You know the feeling. You have been tired for weeks, you keep catching every cold going around, and a small knock on the arm turns into a dark bruise that lingers. Most people chalk it up to stress, poor sleep, or just getting older.
According to the NIH Office of Dietary Supplements, about 7 in 100 people in the United States are low on vitamin C. The early warning signs look nothing like the old picture of scurvy. They look like ordinary tiredness, rough skin, and gums that bleed when you brush.
NHANES data from 2017-2018, analyzed in the American Journal of Clinical Nutrition, found about 6.8 percent of US adults were deficient in vitamin C. The rate has barely moved since 2005-2006.
The 7 warning signs that often get written off as something else
The NIH fact sheet and the clinical reference StatPearls describe a cluster of signs that can appear within one to three months of low vitamin C intake. They are easy to miss because none of them scream deficiency.
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- Persistent fatigue. Lethargy, malaise, and low energy are among the first things people notice.
- Rough and bumpy skin. The medical term is hyperkeratosis. Little bumps appear around hair follicles.
- Bleeding or swollen gums. Capillaries in the gums become fragile.
- Slow-healing wounds. Small cuts and scrapes take longer to close.
- Easy bruising. Tiny red dots (called petechiae) or larger bruises appear from minor knocks.
- Aching joints. Blood can leak under the lining of joints, causing pain and stiffness.
- Frequent infections. The immune system does not fight back as well.
The common thread is collagen. Vitamin C is needed to build collagen, the protein that holds skin, blood vessels, gums, and connective tissue together. Without enough of it, these tissues become fragile.
Who is most likely to run low
Not everyone is equally at risk. People who smoke need 35 mg more vitamin C per day than non-smokers, because the toxins in cigarette smoke speed up how fast the body uses the vitamin. Secondhand smoke counts, too.
Older adults who live alone and eat few fresh fruits or vegetables are another group. So are people with alcohol use disorder, people on very restricted diets, and anyone with a condition that limits how well the gut absorbs nutrients.
How much you need and what to put on the plate
The recommended daily intake is 90 mg for adult men and 75 mg for adult women. It is not a hard number to hit if the week includes some fresh produce.
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Food | Vitamin C |
|---|---|
Red bell pepper, raw, ½ cup | 95 mg Also read: What happens to your body in the first month of lifting weights after 50 |
Orange juice, ¾ cup | 93 mg |
Orange, 1 medium | 70 mg Also read: Scientists tracked 427 lives for 47 years and pinpointed when your fitness starts to slip |
Kiwifruit, 1 medium | 64 mg |
A single raw red bell pepper covers a full day for most adults. So does one glass of fresh orange juice with a kiwi at breakfast. Strawberries, broccoli, Brussels sprouts, and cantaloupe are also solid sources.
Vitamin C is water soluble, so the body does not store large amounts. Daily intake matters more than loading up once a week. Heat destroys it, so lightly cooked or raw produce holds on to more.
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If any of the warning signs above have been dragging on, especially bleeding gums, unexplained bruising, or wounds that keep reopening, talk to a doctor.
A simple blood test can measure vitamin C status, and most mild deficiencies respond quickly to food changes or a short course of supplementation.
This article is made and published by Jesper Bengtson, who may have used AI in the preparation.