Kiwi sisters Julia and Libby Matthews were one of New Zealand's most popular partnerships in the wellness scene.

Now the siblings have split and are rivals on the supplement scene.

In 2012 the pair started their popular Julia and Libby blog — which led to their best-selling cookbook, Nourished, and a prominent social media presence as well as creating the health brand Two Islands.

They both dated sports stars; Julia for a time was with former Kiwis league star Lewis Brown and Libby is now married to Kiwi football ace Michael Boxall, who plays for US team Minnesota United in