5 Nutrients That Help Wounds Heal

Quick answer: The five nutrients that matter most for wound healing are protein, vitamin C, zinc, vitamin A, and iron. Protein provides the building blocks for new tissue, vitamin C is essential for collagen synthesis, zinc drives cell growth and immune function, vitamin A supports epithelial repair, and iron carries oxygen to the healing site. A 2026 systematic review of 18 randomised trials found that nutrition enriched with protein, vitamin C, and zinc reduced pressure injury healing time by about 25% compared with standard care. Most people eating a normal diet get enough of these nutrients, but older adults, people with poor appetite, and those on weight loss medication may not. If you have a wound that is slow to heal, ask your doctor or dietitian whether a supplement is appropriate rather than starting one on your own.

When someone has a wound that is not healing, the first thing everyone thinks about is the dressing. Is it the right type? Is it being changed often enough? Should it be moist or dry? Those questions matter. But what is happening inside the body matters just as much. A dressing creates the right environment for healing. Nutrition provides the raw materials. Without the raw materials, even the best dressing in the world cannot make new tissue grow.

This guide walks through the five nutrients that have the strongest evidence for wound healing, what happens when you are deficient, how much you need, and where to get it. It also covers when a supplement might help and when it is unnecessary.

Why does nutrition matter for wound healing?

Wound healing is one of the most metabolically demanding processes the body goes through. In the first few days after an injury, your metabolic rate can rise by 15% to 50% above normal, depending on the size and severity of the wound. Your body needs extra energy, extra protein, and extra micronutrients to build new blood vessels, lay down collagen, and regenerate the skin surface.

When nutrition is inadequate, wounds stall. They get stuck in the inflammatory phase, they fail to build new tissue, and they become vulnerable to infection. The evidence is consistent across multiple wound types. A 2021 Cochrane review of nutritional interventions for pressure ulcers found that nutritional supplementation improved healing in people who were malnourished or at risk of malnutrition. A 2023 review in the Journal of Wound Care found that up to 50% of people with chronic wounds have some form of nutritional deficiency, and that correcting those deficiencies is associated with faster healing.

The people most at risk are older adults, who may have reduced appetite and reduced nutrient absorption, people with chronic wounds such as diabetic foot ulcers or venous leg ulcers, people who are unhoused or food-insecure, and people on medications that suppress appetite, including GLP-1 receptor agonists. If you fall into any of these groups and you have a wound, it is worth talking to a dietitian or doctor about your nutrition.

What does protein do for wound healing?

Protein is the single most important nutrient for wound healing, and it is the one most people do not get enough of when they are healing. New tissue is built primarily from protein. Collagen, the main structural protein in skin and connective tissue, makes up about 70% to 80% of the dry weight of skin. Every gram of new collagen requires amino acids from dietary protein.

When protein intake is inadequate, the body breaks down its own muscle to supply the amino acids needed for healing. This is why people with chronic wounds often lose muscle mass. The recommended protein intake for someone with a wound is 1.2 to 1.5 grams of protein per kilogram of body weight per day, and for severe wounds or burns, up to 2.0 grams per kilogram. For a 70 kilogram person, that is 84 to 140 grams of protein per day, compared with the standard recommendation of about 56 grams for a sedentary adult.

Good sources include meat, fish, eggs, dairy, legumes, and tofu. If appetite is poor or dietary intake is insufficient, a protein supplement such as whey protein isolate or a plant-based protein powder can help. For people who are truly malnourished, a high-protein, high-calorie oral nutritional supplement may be prescribed, and these have been shown in multiple trials to improve wound healing outcomes.

Why is vitamin C essential for collagen?

Vitamin C, also called ascorbic acid, is a cofactor for the enzymes that build collagen. Without vitamin C, the body cannot form stable collagen molecules, and the collagen it does produce is weak and disorganised. Severe vitamin C deficiency causes scurvy, one of the classic signs of which is poor wound healing and bleeding gums.

The recommended daily intake for vitamin C is 45 milligrams for adults in Singapore, but for someone with a wound, 100 to 200 milligrams per day is often recommended, and some guidelines suggest up to 1000 milligrams per day for people with severe burns or large wounds. Vitamin C is water-soluble, so excess amounts are excreted in urine rather than stored, but very high doses, above 2000 milligrams per day, can cause diarrhoea and stomach cramps.

Good food sources include citrus fruits, bell peppers, strawberries, kiwi, broccoli, and tomatoes. One medium orange contains about 70 milligrams of vitamin C, one cup of raw bell pepper contains about 95 milligrams, and one cup of strawberries contains about 85 milligrams. A supplement is reasonable if dietary intake is low, but for most people eating fruit and vegetables daily, it is unnecessary.

How does zinc help wounds heal?

Zinc is involved in over 300 enzyme reactions in the body, including many that are critical for wound healing. It plays a role in cell division and growth, immune function, protein synthesis, and collagen formation. Zinc deficiency is associated with delayed wound healing, impaired immune function, and skin lesions.

The recommended daily intake for zinc is about 8 to 11 milligrams for adults, but for someone with a wound, 15 to 30 milligrams per day is often recommended. Zinc deficiency is more common in older adults, people who drink alcohol heavily, people with digestive conditions that affect absorption, and people on long-term antibiotic therapy. A 2020 review found that zinc supplementation improved wound healing in people who were zinc-deficient, but did not show a benefit in people who already had adequate zinc levels. This is an important point: more is not better, and supplementing zinc when you are not deficient does not help and may cause harm.

Long-term high-dose zinc, above 40 milligrams per day for more than a few months, can interfere with copper absorption and lead to copper deficiency, which itself causes anaemia and neurological problems. Good food sources of zinc include oysters, red meat, poultry, nuts, seeds, and legumes. If you are considering a zinc supplement for a wound, ask your doctor to check your zinc level first.

What role do vitamin A and iron play?

Vitamin A is important for epithelial repair, which is the process of regenerating the skin surface over a wound. It also supports immune function and the inflammatory response that is necessary for healing. Vitamin A deficiency is associated with delayed epithelialisation and increased risk of wound infection. The recommended daily intake is about 600 to 900 micrograms of retinol activity equivalents per day. Good sources include liver, dairy products, eggs, and orange and yellow vegetables such as carrots and sweet potatoes, which contain beta-carotene that the body converts to vitamin A. Vitamin A is fat-soluble, so excess intake can be toxic, particularly in pregnancy, so supplements should be used with caution and under medical guidance.

Iron is essential for oxygen transport in the blood. Wound healing requires oxygen, and if iron levels are low, the healing site does not get enough oxygen and healing slows. Iron deficiency anaemia is common in people with chronic wounds, particularly older women and people with conditions that cause slow blood loss. The recommended daily intake is about 10 to 18 milligrams of elemental iron per day, depending on age and sex. Good sources include red meat, poultry, fish, legumes, and fortified cereals. Iron from plant sources is less well absorbed than iron from animal sources, but consuming it with vitamin C improves absorption. Iron supplements can cause constipation and stomach upset, and should be taken under medical guidance because excess iron can be toxic.

Nutrient	What it does for wounds	Daily target (healing)	Best food sources	Supplement caution
Protein	Builds collagen and new tissue	1.2-1.5g/kg body weight	Meat, fish, eggs, dairy, legumes	Kidney disease may require restriction
Vitamin C	Cofactor for collagen synthesis	100-200mg (up to 1000mg severe)	Citrus, bell peppers, strawberries, kiwi	Above 2000mg/day causes diarrhoea
Zinc	Cell growth, immune function, collagen	15-30mg	Oysters, red meat, nuts, seeds	Long-term high dose depletes copper
Vitamin A	Epithelial repair, immune function	600-900mcg RAE	Liver, eggs, dairy, carrots, sweet potato	Fat-soluble, excess toxic in pregnancy
Iron	Oxygen transport to healing site	10-18mg elemental	Red meat, poultry, fish, legumes	Constipation, excess toxic, test first

Should you take a supplement for wound healing?

The short answer is: only if you are deficient or your dietary intake is genuinely inadequate. For a healthy adult eating a balanced diet with enough protein, fruit, and vegetables, a multivitamin is unlikely to speed up wound healing. The evidence consistently shows that nutritional supplementation helps people who are malnourished or at risk of malnutrition, but does not show a benefit for people who are already well-nourished.

That said, if you have a chronic wound that is not healing, if you are an older adult with a poor appetite, if you have lost weight without trying, or if you are on medication that suppresses your appetite, it is worth asking your doctor for a blood test to check your protein levels, iron, vitamin D, zinc, and vitamin B12. If any of these are low, correcting them with diet or supplements under medical guidance can make a real difference to how quickly your wound heals.

There are also specialised oral nutritional supplements designed for wound healing, often high in protein with added arginine, vitamin C, and zinc. These have been studied in people with pressure ulcers and diabetic foot ulcers, and some trials have shown improved healing. They are generally prescribed by a doctor or dietitian rather than bought over the counter, because they are designed for people with specific nutritional needs.

This content is for educational purposes only and does not replace medical advice. If you have a wound that is not healing, consult your doctor, wound care nurse, or dietitian for personalised guidance.

Frequently asked questions

What is the best vitamin for wound healing?

There is no single best vitamin because wound healing requires a combination of nutrients. Protein is the most important overall, followed by vitamin C for collagen synthesis, zinc for cell growth and immune function, vitamin A for skin surface repair, and iron for oxygen delivery. For most people eating a balanced diet, these are obtained from food. A supplement helps only if you are deficient or your intake is inadequate.

How much protein do I need to heal a wound?

The recommended intake for wound healing is 1.2 to 1.5 grams of protein per kilogram of body weight per day, and up to 2.0 grams per kilogram for severe wounds or burns. For a 70 kilogram person, that is 84 to 140 grams per day, compared with about 56 grams for a sedentary adult. Good sources include meat, fish, eggs, dairy, legumes, and protein supplements if appetite is poor.

Can vitamin C help a wound heal faster?

Vitamin C is essential for collagen synthesis, and severe deficiency causes scurvy with poor wound healing. If you are deficient in vitamin C, supplementing will help. If you already eat enough fruit and vegetables, extra vitamin C beyond the recommended intake has not been shown to speed healing in well-nourished people. For someone with a wound, 100 to 200 milligrams per day is a reasonable target, with higher doses only under medical guidance.

Does zinc help wounds heal?

Zinc plays a role in cell growth, immune function, and collagen formation, and zinc deficiency is associated with delayed wound healing. Supplementing zinc helps people who are deficient, but does not show a benefit in people with adequate zinc levels. Long-term high-dose zinc can deplete copper, so if you are considering a supplement, ask your doctor to check your zinc level first rather than taking it blindly.

What foods help wounds heal faster?

The best foods for wound healing are those high in protein, vitamin C, zinc, vitamin A, and iron. Examples include chicken, fish, eggs, Greek yoghurt, lean red meat, citrus fruits, bell peppers, strawberries, kiwi, oysters, nuts, seeds, carrots, sweet potatoes, and leafy green vegetables. The key is eating enough overall, particularly protein, rather than focusing on one single "superfood." If appetite is poor, smaller, more frequent meals and protein-rich snacks can help.