
The drink, which contains 50% juice including strawberry, raspberry and blackcurrant, adds to the existing variants Relentless Origin, Relentless Juiced Energy Tropical and Relentless Inferno.
Coca-Cola is looking to capitalise on the growth of the brand which since its launch in 2006 reached sales worth £40m for the 52 weeks ending 17 January, according to AC Nielsen.
Relentless Juiced Energy Berr will be available in 12 x 500ml cases.