Should I skip sunscreen because I'm worried about vitamin D deficiency?

No, the concern is overblown. Sunscreen blocks UVB rays, but people don’t apply enough, miss spots, and sweat it off, so your body still gets enough incidental sun exposure for vitamin D unless you’re a vampire or live in a basement. Vitamin D deficiency is driven by indoor lifestyles, not sunscreen use—a few minutes of sun on arms and face a few times a week is enough, or eat fatty fish or take a supplement. Skin cancer is a real risk, and sunscreen is an easy way to reduce it, so don’t trade a small vitamin D problem for a real cancer risk.