Monday has become so popular in NZ and Australia the brand says supermarkets are struggling to keep up, though Lupton was last week forced to defend criticism that silicone was damaging customers' hair.
Mowbray told Spy that small businesses were the backbone of Kiwi entrepreneurship and Libby was the embodiment of that.
"We saw a unique opportunity to launch Dose & Co worldwide in what is one of the world's fastest-growing categories - and have major plans ahead for it."
Libby, who is soon to have her second child, has been watching the growth of her brand in NZ and Australia and hopes the partnership will help send Dose & Co international.
"I live in Minnesota and it makes me so happy to know I will soon see Dose & Co on shelves here," she says.
Meanwhile, Julia's wellness company, Two Islands, is going from strength to strength and last week she gave birth to baby boy Lenny with partner Cameron Logan.