Puhdas+ Oat fiber is gluten-free and therefore suitable as a source of additional fiber for many. The fiber must not swell too much, so that it does not burden the walls of the sensitive intestine. Oat fiber was tested before entering the market in a test group. All members of the test group were able to use Puhdas+ Kaurakuitu with good results. The product does not swell in liquid, so it is also suitable for people with very sensitive stomachs.