral broad-spectrum protection with SPF 30 PA+++. OS-01 SHIELD includes zinc oxide, our preferred mineral filter for UV protection, which provides superior protection against both UVA and UVB rays compared to titanium dioxide due to its better capacity for UV ray absorption. In OS-01 SHIELDโs formulation, you will find antioxidants that help combat free radicals generated by UV exposure, reducing oxidative stress on your skin. The OS-01 peptide has also been shown to prevent UVB-induced senescence and collagen degradation through lab studies on human skin cells [7]. By incorporating OS-01 SHIELD (available in untinted and sheer tinted versions) into your daily skin care routine, you can enjoy comprehensive protection against UV damage and promote healthier, more resilient skin.In conclusion, understanding the different types of UV light and their effects on the skin is crucial for protecting your skin from sun damage. Implementing sun protection strategies, such as wearing sunscreen, protective clothing, and seeking shade, is essential. OneSkin's OS-01 SHIELD, with its 100% mineral broad-spectrum protection, zinc oxide, antioxidants, and the OS-01 peptide, can further enhance your skin's defense against UV damage. By taking these precautions, using effective sun protection, and incorporating topical skin care products such as a peptide face moisturizer and peptide body cream into your skin care routine, you can maintain healthy and radiant skin while minimizing the risk of sun-related skin issues.
Key Takeaways:
- UV radiation is categorized into 3 different types, UVA, UVB and UVC, each with their own unique effects on skin.
- UVA are the rays most commonly attributed to causing premature aging.
- UVB is the main reason for sunburn, skin cancer and hyperpigmentation.
- UVC is generally not a concern as it does not reach the Earthโs surface. Despite that, it can still be encountered in medical or industrial settings.
- The best methods for sun protection are those that factor in shade or covering of the skin.
- Zinc oxide-based sunscreen has several benefits when compared to titanium oxide-based sunscreens such as a greater protection against UVA and UVB rays.
References
- Zonari, A., et al. Senotherapeutic peptide treatment reduces biological age and senescence burden in human skin models. Npj Aging, 9(1), 1-15. 2023.
