Preventing scurvy comes down to one thing: getting enough vitamin C every day. Adults need 75 to 90 mg daily, an amount easily covered by a single serving of many common fruits and vegetables. Scurvy develops after weeks to months of consistently low intake, so even small, regular amounts of vitamin C keep you protected.
How Much Vitamin C You Actually Need
The recommended daily amount varies by age and sex. Children ages 1 to 3 need just 15 mg per day, while kids ages 4 to 8 need 25 mg. Teenagers require 65 to 75 mg depending on sex. Adult men need 90 mg and adult women need 75 mg. During pregnancy, that rises to 85 mg, and during breastfeeding, to 120 mg.
Smokers need an extra 35 mg per day on top of those numbers. Smoking increases oxidative stress and speeds up the rate your body burns through its vitamin C stores, so a male smoker needs about 125 mg daily to maintain the same levels as a nonsmoker.
These targets are well above the bare minimum needed to prevent scurvy. The amount required to stave off actual deficiency symptoms is lower, around 10 mg per day, but the recommended intakes are set to keep your body’s stores comfortably full and support broader health.
Best Food Sources
Fruits and vegetables are the only reliable natural sources of vitamin C. A single medium orange provides roughly 70 mg, nearly a full day’s requirement for most adults. Bell peppers, especially red ones, pack even more per serving. Kiwi, strawberries, broccoli, and tomatoes are all strong sources. Even a baked potato contributes a meaningful amount.
You don’t need exotic superfoods or expensive produce. A varied diet that includes a couple of servings of fruits or vegetables each day will keep you well above the threshold for deficiency. The key is consistency: your body can’t manufacture vitamin C on its own and can’t store large amounts for long, so you need a steady supply.
Cooking Methods That Preserve Vitamin C
Vitamin C is sensitive to heat and dissolves easily in water, which means how you prepare food matters. Boiling potatoes, for example, can reduce their vitamin C content by 10% in just 10 minutes, and longer cooking times or smaller pieces make losses worse because the vitamin leaches into the water and then breaks down.
Baking and microwaving retain more than half of the original vitamin C because the nutrient stays inside the food rather than dissolving into cooking water. Steaming is another good option for the same reason. Eating fruits and vegetables raw, when practical, preserves the most. If you do boil vegetables, using the cooking liquid in soups or sauces recaptures some of the vitamin C that leached out.
Who Is Most at Risk Today
Scurvy sounds like a historical disease, but it still appears in modern settings. In the U.S., it most commonly affects babies, children, and older adults who aren’t eating enough fruits and vegetables. People living on what’s sometimes called a “tea and toast” diet, heavy on cheap, shelf-stable carbohydrates and light on fresh produce, are especially vulnerable.
Several other groups face higher risk:
- People with alcohol or drug dependency, whose diets often lack variety and nutrient density.
- People undergoing chemotherapy or other treatments that suppress appetite and cause nausea.
- Those with eating disorders like anorexia, where overall food intake is severely restricted.
- People with digestive conditions such as inflammatory bowel disease or chronic diarrhea, which reduce nutrient absorption.
- Smokers, who absorb less vitamin C from food and burn through it faster.
- People on very restrictive diets or with multiple food allergies that limit fruit and vegetable options.
Conditions that place extra demand on the body also increase your need. Pregnancy, breastfeeding, hyperthyroidism, recent surgery, and high fevers all raise vitamin C requirements. If your intake doesn’t rise to match, deficiency can develop even on a diet that would normally be adequate.
Early Signs of Deficiency
Scurvy doesn’t appear overnight. Symptoms develop after weeks to months of consistently inadequate vitamin C. The earliest signs are easy to dismiss: fatigue, general weakness, and irritability. As the deficiency deepens, more specific symptoms emerge. Your gums may swell, become tender, or bleed easily. Small red or purple spots can appear around hair follicles on your skin, and body hair may grow in a coiled, corkscrew pattern. Wounds heal slowly, and old scars can reopen.
These symptoms reflect what’s happening at a cellular level. Vitamin C is essential for building collagen, the structural protein that holds your skin, blood vessels, gums, and connective tissue together. Without it, your body can’t properly stabilize collagen fibers, so tissues weaken and blood vessels become fragile. The bruising, bleeding gums, and poor wound healing are all consequences of this breakdown in your body’s structural scaffolding.
Supplements vs. Food
If your diet reliably includes fruits and vegetables, you don’t need a vitamin C supplement. But for people in high-risk groups or those who struggle to eat enough produce, a basic supplement is an effective safety net. Standard vitamin C tablets (ascorbic acid) and mineral-based forms like sodium ascorbate are both well absorbed. There’s no strong evidence that one form is significantly more bioavailable than another for preventing deficiency.
Because vitamin C is water-soluble, your body excretes what it doesn’t need. This makes toxicity rare, but very high supplemental doses (well above 1,000 mg per day) can cause digestive discomfort, including nausea, cramps, and diarrhea. For prevention purposes, a supplement in the 100 to 250 mg range covers your needs with plenty of margin.
Practical Prevention Strategies
The simplest approach is building a few vitamin C-rich foods into your daily routine rather than relying on occasional large servings. A piece of fruit at breakfast and a side of vegetables at dinner is more than enough for most people. Frozen fruits and vegetables retain their vitamin C well, making them a practical and affordable alternative to fresh produce, especially out of season.
If you smoke, quitting is the most effective way to reduce your vitamin C requirement, but in the meantime, aim for an extra serving of fruit or vegetables each day to cover the additional 35 mg your body needs. If you have a digestive condition, an eating disorder, or limited access to fresh food, a low-dose daily supplement is a simple, inexpensive backup. Scurvy is one of the most preventable nutritional diseases that exists, and keeping it at bay takes remarkably little effort once you know what your body needs.