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A healthy diet, fresh air, sunlight and regular exercise are necessary for a healthy immune system.


Health deterioration during  Winter due to reduced sunlight is considered in the section on 'Winter Blues'. 

Vitamin D supplements strengthen the immune system and if you take just one supplement, this is it. Vitamin D3 High Strength tablets (5000 i.u.) are available from Nutri Advanced, TEL: 0800 043 5777.

For people with suboptimal health, comprehensive immune system optimisation under vegatest control can be undertaken at this clinic.  

Although 5000 i.u. of vitamin daily is an above average dose, recent research supports taking much higher doses for acute viral infections - see below.

 Evidence that Vitamin D Supplementation Could Reduce Risk of Influenza and COVID-19 Infections and Deaths

Dr. Thornburg described that an adult should treat a cold/flu within 24 to 36 hours after onset with 50,000 IU of vitamin D3 once daily for 3 days (that’s a total of 150,000 IU over three days). He also lists pediatric doses. Following this treatment the patient resumes the previous vitamin D3 maintenance dose.

Dr Bourne takes 10,000 units of vitamin D3 daily during Winter.



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