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Serum can refer to a variety of things, including an advanced wavetable synthesizer, skin treatments, and bodily fluids such as blood serum or serous fluid. Skin serums are light, easily absorbed liquids designed to manage specific skin concerns and provide various benefits, such as hydration and brightening. Serum differs from plasma in that it is the liquid remaining after blood has clotted, while plasma is the liquid remaining when clotting is prevented. In general, serum tends to refer to the clear portion of bodily fluids in animals and plants.
SPF 50 is a level of protection offered by sunscreen that reflects both UVA and UVB rays to help prevent sunburn and skin cancer. Properly applied SPF 50 sunscreen blocks 98% of UVB rays, making it preferable for those with a history of skin cancer or fair skin. Sunscreens with SPF values between 30 and 50 offer adequate sunburn protection, even for the most sensitive skin. However, experts recommend using sunscreen with SPF 50 or higher for daily use to even out skin tone and achieve a good texture. Choosing a broad-spectrum SPF 50+ sunscreen filters 98% of UV radiation, providing slightly more protection than an SPF 30+ sunscreen. Nonetheless, it is necessary to reapply sunscreen every two hours, particularly if swimming or sweating, for maximum effectiveness.
