“Optimum nutrition is the medicine of tomorrow.”

Professor Linus Pauling, PhD, Nobel laureate

The Institute for Optimum Nutrition (ION) is a higher education institution founded in 1984 by Patrick Holford with the support of twice Nobel Prize winner Professor Linus Pauling. It is one of the most respected training bodies of its kind in Europe. 

Our flagship Nutritional Therapy 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 and magazine Optimum Nutrition support the public to make a positive impact on their lives with food.

Courses and services

Study nutritional therapy

ION courses are designed with flexibility in mind and provide outstanding support. There are courses for everyone: from people with no previous experience, to qualified nutritional therapists, to doctors, allied healthcare professionals and CAM practitioners ready to add personalised nutrition to their practice. As one of the most respected training bodies of its kind in Europe, find out about studying at ION.

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Short courses / CPD

Discover exciting opportunities to deepen your knowledge and support your professional development through a range of short nutrition courses, short health courses, practitioner CPD events and Food Demo Days.

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Open events

Register for an open event, join us online for a webinar (our in person open events are currently on hold) or book a one-to-one appointment phone call.

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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.

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Online webinars

  • CPD on-demand | Applying the latest nutrition evidence for people living with and beyond cancer

    This is a recording of a live course. It will help practitioners develop personalised nutrition plans for their clients living with and beyond cancer based on available evidence. Read more

  • CPD on-demand | Hashimoto’s Autoimmune Thyroiditis

    This is a recording of a live course. It reviews the pathophysiology and underlying causes of autoimmune thyroid dysfunction and explains the body-wide impact of thyroid antibodies on non-thyroid tissue. It provides an approach for staging clients and intervening with diet and supplementation and explains the strength of the evidence in these areas. Read more

  • CPD on-demand | 2 day course - Women’s Health and the HPA and HPG axes

    This is a recording of a live course. The course aims to enable practitioners to more confidently identify and and address symptoms related to HPA and HPG dysregulation. Read more

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