Vitamin C Deficiency: Symptoms, Risks, and How to Treat It

Scurvy — the vitamin C deficiency disease once synonymous with 18th-century sailors — is quietly reappearing in modern clinics. Three peer-reviewed case reports published in 2026 document patients, including children, being diagnosed with advanced scurvy after years of severely restricted diets. A report by Ramirez and colleagues in Medicina (Buenos Aires) documented multiple pediatric scurvy cases at a single hospital in Argentina, every patient linked to severe food selectivity. Meanwhile, a 2026 case in Cureus described a child whose scurvy symptoms were so severe they initially mimicked cancer. These are not historical anomalies — they are reminders that vitamin C deficiency remains a real clinical risk for anyone whose diet is severely limited.

What Vitamin C Actually Does in Your Body

Vitamin C (ascorbic acid) is a water-soluble vitamin that the human body cannot synthesize on its own — we must obtain it entirely from food or supplements. It plays several non-negotiable roles in physiology:

• Collagen synthesis: Vitamin C is a required cofactor for hydroxylation of proline and lysine residues in collagen. Without adequate vitamin C, collagen cannot be properly formed or maintained. This is why connective tissue — gums, skin, blood vessel walls, tendons — begins to break down in deficiency.
• Antioxidant activity: As a potent antioxidant, vitamin C neutralizes free radicals and regenerates other antioxidants, including vitamin E.
• Immune support: Vitamin C accumulates in white blood cells and supports both innate and adaptive immune responses.
• Iron absorption: It converts dietary non-heme iron (from plant sources) to a more bioavailable form, significantly enhancing absorption.
• Neurotransmitter synthesis: Vitamin C is a cofactor in the synthesis of dopamine, norepinephrine, and carnitine.

Image: File:Scorbutic gums.jpg — Centers for Disease Control and Prevention (Public domain), via Wikimedia Commons

Early Warning Signs of Vitamin C Deficiency

Symptoms typically begin appearing after 4–12 weeks of very low vitamin C intake (below 10 mg per day). They develop in a predictable progression:

Mild deficiency (weeks 4–8):

• Persistent fatigue and general malaise
• Irritability and low mood
• Mild joint or limb pain, especially in the legs
• Slow wound healing
• Dry, rough, or scaly skin

Moderate deficiency (weeks 8–12):

• Gum inflammation and bleeding, especially when brushing teeth
• Perifollicular hemorrhages — tiny red or purple spots around hair follicles
• Corkscrew hair — a distinctive sign where hair grows in an abnormally curled pattern due to defective keratin formation
• Easy bruising from minor contact
• Swollen, tender joints

Severe deficiency / frank scurvy (beyond 3 months):

• Pronounced gum swelling, spongy texture, and potential tooth loss
• Hemarthrosis (bleeding into joint spaces), as documented by Greenblatt and colleagues in their 2026 case report in the Journal of Brown Hospital Medicine
• Large spontaneous bruising (ecchymoses)
• Wound dehiscence — previously healed wounds reopening
• Severe anemia

Why Scurvy Is Being Diagnosed Again in 2026

It might seem implausible that people in high-income countries are developing scurvy. Yet the evidence from 2026 peer-reviewed literature is clear. Three distinct at-risk groups are appearing in clinical settings:

1. Children and adults with severe food selectivity. A 2026 case series published in Medicina (Buenos Aires) by Ramirez, Moreno, and colleagues documented multiple scurvy cases at a pediatric hospital — every patient had severe food selectivity, with diets entirely lacking fresh fruits and vegetables. A 2026 Cureus case report by Babour and colleagues described a child whose scurvy was initially suspected to be malignancy due to bone pain and bruising. Only a careful dietary history and plasma ascorbic acid measurement confirmed scurvy.

2. Adults with alcohol use disorder. Chronic heavy alcohol consumption interferes with absorption, storage, and utilization of vitamin C. Clinicians routinely screen for vitamin C deficiency in this population.

3. Elderly individuals with limited food access or appetite. Social isolation, dental problems, low income, and reduced appetite compound to create dietary inadequacy in some older adults.

How Much Vitamin C Do You Actually Need?

The Recommended Dietary Allowance (RDA) set by the U.S. National Institutes of Health is:

• Adult men: 90 mg/day
• Adult women: 75 mg/day
• Pregnant women: 85 mg/day
• Breastfeeding women: 120 mg/day
• Smokers: Add 35 mg/day — smoking increases oxidative stress and vitamin C turnover
• Children (ages 1–8): 15–25 mg/day
• Teens (14–18): 65–75 mg/day

The tolerable upper intake level for adults is 2,000 mg/day. Above this, gastrointestinal side effects become likely, and kidney stone risk may increase in susceptible individuals.

Best Food Sources of Vitamin C

Getting adequate vitamin C from food is achievable for most people without supplementation. Here are high-yield sources based on USDA nutrient data:

• Red bell pepper, raw (½ cup): ~95 mg
• Orange juice (¾ cup): ~62–93 mg
• Kiwi (1 medium): ~64 mg
• Green bell pepper, raw (½ cup): ~60 mg
• Broccoli, cooked (½ cup): ~51 mg
• Strawberries (½ cup): ~49 mg
• Brussels sprouts, cooked (½ cup): ~48 mg
• Tomato juice (¾ cup): ~33 mg

One medium orange provides roughly 70 mg of vitamin C — close to the adult daily requirement. Importantly, cooking reduces vitamin C content significantly because ascorbic acid is both heat-sensitive and water-soluble. Raw or lightly steamed produce is preferable when vitamin C intake is a concern.

Treatment: How Quickly Does Deficiency Resolve?

Treatment of confirmed deficiency is both straightforward and fast-acting. Standard treatment for documented scurvy involves supplemental vitamin C, typically 300–1,000 mg per day in divided doses until tissue stores are replenished, followed by maintenance at RDA levels. Response is typically rapid:

• Fatigue and irritability: Improve within 24–48 hours of supplementation
• Gum tenderness: Begins to improve within 1 week
• Perifollicular hemorrhages and skin changes: Resolve over 2–4 weeks
• Musculoskeletal pain: Typically resolves within 2–4 weeks
• Hemarthrosis and larger hemorrhages: May take longer and require follow-up imaging

The patients described in all three 2026 case reports recovered once appropriate vitamin C supplementation was initiated and dietary counseling was provided.

Frequently Asked Questions

Can you develop vitamin C deficiency even if you take a multivitamin?

Most standard multivitamins contain 60–100% of the RDA for vitamin C, which is sufficient to prevent deficiency for most people. However, some formulas — particularly gummy formats targeted at children — may deliver less reliable doses. If the multivitamin is not taken consistently, or if intake is insufficient due to high physiological demands (smokers, dialysis patients, pregnancy), deficiency can develop even in regular multivitamin users. Check the label to confirm your product provides at least 75–90 mg of vitamin C.

Is vitamin C deficiency the same as scurvy?

Not exactly. "Vitamin C deficiency" is a spectrum. Marginal deficiency (plasma levels below 23 µmol/L) can cause fatigue, increased susceptibility to infection, and impaired wound healing without the full clinical picture of scurvy. "Scurvy" refers to the more advanced clinical syndrome — with gum disease, perifollicular hemorrhage, hemarthrosis, and wound breakdown — seen when plasma levels approach zero and tissue stores are exhausted. All scurvy involves severe deficiency, but not all vitamin C deficiency constitutes scurvy.

Does taking extra vitamin C prevent colds?

This is one of the most studied questions in nutritional science. Current evidence from large meta-analyses does not support routine vitamin C supplementation for cold prevention in the general population. However, in people under extreme physical stress — marathon runners, soldiers in subarctic conditions — regular supplementation may modestly reduce cold incidence. If you already obtain adequate vitamin C from diet, additional supplementation is unlikely to provide meaningful additional protection.

The bottom line: Vitamin C deficiency is preventable and treatable, but it requires more dietary vigilance than most people assume. The 2026 case reports from pediatric and adult medicine make a compelling case that food selectivity and restrictive eating are genuine risk factors for nutritional deficiency — not just in low-income settings, but in modern clinical practices worldwide. One red bell pepper, one orange, or a cup of strawberries per day is sufficient to prevent deficiency in most adults. For those who suspect they have symptoms, a plasma ascorbic acid level and dietary assessment are the right first steps — before self-treating with high-dose supplements.

Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making health decisions.