HSIS provides accurate and balanced information on vitamins, minerals and other food supplements.

We often receive enquiries from the media or from health professionals supporting people with diet and nutrition. Here are answers to some of the more common questions.

If you have a question that isn’t answered here, please contact us and we’ll be happy to help.

What is an NRV and why is it important?

NRV is an abbreviation of ‘Nutrient Reference Value’. NRV’s are set for 13 vitamins and 14 minerals for the purposes of food labelling and are EU guidance levels on the daily amount of vitamin or mineral that the average healthy person needs to prevent...

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Please note, HSIS is a communication service providing information to the media and health professionals. HSIS cannot comment on individual circumstances and we do not offer an advice service to the general public. If you are a member of the public looking for information on food supplements you could try NHS Choices or ask your local pharmacist for advice.