“Optimum nutrition is the medicine of tomorrow.”

Linus Pauling, PhD, Nobel laureate

The Institute for Optimum Nutrition (ION) was founded in 1984 by Patrick Holford with the support of twice Nobel Prize winner Dr Linus Pauling

ION is a higher education institution.  Established over thirty years ION is one of the most respected training bodies of its kind in Europe.

Our flagship Nutritional Therapy diploma courses educate students to become registered Nutritional Therapists on accredited professional qualification programmes.  We champion our graduates and the wider nutrition and healthcare industry with our professional CPD courses.  Our nutrition clinic, food education days and magazine Optimum Nutrition support the public to make a positive impact on their lives with food.

Nutritional Therapy Diploma Course

For over 30 years the Nutritional Therapy Diploma Course has combined the latest theoretical knowledge from the science of nutrition with “real-world” clinical training to help you build an in-depth understanding of the role that nutrition plays in relation to human health and wellbeing.


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Short courses

Discover exciting opportunities to deepen your knowledge and support your professional development through a range of Practitioner CPD events and Food Demo Days.


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Open events

If you want to find out more about the courses you should register for an open event, you can either attend our Richmond site or join us online for a webinar.


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Optimum Nutrition magazine

Optimum Nutrition is published four times a year and brings you the latest news, research, updates, forthcoming events, healthy recipes and much more... Sign up today for free digital access.


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Optimum Nutrition Clinic

Our fully qualified Nutritional Therapists work with people every day to improve health and wellbeing, whatever your issue, they will help you find out how to improve your health naturally and safely.




Latest articles and recipes

  • Slow-Cooked Roast Chicken Broth

    Nicola Moore shows us how to make an appetising chicken broth - ideal if you’re feeling under the weather this wet November Read more

  • Five Minutes with Katie Shore

    We find out why barrister Katie Shore decided to retrain as a nutritional therapist with ION after working in criminal justice for more than a decade. Read more

  • Obesity inhibits key cancer defence mechanism

    Scientists at Hokkaido University in Japan have discovered how obesity impacts a natural mechanism that usually protects against cancers. Read more