Vitamin D (25OH) Blood Test

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Do you often feel tired, rundown, or struggle with muscle aches and pains? You may be at risk of vitamin D deficiency, especially if you spend little time outdoors, have darker skin, or are over 65 — all factors that can affect your ability to produce vitamin D. Our vitamin D test helps determine if your levels are low, which could be contributing to symptoms like fatigue and frequent illnesses.

Take control of your health with our best-selling checks. Whether you’re tackling symptoms, addressing health concerns, or simply being proactive, this test helps you gain insights and reduce your risk of common conditions.

Discover the power of small lifestyle changes to feel like yourself again.

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Vitamins

Vitamin D

Despite its name, vitamin D is actually a hormone that’s produced by your skin when it’s exposed to sunshine. Before your body can use vitamin D produced by sun exposure (known as vitamin D3), it must be converted into another form called 25 hydroxycholecalciferol (25 OH). Vitamin D (25 OH) is the major circulating form of vitamin D, and so your vitamin D (25 OH) level is considered the most accurate indicator of vitamin D supply to your body.

Vitamin D is essential for healthy bones and teeth, as it helps your body absorb calcium. It also plays a role in muscle health, immune function, and mental health.

Low vitamin D symptoms include muscle weakness, mood swings, and fatigue. Many people in the UK have low vitamin D levels, and people with dark skin and people who don’t spend much time outdoors are particularly at risk.

Small amounts of vitamin D can be obtained from food, especially oily fish, eggs, and vitamin-D fortified foods. But if you have a vitamin D deficiency, you’re unlikely to be able to improve your levels by food alone.