Evening primrose oil in capsule form, aimed at coat and skin rather than joints, which is what separates it from the cod liver oil sitting next to it on the same shelf. Johnson's set a minimum age on it, which most supplement packs do not bother with.

The composition is evening primrose oil. Johnson's describe it as a natural dietary supplement rich in essential fatty acids, and say it helps support a healthy coat and skin condition and alleviate dry and irritated skin and scurf. They set it for cats and dogs over twelve weeks of age. The pack holds 60 capsules, and their own listing carries a New Improved tag, so the formulation has been changed at some point from whatever preceded it.

* Composition: evening primrose oil * For cats and dogs over twelve weeks of age * Aimed at dry, irritated skin and scurf * 60 capsules * A complementary supplement, not a food

Rich in essential fatty acids is a claim with no number behind it. The active part of evening primrose oil is generally taken to be its gamma linolenic acid, and Johnson's publish no figure for it, no figure for total fatty acids and no analytical panel of any kind. That means you cannot compare this capsule with any other EPO product on content, only on capsule count and price. Skin that is dry, irritated and scurfy is also a symptom rather than a diagnosis, and it is worth finding out what is causing it before deciding an oil is the answer.

Who it's for: Cat and dog owners past the twelve week mark who have already ruled out the obvious causes of a poor coat and want to try a single-ingredient oil rather than a blend.