Allex Patrick Holford (60). Patrick Holford Allex tablets provide are made up of a combination of nutrients that help to alleviate the symptoms experienced due to the presence of allergens such as pollen, while also boosting the body's defences in order to reduce sensitivities to allergens in the long run. The tablets are gluten free, milk free, yeast free, corn free and soya free.. Allex is made with the intolerant individual in mind and so is completely free from gluten, milk products, yeast, corn, soya or other common allergens. Vitamin C contributes to the normal function of the immune system and to the protection of cells from oxidative stress