Manuka Health MGO 550+ Manuka Honey , £58.99, from Ocado, has the highest level of the virus-fighting active ingredient.
Solgar Flavo Zinc Lozenges , £4.99, from solgaronline.co.uk. Sucking one lozenge a day might help support a healthy immune system.
A. Vogel Echinaforce , £9.15, from avogel.co.uk, uses fresh echinacea, with three times more active substances than the dried herb.
HealthAid Garlic Oil , £7.99, from victoriahealth.com. The suitable-for-vegetarians capsules contain allicin that has been treated to make it odourless.…
