Vitamin D: Why It Matters and How to Get Enough

Vitamin D helps the body absorb calcium for healthy bones and plays a role in muscle and immune function. The body makes it from sunlight, but many people — especially those who stay indoors or cover up — don't get enough. The fix is usually simple: sensible sun, food sources, and supplements where needed.

Why does vitamin D matter?

Vitamin D is essential for absorbing calcium and phosphate, which keep bones, teeth and muscles healthy. Low levels are linked to weaker bones (and, in children, rickets). It also supports normal immune function. Because few foods are naturally rich in it, sunlight and supplements are the main sources for many people.

How do we get vitamin D?

The skin makes vitamin D when exposed to sunlight (UVB) — which is why deficiency is common where people spend most time indoors or use full sun cover. Researchers have long studied this link; for example, a study at Creighton University, NCT00473317, examined how sunlight exposure affects blood vitamin D levels. Diet (oily fish, eggs, fortified foods) and supplements make up the difference.

We cite this study to illustrate how vitamin D status is studied. Sun exposure must be balanced against skin-cancer risk — more sun is not automatically better.

Practical takeaways

• Get a little safe sun regularly, without burning — but don't rely on sunburn risk to top up.
• Include dietary sources — oily fish (salmon, sardines), eggs and fortified foods.
• Consider a supplement if you are mostly indoors, cover up, are older, or have darker skin — these groups are more prone to low levels.
• Ask your doctor if you're unsure; a simple blood test can check your level, and very high doses can be harmful.

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Source: ClinicalTrials.gov, U.S. National Library of Medicine — study NCT00473317 (Creighton University).

This article is general wellness information, not medical advice. Please consult a healthcare professional before starting supplements or if you have concerns about your vitamin D level.