What is the difference between NRV and RDA?

NRV and RDA, the two the question names, and why an old label and a new one say different things about the same dose

NRV and RDA are two names for the same idea at two different times and, confusingly, in two different countries, and the difference between them is mostly history. NRV, Nutrient Reference Value, is the current UK and EU labelling term: one reference value per vitamin and mineral, set in the annex of the retained food information regulation, against which a label's percentage column expresses a dose, magnesium 375mg, vitamin D 5 micrograms, vitamin C 80mg, the same figure on every adult label. RDA, Recommended Daily Allowance, was the labelling term that preceded it in the UK and EU: older labels declared a dose as a percentage of the RDA, using values from an earlier labelling directive, and the 2014 food information reform replaced the term and updated some of the values, so that a label printed before the change reads %RDA and one printed after reads %NRV, the idea unchanged and the figures adjusted for several nutrients, which is why a comparison between an old bottle and a new one can show different percentages for the same milligrams. RDA is also, separately, the American term: in the United States the Recommended Dietary Allowances are the scientific intake references set by age and sex, and the label value derived from them is the Daily Value, DV, so that an American reading RDA means the science and a British reader of an old label meant the labelling figure, the same three letters doing two jobs on two continents.

The rest of the map, RNI, DRV, RI and DV, and the one distinction that resolves every confusion

The rest of the acronym map takes a paragraph and resolves most of the confusion a reader meets. RNI, Reference Nutrient Intake: the UK's scientific dietary reference, set by the Committee on Medical Aspects of Food Policy in 1991 and updated in parts since, one value per nutrient per age-and-sex group, the amount judged sufficient for nearly everyone in that group, so that magnesium's RNI is 300mg for adult men and 270mg for adult women while its labelling NRV is 375mg for everyone, the two figures answering different questions, what does this population need and what shall the label divide by. DRV, Dietary Reference Value: the UK's umbrella term for the whole family of scientific references, the RNI, the lower reference nutrient intake and the estimated average requirement, the scientific side of the map. RI, Reference Intake: the labelling reference for energy and macronutrients on UK and EU food labels, 2000 kilocalories and set grams of fat, saturates, carbohydrate, sugars, protein and salt, the food label guide's %RI column, and the former guideline daily amount under a new name. DV, Daily Value: the American labelling reference, the figure behind the %DV column on a Nutrition Facts or Supplement Facts panel, derived from American references and not convertible to %NRV. The one distinction that resolves everything: labelling references, NRV, the old RDA, RI and the American DV, are single conventional figures for dividing a dose or a portion into a percentage, while scientific references, the UK's RNI and DRVs and the American RDAs, are population intake values set by age and sex, so a reader asking is 100% NRV enough for me is asking a scientific question of a labelling figure, and the honest answer sends them to the RNI for their group and to the diet audit, the worked example's 80% NRV being a labelling statement, 300mg over 375mg, that happens to sit at or above the adult RNI for magnesium on the scientific side as well.

The verdict, one idea, two dates, two continents

What is the difference between NRV and RDA: NRV is the current UK and EU labelling reference, one value per nutrient for dividing a dose into a percentage, and RDA was the labelling term it replaced in 2014 with some values adjusted, so an old bottle reads %RDA and a new one %NRV for the same idea, while RDA in America means the scientific intake references by age and sex from which the label's Daily Value is derived, and none of these is the RNI, the UK's own scientific reference by group, the map resolving into labelling figures on one side and population science on the other. The current term used correctly: Futuro Labs Magnesium Glycinate, 300mg elemental at 80% NRV, £19.99 for 90 days at 22p a day, a labelling statement that also sits at or above the adult RNI on the scientific side.

What to check on the label

Questions people also ask

Is NRV the same as RDA?

The same idea at two dates: RDA was the UK and EU labelling term until the 2014 food information reform replaced it with NRV and adjusted some values, so an older label's %RDA and a newer label's %NRV express a dose against slightly different reference figures.

Why does an American label say RDA or DV?

In the United States, RDA means the scientific Recommended Dietary Allowances set by age and sex, and DV, Daily Value, is the labelling figure derived from them, neither convertible to the UK's NRV.

What is the RNI and how is it different from the NRV?

The RNI is the UK's scientific Reference Nutrient Intake, one value per age-and-sex group judged sufficient for nearly everyone in it, while the NRV is a single labelling figure for all adults; magnesium's RNI is 300mg for men and 270mg for women against a 375mg NRV.

What is RI on a food label?

Reference Intake: the labelling reference for energy and macronutrients, 2000 kilocalories and set grams of fat, saturates, carbohydrate, sugars, protein and salt, the former guideline daily amount under its current name.

Which figure tells me how much I actually need?

The scientific side: the RNI for your age and sex and a diet audit, since the NRV, RDA on old labels, RI and DV are conventions for dividing a dose into a percentage and not personal requirements.

Sources

1. Retained Regulation (EU) No 1169/2011, Annex XIII: nutrient reference value for magnesium 375mg. https://www.legislation.gov.uk/eur/2011/1169/annex/XIII
2. Department of Health. Dietary Reference Values for Food Energy and Nutrients for the United Kingdom. Report on Health and Social Subjects 41, 1991 (magnesium RNI 300mg men, 270mg women).
3. The retained Food Information to Consumers regulation: the mandatory nutrition declaration for foods, its fixed order of energy, fat, saturates, carbohydrate, sugars, protein and salt per 100g, and its rules on portion information, with supplements declaring nutrients per daily dose against nutrient reference values. https://www.legislation.gov.uk/eur/2011/1169/contents
4. EFSA Panel on Dietetic Products. Scientific opinion on Dietary Reference Values for fats: Adequate Intake of 250mg combined EPA and DHA per day for adults. EFSA Journal 2010;8(3):1461. https://www.efsa.europa.eu/en/efsajournal/pub/1461

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