A powder sachet rather than a capsule, and one that does not need water. You tip it straight into your mouth, which makes it unusually easy to keep up away from home.

The formulation is Cerebiome, a researched two-strain combination: Lactobacillus helveticus at 2.682 billion CFU and Bifidobacterium longum at 0.318 billion CFU, three billion between them per sachet. The only other ingredient is xylitol at 750mg.

It also does not need refrigeration, which is the practical difference between a probiotic you finish and one that sits in the fridge door.

Adults and children 3 and over: empty one sachet into the mouth, any time of day.

Ten sachets, so a ten day run or a fortnight of most days.