Vitamin D: The Deficiency Hiding in Plain Sight

Vitamin D is called the "sunshine vitamin" — and that's exactly why so many people run low on it. We work indoors, wear sunscreen, and spend winters in short-day states, and our bodies simply don't make what they need. It's one of the most common nutritional shortfalls in the country: roughly a third of U.S. adults are deficient, and even more fall into the "insufficient" range. Here's why it matters and how to close the gap.

What vitamin D does

Vitamin D is more like a hormone than a typical vitamin. It helps your body absorb calcium for strong bones, supports normal immune function, and is tied to mood and energy. Because it touches so many systems, running low tends to show up as vague, easy-to-dismiss symptoms rather than one obvious sign — which is a big part of why it hides in plain sight.

Why so many people are low

Your skin makes vitamin D from direct sunlight, but modern life gets in the way: indoor jobs, sunscreen (important for skin health), darker skin tones that need more sun exposure, older age, and northern winters where the sun is too weak for months. According to the Cleveland Clinic, about 35% of U.S. adults are vitamin D deficient — and few foods contain much of it naturally, so diet alone rarely fills the gap.

Signs worth paying attention to

• Frequent fatigue or low energy.

• Low mood, especially in darker winter months.

• Getting sick often, or slow to bounce back.

• Aches in bones or muscles.

These overlap with many things — but if several fit and you get little sun, vitamin D is worth checking.

How to get enough

A few sensible moves cover most people: get some sensible sun exposure when you can, eat the foods that do contain it (fatty fish like salmon, egg yolks, and fortified foods), and consider a supplement — especially in winter or if you're rarely outside. Vitamin D is one of the nutrients where a simple, quality supplement genuinely helps, because food and lifestyle often can't close the gap on their own. A blood test can tell you exactly where you stand.

Frequently asked questions

How common is vitamin D deficiency? Very — roughly a third of U.S. adults are deficient, and many more are in the "insufficient" range, with higher rates in winter and among people who get little sun.

Can I get enough vitamin D from food? It's hard — few foods are naturally rich in it. Fatty fish, egg yolks, and fortified foods help, but many people still fall short.

Should I take a vitamin D supplement? Many people benefit, especially in winter or with limited sun. A blood test helps you and your provider choose the right amount.

Does sunscreen cause deficiency? Sunscreen reduces vitamin D production, but skin protection still matters — diet and supplements are the safer way to close the gap.

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These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any new supplement, especially if you are pregnant, nursing, or taking medication.