Founder John Barton said the Chinese factory where the crisps were made had "countless capacity" to meet increased demand for the innovative crisps, which were listed in 147 Asdas in October.
Because the fruit slices are freeze-dried rather than dried using hot air like standard fruit crisps O! So Natural crisps retained more flavour when rehydrated in the mouth, said Barton.
An Asda buyer added: "We are very happy with the sales being achieved by O! So Natural in a very competitive snack market."
The crisps are available in strawberry, banana and apple variants (rsp: £1.98 per 5-pack).Barton said the fruit came from sustainable sources in China.