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Dry skin

Dry skin is dominated by what happens to the outside of the skin — water, soap, heating, weather and time — with nutrition playing a much smaller role than the supplement market implies.

General information only, not a diagnosis. A symptom is not proof of a deficiency — most symptoms here have many possible causes, and the common ones are rarely nutritional. Do not start a supplement to treat a symptom; the safe route is a blood test if one is warranted, and a doctor to interpret it. Use the red-flag list on each page, and see a clinician for anything that persists or worries you.

The skin barrier is a layer of cells and lipids whose job is to keep water in. Anything that strips the lipids dries the skin: hot showers, frequent hand washing, alcohol gel, detergents, and indoor heating that drops the humidity of a room to desert levels for months at a time. Northern winters combine most of those at once, which is why dry skin has such a strong season.

Age is the other structural factor. Sebum production falls, barrier repair slows, and skin that was fine at thirty needs help at sixty. That is normal biology rather than a deficiency, and it responds to emollients rather than to eating differently.

Where nutrition genuinely enters is at the deficiency end. Severe essential fatty acid deficiency causes a scaly dermatitis, and it is rare outside specific clinical situations. Zinc deficiency produces a characteristic rash along with hair and healing problems. Vitamin A deficiency causes dry, rough skin — and vitamin A is also the nutrient on this page where excess does the most harm, because it accumulates, causes toxicity, and is teratogenic. More is emphatically not better.

Omega-3 and vitamin E are the two most heavily marketed for skin, and both have modest evidence. A diet containing oily fish, nuts and seeds is worth having for other reasons; the specific claim that a capsule improves dry skin in someone eating adequately is not well supported.

Dry skin that is itchy enough to disturb sleep, that is spreading, that is accompanied by a rash, or that arrives with thirst, weight change or feeling cold, is a different conversation — those patterns point at eczema, thyroid disease, diabetes and liver or kidney conditions, all of which are worth ruling in or out.

Nutrients commonly discussed for dry skin

Each nutrient below is rated for how strong the evidence is that it relates to this symptom. "Relevant only if you are deficient" means it can matter when your level is genuinely low, but topping it up when it is not low does nothing.

Omega-3 Weak evidence

Heavily marketed for skin with modest supporting evidence in people who eat adequately. Severe essential fatty acid deficiency does cause a scaly dermatitis, but it is rare outside specific clinical situations.

Vitamin A Relevant only if you are deficient

Deficiency causes dry, rough skin. Also the nutrient here where excess does the most damage: it accumulates, causes toxicity and is harmful in pregnancy. This is not a nutrient to supplement without advice.

Full ranking: foods highest in vitamin a.

Zinc Relevant only if you are deficient

Frank deficiency produces a recognisable rash together with hair loss and impaired healing. Uncommon in mixed diets, and long-term supplements interfere with copper.

Full ranking: foods highest in zinc.

Vitamin E Weak evidence

Popular in topical and oral form with limited evidence for dry skin. High-dose supplements have their own bleeding-risk caveat.

Full ranking: foods highest in vitamin e.

Vitamin C Relevant only if you are deficient

Needed for collagen synthesis, so severe deficiency affects skin. Relevant to scurvy, not to a dry winter.

Full ranking: foods highest in vitamin c.

Source: Foods richest in each nutrient: USDA FoodData Central SR Legacy (public domain), per 100 g · checked 2026-09-02

Causes that are usually more likely

Before a nutrient, these are the explanations a clinician would normally consider first for dry skin:

• Hot showers and frequent washing
• Soaps, detergents and alcohol hand gel
• Indoor heating and low winter humidity
• Age — falling sebum production and slower barrier repair
• Eczema, psoriasis and contact dermatitis
• Underactive thyroid
• Diabetes, kidney and liver conditions
• Some medicines, including retinoids and diuretics

When to see a doctor

Treat these as reasons to seek a professional opinion rather than to self-treat:

• Itch severe enough to disturb sleep, especially without a visible rash
• Dry skin with thirst, passing more urine, or unexplained weight loss
• Yellowing of the skin or eyes
• A spreading rash, blistering, or skin that is breaking down
• Dry skin with feeling cold, constipation and tiredness
• Skin changes after starting a new medicine

This list is not exhaustive, and a symptom that is severe, persistent or getting worse always deserves a professional opinion. If you feel very unwell, seek urgent care rather than reading further.

Frequently asked questions

Other symptoms

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