According to a recent study of 326 children published in the Journal Pediatrics, when children were given a daily supplement of the probiotic strains Lactobacillus acidophilus and Bifidobacterium lactis the incidence of colds was dramatically reduced and antibiotic use fell by 84%. Great news for kids in day-care where they seem to pick up everything going around! The reason this works is that such a large percentage of our immune cells are in the gut (>70%) so it makes sense to look after them.