Which Vitamins Are UK Adults Actually Missing in 2026?

Last reviewed: 28 May 2026

We're NutraSafe — a UK food diary that tracks vitamins and minerals against UK Reference Intakes. "Am I getting enough vitamins?" is the question we hear most often, and the honest answer requires UK data, not US health-blog generalisations. The single best UK source is the government's National Diet and Nutrition Survey, latest results covering 2019-2023. Here's what it actually shows for UK adults, who's most at risk for each nutrient, the food sources to look for, and how to check your own diet against UK targets.

Sources: National Diet and Nutrition Survey 2019-2023 (UK Office for Health Improvement and Disparities), NHS vitamins and minerals guidance, and the Scientific Advisory Committee on Nutrition (SACN). We're a tracking tool, not a clinic — if you're worried about a specific deficiency, see your GP.

One thing to clear up first: "deficiency" and "low intake" aren't the same thing. The NDNS measures intake (what people eat) and status (blood biomarkers) separately. Some nutrients show up as low intake but acceptable status because the body adapts; others show up as fine intake on paper but poor status because absorption or recycling is the issue. Where the figures below are striking, they're the genuine population-level concerns the UK Office for Health Improvement and Disparities has flagged.

1. Vitamin D — the UK's most consistent gap

What the NDNS shows: Around 18% of UK adults aged 19-64 had low vitamin D status (plasma 25-hydroxyvitamin D below 25 nmol/L) over the 2019-2023 survey years. Status is worst in winter and spring. Among adults aged 65+, around 16% were below the threshold. People with darker skin had substantially lower status across all age groups.

Why the UK specifically: Between October and March, UK latitude means sunlight isn't strong enough for the skin to synthesise vitamin D — regardless of how much time you spend outside. SACN reviewed UK vitamin D status in 2016 and set the Reference Nutrient Intake (RNI) at 10 micrograms per day for everyone aged 5 and over. That figure assumes minimal sun exposure.

NHS guidance: "Take a daily supplement containing 10 micrograms of vitamin D between October and early March, when most people get most of their vitamin D from sunlight." Year-round if you have dark skin, are housebound, or cover your skin when outdoors.

Food sources: Oily fish (salmon, mackerel, sardines, fresh tuna), egg yolks, fortified breakfast cereals, fortified plant-milks, red meat in smaller amounts. UK food alone rarely gets the average adult to 10 micrograms a day in winter, which is why the NHS supplement guidance exists.

See vitamin D deficiency symptoms (UK) and UK foods high in vitamin D for the longer reads.

2. Folate — 83% of women of childbearing age below the WHO threshold

What the NDNS shows: 83% of women of childbearing age (16-49) had red-cell folate below the WHO threshold for neural-tube-defect risk (305 nmol/L). That figure shocked policymakers — it's the headline NDNS finding of the last decade.

Why it matters: Low folate at conception raises the risk of neural-tube defects (spina bifida, anencephaly). The window matters: folate needs to be sufficient before pregnancy and through the first 12 weeks, often before someone knows they're pregnant.

UK policy response: The UK announced mandatory folic-acid fortification of non-wholemeal wheat flour, with the regulation due to take effect by the end of 2026. That should raise population-level folate intake without anyone needing to do anything different at the shelf.

NHS guidance: 400 micrograms folic acid per day before conception and through the first 12 weeks of pregnancy. Higher dose (5 milligrams) for women with diabetes, on epilepsy medication, or with a previous neural-tube-defect pregnancy — on prescription.

Food sources: Leafy greens (spinach, broccoli, kale, Brussels sprouts), pulses (chickpeas, lentils, kidney beans), fortified breakfast cereals, asparagus, oranges, brown rice, peas.

3. Iron — younger women and teenage girls hit hardest

What the NDNS shows: 25% of girls aged 11-18 had iron intakes below the Lower Reference Nutrient Intake (LRNI — the level below which deficiency is likely in most people). 21% of women aged 19-64 had intakes below the LRNI. Mean intakes have fallen over successive NDNS waves.

Why women specifically: Menstrual blood loss raises iron requirements substantially. The UK RNI for women aged 19-50 is 14.8 mg/day; for men 19-50, 8.7 mg/day. The drop in red-meat consumption — without a matching rise in iron-rich plant sources or fortified foods — has widened the gap.

Symptoms to know: Fatigue, breathlessness on stairs, pale skin, brittle nails, restless legs. Iron deficiency in the UK is one of the most common reasons for a GP blood test in younger women.

Food sources: Red meat (beef, lamb), liver, dark poultry meat, oily fish; for plant sources, pulses (lentils, chickpeas), tofu, dark leafy greens, fortified breakfast cereals, dried apricots. Plant-source iron is non-haem and absorbs less well than meat iron — pair it with a vitamin C source in the same meal (orange juice, peppers, tomatoes) for better absorption. Tea and coffee with the meal reduce absorption; leave them until later.

See iron deficiency symptoms (women, UK) and UK iron-rich foods for women for the longer reads.

4. Iodine — falling, alongside dairy intake

What the NDNS shows: Among women aged 16-49, around half had iodine intakes below the LRNI. Median urinary iodine concentration is in the lower band of WHO's "adequate" range. Iodine status has slipped as cow's-milk consumption has fallen — milk and dairy supply roughly a third of UK iodine intake.

Why it matters: Iodine is essential for thyroid hormone, and adequate iodine in pregnancy is critical for foetal brain development. Plant-milks are mostly not fortified with iodine in the UK; if you've switched to oat, almond or soya milk for ethical or dietary reasons, your iodine intake may have dropped without you noticing.

UK RNI: 140 micrograms per day for adults; 200 micrograms in pregnancy and breastfeeding (set by the World Health Organization).

Food sources: Cow's milk and dairy (yogurt, cheese), white fish (cod, haddock), shellfish, eggs, seaweed (very high — easy to overshoot). If you avoid dairy, look for an iodine-fortified plant-milk or speak to a dietitian. Iodised table salt isn't standard in the UK the way it is in many other countries.

5. Magnesium — meaningful minorities below LRNI

What the NDNS shows: 12% of UK adult women and 11% of UK adult men had magnesium intakes below the LRNI. Among teenage girls (11-18), it's around 50%.

Why: Magnesium-rich foods cluster in wholegrains, nuts, seeds and leafy greens — categories UK diets have moved away from over the past decades, replaced by refined-grain products that strip the magnesium during processing.

UK RNI: 270 mg/day for women aged 19+; 300 mg/day for men aged 19+.

Food sources: Wholegrains (brown rice, wholemeal bread, oats), nuts (almonds, cashews), seeds (pumpkin, chia, flax), dark chocolate (70%+), leafy greens (spinach, kale), pulses (black beans, chickpeas), bananas.

See magnesium deficiency symptoms (UK) and UK foods high in magnesium for the longer reads.

6. Selenium — a third of UK adults below the LRNI

What the NDNS shows: Around 31% of UK adults aged 19-64 had selenium intakes below the LRNI. Selenium status in the UK is notably lower than in many other developed countries.

Why the UK specifically: Selenium content of food is driven largely by selenium in the soil where the food was grown. UK soils are low in selenium compared to the soils that produce most US-grown wheat, which is where much of the UK's wheat selenium historically came from. Since the UK has shifted toward European-grown wheat (lower in selenium), population selenium intake has fallen.

UK RNI: 60 micrograms/day for women; 75 micrograms/day for men.

Food sources: Brazil nuts (very high — two to three a day cover the RNI on their own), fish, eggs, poultry, organ meats. Brazil nuts vary widely in selenium content batch-to-batch, so spreading the load across other sources is more reliable than relying on Brazil nuts alone.

7. Vitamin B12 — specific risk groups, not the population

What the NDNS shows: Population-level B12 intakes are mostly above the RNI, but specific risk groups stand out. People aged 65+ have lower B12 status (partly because of reduced stomach-acid production with age, which impairs absorption). Vegans without supplementation will be deficient — B12 is essentially absent from plant foods unless fortified.

UK RNI: 1.5 micrograms/day for adults. Easy to hit from animal foods; impossible to hit from unfortified plant foods.

NHS guidance: Vegans should take a B12 supplement or eat B12-fortified foods (some breakfast cereals, plant milks, nutritional yeast). Adults aged 65+ with symptoms (fatigue, pins and needles, low mood) should ask their GP about checking B12 status — symptoms of B12 deficiency overlap with several other conditions, so it's worth investigating properly.

Food sources: Meat, fish, eggs, dairy. For vegans, fortified plant milks, fortified breakfast cereals, nutritional yeast, fortified meat alternatives.

See vitamin B12 deficiency symptoms (UK) and B12-rich foods for vegans (UK) for the longer reads.

8. Calcium and zinc — under-the-radar dips

Calcium: Around 5% of UK adults are below the LRNI, but the figure rises sharply for younger women (11-18: around 25% below LRNI) and falls again in older adults. The shift from full-fat dairy to plant alternatives matters here too — many plant milks aren't fortified with calcium. UK RNI: 700 mg/day for adults.

Zinc: Around 7% of UK adults below the LRNI; the figure is higher in vegan and vegetarian groups because zinc absorbs less well from plant sources. UK RNI: 7 mg/day for women; 9.5 mg/day for men.

Food sources: Calcium — milk, cheese, yogurt, calcium-fortified plant milks, sardines and pilchards (eaten with bones), tofu set with calcium sulphate, leafy greens. Zinc — meat, shellfish (oysters very high), pulses, nuts, seeds, wholegrains.

"Eat a balanced diet" — what's actually in the Eatwell Guide

The phrase "balanced diet" is often invoked but rarely defined. The NHS Eatwell Guide is the UK's actual recommendation, and it's specific:

• At least a third of your plate from fruit and vegetables (the "5 a day", with variety encouraged across colours)
• A third from starchy carbohydrates, choosing wholegrain versions where possible (wholemeal bread, brown rice, wholegrain pasta)
• Some dairy or dairy alternatives (the latter ideally calcium-fortified and ideally iodine-fortified — most aren't yet)
• Some protein from pulses, fish (2 portions a week, 1 oily), eggs, meat (limit red meat to 70 g/day on average per SACN)
• Small amounts of unsaturated oils and spreads
• Less of foods high in salt, sugar and saturated fat
• 6-8 glasses of fluid a day

The Guide is sound, but it's a population-level recommendation that doesn't tell you whether your diet hits the specific micronutrient targets. That's where individual tracking against UK Reference Intakes shows up — what you'd see across a week against the 14 vitamins and 13 minerals the UK NRV system labels.

How to check your own intake against UK targets

If you want to see where you sit specifically — not the population average — log a typical week of meals and check totals against UK NRVs. The UK NRV (Reference Intake) is what UK food labels use; it's the figure printed as the % column on the nutrition panel of any packaged product sold in the UK. They're set by the EU/UK and adopted on UK labels — they're not the same as US RDAs, which are typically higher and use different methodology.

Our app, NutraSafe, tracks 14 vitamins and 13 minerals against UK NRVs across whatever you log. Vitamin and mineral tracking is a Pro feature — £3.99/month, iOS, monthly only. The free tier covers food logging and the barcode scanner, but not the vitamin / mineral panel against UK NRVs.

If you'd rather not use an app: keep a paper week-long log and cross-check against the NHS Eatwell Guide. It's more work but the same idea — a representative week, not your "best" day.

When to take it to a GP rather than a tracker

A diet tracker is the right tool for "am I getting enough on paper". It's the wrong tool for diagnosing a deficiency — that's a blood test. Reasons to see a GP rather than just track:

• Persistent fatigue, low mood or cognitive symptoms that aren't lifestyle-explained
• Suspected iron deficiency (heavy periods, breathlessness, pallor, restless legs)
• Suspected B12 deficiency (pins and needles, balance issues, glossitis, especially if over 60 or vegan without supplementation)
• Any concern about pregnancy or fertility (folate especially)
• Switching to a vegan diet without prior dietetic input
• Chronic conditions that affect absorption (coeliac disease, Crohn's, gastric surgery)

Tracker data is something to take with you to the GP, not something to use instead of the GP.

FAQs

Which vitamins do UK adults most commonly run short on?

Per the UK NDNS 2019-2023 dataset, the nutrients most often low across UK adults are vitamin D, folate (women of childbearing age in particular), iron (younger women especially), iodine, magnesium and selenium. These aren't "deficiencies" across the whole population — they're risk groups within it.

Do I need to take vitamin supplements in the UK?

The NHS recommends a daily 10 microgram vitamin D supplement for everyone in the UK during autumn and winter (October to March), and year-round for people with darker skin, who are housebound, or who cover their skin when outdoors. The NHS also recommends 400 micrograms folic acid before conception and through the first 12 weeks of pregnancy. For other nutrients, the NHS position is food-first — supplement only if your diet, life stage or condition justifies it.

How much vitamin D should adults take in the UK?

The NHS guidance is 10 micrograms (400 IU) per day from October to March for everyone aged 5 and over in the UK, and year-round for at-risk groups (darker skin, housebound, covering skin outdoors). The UK RNI for adults is also 10 micrograms per day.

Which foods contain the vitamins UK adults most often miss?

Vitamin D — oily fish, egg yolks, fortified breakfast cereals. Folate — leafy greens, pulses, fortified breakfast cereals (and from 2026, fortified flour). Iron — red meat, pulses, dark leafy greens, fortified cereals; pair plant iron with vitamin C. Iodine — milk, dairy, white fish. Magnesium — wholegrains, nuts, seeds, leafy greens. Selenium — Brazil nuts (two to three a day), fish, eggs.

How do I check if I'm getting enough vitamins from my diet?

Log a typical week of meals and check the totals against UK Reference Intakes. The NHS Eatwell Guide and SACN nutrient reference data are the UK sources to use — not US RDAs. Our app, NutraSafe, tracks 14 vitamins and 13 minerals against UK NRVs (Reference Intakes — the EU/UK label values) so you can see across a week where you consistently miss. NutraSafe Pro is £3.99/month on iOS.

What's the difference between UK NRVs and US RDAs?

UK Reference Intakes (the % on UK food labels) are set by the EU/UK food authorities and reflect requirements assessed by SACN and EFSA. US Recommended Dietary Allowances are set by the US Institute of Medicine and use a different methodology. The values are typically different — for vitamin D the UK RNI is 10 micrograms and the US RDA is 15 micrograms; for iron in adult women the UK RNI is 14.8 mg and the US RDA is 18 mg. If you want to check against UK targets, use UK figures.

Should I be worried about a vitamin deficiency if I feel fine?

Most deficiencies have a long lag between intake dropping and clinical symptoms appearing. Vitamin D status can be low for months without any obvious symptoms; iron stores can be running down for a year before fatigue becomes noticeable. The NDNS data finds substantial subclinical deficits across UK adults who feel essentially well. That's not a reason to panic — it's the reason the NHS recommends seasonal vitamin D for everyone, and food-first habits for the rest.

Try our app for yourself

Vitamin and mineral tracking against UK NRVs is a Pro feature in NutraSafe — alongside AI Coach, AI meal scan, allergen warning detail, full reaction-pattern analysis, fasting, and workouts. NutraSafe Pro is £3.99/month, iOS, monthly only.

The free tier — food scanner, diary, reactions — is free to download. Useful for the food side first; if you want the vitamin and mineral panel on top, Pro is one tap.

If you're worried about a specific deficiency, see your GP. A blood test is the only way to know your status; a tracker is the input to that conversation, not a replacement for it.