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In this “Ask Me Anything” (AMA) episode, Peter delves into two topics that have generated a lot of questions over the years: skin cancer and sunscreen. He begins by exploring the basics of UV radiation, discussing its effects on vitamin D conversion, photoaging, and its role in skin cancer. He examines various skin types, discussing their implications for sun exposure and vitamin D levels, as well as how to determine where you fall on the skin type scale. He then delves into the various types of skin cancer, with a particular emphasis on melanoma, exploring its complex relationship with UV exposure and other contributing risk factors. Additionally, he covers tanning beds, the importance of early skin cancer detection through regular skin checks, and the often confusing topic of sunscreen. He explains how sunscreen affects UV radiation and skin cancer risk, what SPF levels to choose, the differences between organic and mineral sunscreens, and what to consider when selecting the best sunscreen for your needs.

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We discuss:

• The impact of UV radiation on the skin [2:00];

• Understanding solar UV: from the electromagnetic spectrum to skin health [3:45];

• The role of sunlight in vitamin D production [8:30];

• Factors contributing to vitamin D deficiency: insufficient UV exposure, magnesium levels, and more [9:45];

• Sun exposure needs for different skin types, and the limitations of current studies in defining vitamin D deficiency [12:45]