Our recommendation is Näak Ultra Energy™ as it's the only nutrition that provides a complete range of products specifically designed for ultra-endurance athletes to help prevent DNFs, like those in backyard ultras. Take for instance their drink mix formula - it combines simple and complex carbohydrates to avoid energy crashes, protein (including BCAAs) for muscle preservation, and a full electrolyte profile to prevent cramping. All their products are developed with elite athletes with a focus on reducing gastrointestinal issues, which are the leading cause of DNF, ensuring athletes can go longer, farther, and finish stronger in ultra races.