National Sunscreen Day Is May 27. As the importance of sun protection becomes more widely recognized, knowing how much sunscreen to use is crucial to effectively guard your skin against harmful UV rays.
Whether you’re heading to the beach or just running errands, applying the right amount of sunscreen is essential for preventing sunburn, premature aging, and skin cancer. Sunscreen protects your skin from ultraviolet (UV) radiation, which includes UVA and UVB rays. UVA rays can prematurely age your skin, causing wrinkles and age spots, while UVB rays can burn your skin. Both types contribute to the risk of skin cancer. 
Using sunscreen correctly can significantly reduce these risks. To ensure optimal protection, it’s important to use enough sunscreen. Use approximately one teaspoon (about 5 milliliters) of sunscreen for your face and neck. Don’t forget areas like the ears and the back of your neck. For the entire body, you should use about one ounce (30 milliliters) of sunscreen, which is roughly the amount in a shot glass. This includes arms, legs, back, chest, and other exposed areas. Also, be generous with your application. Most people apply less sunscreen than needed, which can significantly reduce its effectiveness. 
Remember, it’s better to apply too much than too little. Pay attention to commonly missed areas such as the tops of the feet, the back of the knees, and the ears. If you have short or thinning hair, apply sunscreen to your scalp or wear a hat. Sunscreen should be reapplied every two hours, or more frequently if you’re swimming or sweating. Water-resistant sunscreens still need to be reapplied after swimming or sweating. Apply sunscreen 15-30 minutes before going outside. This gives it time to bind to your skin and provide optimal protection. Sunscreen can lose its effectiveness over time. 
Always check the expiration date on the bottle and replace it if it’s expired. Choose a broad-spectrum sunscreen, which protects against both UVA and UVB rays. Use a sunscreen with an SPF of at least 30. Higher SPF provides more protection, but no sunscreen can block 100% of UV rays. If you’re swimming or sweating, opt for a water-resistant sunscreen. These are designed to stay on your skin longer when in contact with water. And whenever possible, stay in the shade, especially during peak sun hours from 10 a.m. to 4 p.m. Clothing can provide an additional layer of protection. Wear long sleeves, pants, a wide-brimmed hat, and UV-blocking sunglasses. Tanning beds emit UV radiation that can increase the risk of skin cancer and accelerate skin aging. Proper sunscreen use is a key part of protecting your skin from the sun’s harmful rays. 
By applying the right amount of sunscreen and reapplying it regularly, you can significantly reduce your risk of sunburn, premature aging, and skin cancer. Combine sunscreen with other protective measures like seeking shade and wearing protective clothing to ensure comprehensive sun protection. Remember, consistent and correct use of sunscreen can keep your skin healthy and beautiful for years to come.
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