Grenade Carb Killa Bar Chocolate Chip Salted Caramel - 60g. Carb Killa is a high protein, low sugar bar, triple layered and coated in chocolate for ultimate indulgence. The Grenade Protein Bar comes in plenty of delicious flavours and each one is packed full of protein! The tasty treat bar is ideal for those who go to the gym and keep fit as it's low in sugar and protein to help with the healthy building of muscle. This bar is ideal for before and after a workout.