Healthy vitamin C levels go with better muscle strength and faster walking

Here is a good reason to peel that orange. People with healthy vitamin C levels in their blood had better muscle strength and moved more easily in everyday tests. And vitamin C is the kind of nutrient you can get from fruits and vegetables you already know.

The finding comes from more than 5,000 adults in England. Those with optimal vitamin C walked faster and got up from a chair more quickly than those with low levels. The women in the study also had a stronger handgrip.

How the study worked

Researchers looked at more than 5,000 people aged 48 to 92 from the EPIC-Norfolk group in England. They measured vitamin C in each person’s blood and also asked about what they ate. Then they tested handgrip strength, walking speed and how long it took to stand up from a chair five times. The results were published Oct. 24, 2026, in Calcified Tissue International. The study took one snapshot in time, so it shows a link between vitamin C and strength, and longer studies will show how far that link goes.

What they found

The researchers compared people with optimal vitamin C in their blood to people with low levels. They also accounted for lifestyle, health and diet, so the gap was not simply explained by those things.

Women with optimal levels:

• Had a stronger grip, measured relative to height, by 0.54 kg/m2.
• Walked faster by 0.11 meters per second.
• Finished five chair stands 1.03 seconds sooner.

Men with optimal levels:

• Walked faster by 0.05 meters per second.
• Finished five chair stands 0.71 seconds sooner.

In a test of everyday movement, a full second is a real difference. Grip strength is a handy window into overall muscle strength, and walking speed and chair stands show how well your legs work in daily life.

What people ate mattered for women too. Women who ate more vitamin C had faster walking speeds and quicker chair stands than women who ate the least. For example, women in the second-highest group for vitamin C intake stood up 0.67 seconds faster. In men, the amount of vitamin C in their food did not line up with performance, but their blood levels did.

What counts as optimal vitamin C?

The researchers sorted blood vitamin C into three groups. Low was below 25 micromoles per liter (μmol/L), a standard lab unit. Suboptimal was 25 to below 50. Optimal was 50 or above.

You can’t see your own number without a blood test, but the idea is simple. Vitamin C comes from food, and people who eat more fruits and vegetables tend to have higher levels.

What you can do today

Pick one vitamin C food and add it to tomorrow’s meals. An orange is perfect. Kiwi, strawberries, bell peppers and broccoli are other easy picks from the produce aisle. Fresh, frozen or canned-in-juice all work, so use whatever fits your budget and your week.

If you like the idea of a stronger body, pair that orange with a few chair stands. Sit down, stand up, and repeat five times. It is the same move the researchers timed.