Most gut supplements add bacteria and hope they take. This one takes a different route: rather than supplying organisms, it supplies the thing beneficial bacteria produce.

Butyrate is a short-chain fatty acid made in the colon when gut bacteria ferment fibre. It is the main fuel for the cells lining the colon wall. The catch is that how much you make depends on what is already living in your gut, which is exactly what is uncertain in the people most interested in a gut supplement.

Bettergut uses ButyraGen at 200mg per capsule, providing 100mg of tributyrin, a form that carries butyrate intact through the stomach rather than releasing it too early.

Adults and children 12 and over: one capsule daily, with or without food. Thirty vegetable capsules.