What does NRV mean on a food label?

NRV in plain English

NRV stands for Nutrient Reference Value. It replaced the older term Reference Daily Allowance (RDA) when EU labelling rules were updated, and those rules carried over into UK law after Brexit. You will still see "RDA" on older packaging, but it means the same thing.

NRVs only apply to vitamins and minerals, not to calories, fat, sugar, salt, or protein. Those macronutrients use a different reference system entirely (more on that below). The values themselves are set by the European Food Safety Authority (EFSA) and adopted into the UK regulatory framework. They represent a reference point for an average adult's daily intake, not a clinical prescription.

A short table of common NRVs you will encounter on labels:

What the percentage tells you

When a label says a serving provides 25% NRV vitamin D, it means the food supplies a quarter of the daily NRV for vitamin D in that one portion. If you stack meals across a full day and the percentages for a given nutrient add up to 100%, you have cleared the target from food alone.

In practice, most people do not do this arithmetic in real time. The figure is still useful as a rough guide. A serving contributing 2% NRV of calcium is a small input. One contributing 40% NRV is doing meaningful work. The percentage lets you compare products at a glance without needing to know the absolute milligram amounts.

NRV is not the same as RI

Food labels often carry two different reference systems side by side. Many people assume they are the same thing. They are not.

NRV is the system for vitamins and minerals. It lives in the detailed nutritional panel, usually in a smaller table below the main figures.

RI stands for Reference Intake. It is the system for the main macronutrients and energy: 2000kcal of energy, 70g of fat, 90g of carbohydrate, 20g of sugars, 50g of protein, and 6g of salt per day for a typical adult. RI figures are what the traffic-light labels on the front of pack refer to, and what the main nutritional panel expresses as a percentage.

So when you see 20% RI next to the calorie count and 15% NRV next to vitamin C, those are two entirely separate calculations against two entirely separate reference frameworks. One tells you about energy and macros; the other tells you about vitamins and minerals.

The legal definitions of "source of" and "high in"

Claims on packaging like "source of calcium" or "high in vitamin C" are not loose marketing phrases. They are legally defined in EU Regulation 1924/2006, which is retained in UK law.

The thresholds work like this:

A breakfast cereal carrying "high in vitamin D" on the front of the box is legally required to deliver at least 30% NRV of vitamin D per labelled serving. The same threshold applies to every vitamin and mineral, regardless of the absolute amount involved.

These claims require substantiation, so if a product carries one, the number will be on the back label to verify. It is one of the few areas of food labelling where the front-of-pack claim is directly checkable against the nutritional panel.

Why some NRVs differ from NHS recommendations

Here is the part that trips people up. The NRV figures on food labels are not always the same as the amounts the NHS recommends. Vitamin D is the clearest example.

The label NRV for vitamin D is 5µg per day. That is the figure the %NRV calculation on packaging uses. So a cereal providing "50% NRV vitamin D" is giving you 2.5µg per serving.

The NHS recommendation for vitamin D is 10µg per day, based on guidance from the Scientific Advisory Committee on Nutrition (SACN). The NHS recommends that everyone aged four and over consider taking a 10µg supplement through autumn and winter, when sunlight is too weak for the skin to produce enough.

Both numbers are real. They come from different processes. The EFSA label NRV was set using older methodology; SACN updated the UK recommendation in 2016 using a more conservative threshold for sufficiency. The label maths is internally consistent, but if you are trying to meet the NHS daily recommendation, the label percentage slightly overstates your progress. A serving showing 50% NRV of vitamin D gets you to 2.5µg, which is 25% of the NHS's 10µg target, not 50%.

Vitamin D is the most pronounced example, but the principle applies elsewhere too. The NRV for vitamin C is 80mg; some studies and clinical guidelines use different figures depending on context. The label NRV is a reasonable population-level reference, not a clinical one.

Why daily label reading is hard

Tracking %NRV across four or five foods in a day is genuinely difficult to do by hand. You would need to note the percentage for each nutrient from each food, then add them up. Most people do not bother, which means most people have no idea where they actually land across the twenty-seven vitamins and minerals that carry NRVs on UK labels.

That is the problem the app is built to solve. As you log meals during the day, it tots up your %NRV for each nutrient in the background, using the same reference values you see on food labels. The tracker shows which ones you have cleared and which are still short, without any arithmetic on your part. If something is running low, you can tap it to see which foods would move the number.

A short, honest note

NRV is a useful population-level guide, not a clinical target tailored to you. Individual requirements vary with age, sex, health status, pregnancy, and other factors. If you are concerned about a specific nutrient, a conversation with your GP or a registered dietitian will give you a more precise picture than any food label can.