The Importance of Vitamin D for Immunity and Bones

Vitamin D is often called the “sunshine vitamin” because our bodies make it when exposed to sunlight. Yet many people don’t get enough, especially during winter or if they spend most time indoors.

This vitamin is crucial for bone health because it helps the body absorb calcium. Without enough vitamin D, bones can become weak and brittle, increasing the risk of fractures and osteoporosis.

Vitamin D also strengthens the immune system. Low levels have been linked to increased risk of infections, fatigue, and even depression. Some studies suggest it may reduce the severity of illnesses like the flu.

Good sources include fatty fish, fortified dairy products, and supplements if needed. Just 10–15 minutes of sun exposure a few times a week can also boost levels, though this varies by skin tone, age, and location.

Since deficiency is common, many doctors recommend testing vitamin D levels and supplementing if needed. Supporting bones and immunity makes it one of the most important nutrients for healthy aging.