“Optimum nutrition is the medicine of tomorrow.”

Linus Pauling, PhD, Nobel laureate

ION was founded in 1984 by Patrick Holford with the support of twice Nobel Prize winner Dr Linus Pauling

The Institute for Optimum Nutrition (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

The Nutritional Therapy Diploma Course (NTDC) combines 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. As the provider of one of the UK’s longest running Nutritional Therapy Diploma Course, we have trained professionals from around the world for over 30 years.


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Practitioner CPD events

Develop your skills, knowledge and career with our bespoke practitioner CPD events.


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Food demo days

Develop knowledge, grow understanding and build skills with our informative ION Food Events.


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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...


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Optimum Nutrition Clinic

If you are feeling unwell (or simply want to improve your sense of wellbeing) and have an interest in finding out what you can do to support your health naturally, we’d recommend working one-to-one with one of our nutritional therapists in our Optimum Nutrition Clinic.




Latest articles and recipes

  • Wild rice and sweet potato salad

    This is such a delicious alternative to potato salad, and is great for packing into summery picnics or tossing into lunchboxes for a nutrient boost at lunchtime Read more

  • Five Minutes with | Belinda Blake

    We talk to Belinda Blake, registered nutritional therapist, workshop leader, foodie and forager Read more

  • Strawberries could help alleviate IBD symptoms

    Eating strawberries could help alleviate the symptoms of inflammatory bowel disease (IBD) – at least in mice; that’s according to researchers at the University of Massachusetts Amherst, USA. Read more