Vitamin C supports normal immune function, but taking a large dose after a cold starts is unlikely to make it disappear. Regular intake may shorten symptoms slightly in some circumstances, yet the effect for most people is modest. Rest, fluids and time remain more important.
Oranges are only one source. Peppers, broccoli, potatoes, berries and tinned fruit can all contribute, and a varied diet will usually provide enough without an effervescent tablet. High-dose supplements can cause stomach upset and may be unsuitable for people with a history of some kidney stones.
Seek advice if a supposed cold comes with breathing difficulty, chest pain, confusion, dehydration, a persistent high fever or symptoms that are worsening rather than settling. Food can support recovery, but it should not delay appropriate care.
This article offers general information and does not replace advice from someone who knows your medical history. If you are pregnant, take regular medicine or live with a long-term condition, speak to your GP, nurse, pharmacist or a registered dietitian before making a major change to the way you eat.
Peppers, broccoli, Brussels sprouts, kiwi, berries, citrus fruit and potatoes all provide vitamin C. Frozen fruit and vegetables remain useful, and tinned fruit in juice can help when fresh prices rise.
Variety is more dependable than relying on oranges alone. Include these foods in meals you already cook rather than creating a separate cold-season shop.
Most adults can meet vitamin C needs through a varied diet. Supplements containing very large doses exceed routine requirements and can cause digestive side effects.
Daily food matters more than taking several tablets after symptoms begin. People with specific medical needs or very restricted diets can ask a pharmacist or clinician for advice.
Orange juice, wellness shots and vitamin C tablets do not prevent COVID or influenza. Vaccination, ventilation and hygiene have separate and more important roles.
Zinc lozenges have different evidence and potential side effects, so do not treat every product in the cold aisle as interchangeable.
Eating when appetite is low
When appetite is low, use small easy meals such as soup, scrambled eggs or yoghurt with fruit. Fluids and enough overall food matter more than chasing a particular vitamin.
A freezer soup or simple cupboard meal is valuable because it asks little of the person who is unwell.
Children commonly catch several viral infections each year. Offer fluid and food according to appetite, use medicines only at the correct child dose and follow vaccination advice.
Honey may soothe cough in children over one year but must never be given under one. Seek help for breathing difficulty, dehydration, unusual drowsiness or other concerning symptoms.
Stock vitamin C without a specialist aisle
Keep frozen berries, peppers, broccoli or another reliable source in the normal shop. They can move through porridge, soup and stir-fry without a special supplement routine.
The aim is to make varied food available throughout winter, not to stockpile products after the first sneeze.