SPF is a measure of how much solar energy (UV radiation) is required to produce sunburn on protected skin (i.e., in the presence of sunscreen) relative to the amount of solar energy required to...

2023年10月10日 · SPF refers to the amount of UV radiation it takes to produce sunburn when wearing sunscreen in comparison to how much UV exposure it takes for unprotected skin to get sunburned. But, contrary to popular belief, SPF does not tell you how long you can stay in the sun without getting burned.

2023年4月6日 · Which SPF do I need? SPF stands for “sun protection factor”—but specifically, says Megan Rogge, MD, a board-certified dermatologist and assistant professor of dermatology at UTHealth Houston, SPF is a marker of protection against the sun’s UVB rays.

2024年3月14日 · SPF 30 is the level most recommended by dermatologists for daily use by adults and kids. It’s the default choice. “SPF 30 is the magic number,” says Margarita Lolis, M.D., a …

2020年1月10日 · Sun protection factor (SPF) indicates how long sunscreen will protect your skin from sunburn. So, in theory, if your skin would usually burn after 10 minutes, using a sufficient …

2023年5月26日 · SPF (sun protection factor) is the scale based on the time it takes for "untanned skin to become red when exposed to UV light," says Glodny. For example, he says that a sunscreen with an SPF of 50 will "allow your skin to be exposed to the sun 50 times longer before it turned red compared to your skin without sunscreen."

2021年6月17日 · Dermatologists and skin scientists explain how sunscreen works to protect skin, what SPF means, how chemical and mineral sunscreens work, and the difference in SPF levels.

SPF stands for Sun Protection Factor, a measure of how well a sunscreen protects the skin from ultraviolet (UV) radiation. It is actually the amount of protection a sunscreen provides against UVB rays, which are the type of rays most responsible for causing sunburn and contributing to long-term damage to the skin, including increased risk of ...

SPF stands for Sun Protection Factor. It measures how well a sunscreen protects your skin from UVB rays, the type of ultraviolet radiation that causes sunburn. Here’s a simple way to understand it: • SPF 30 allows approximately 1/30th of UVB rays to reach your skin. • SPF 50 reduces that to 1/50th, offering more protection.

In this article, we'll explain what SPF is, how it works, and why it's so important to choose the right sunscreen for your needs. What is SPF? SPF stands for "Sun Protection Factor" and is a measure of how much protection a sunscreen product provides against UVB rays.