Dark energy to fuel your body.
Endurance fuel for ultra runners, gravel degenerates, mountain bikers, and endurance weirdos who train like a metal show in the desert.
Join the early crewThe Formulas
GrimSurge
No caffeine · Daily training
~49g carbs · base salt
Warpath
~100mg caffeine · Race day
~49g carbs · base salt
Ultra
Protein · Long-haul efforts
~49g carbs · coming soon
Inferno
No caffeine · Summer / heat
~49g carbs · higher salt
Hellfire
~100mg caffeine · Summer race day
~49g carbs · higher salt
What is GrimSurge?
Small‑batch endurance fuel built for long runs, desert heat, night rides, and back‑to‑backs where "just a little tired" stopped being true hours ago.
Clean ingredients, honest performance, zero miracle claims. No pastel wellness vibe, no fake mindfulness—just dark energy to fuel your body.
Who it's for
If you'd rather suffer in the dark than smile for an energy‑gel ad, you're home. GrimSurge is for the unsponsored, the late‑night grinders, and the crews building their own races and stupid‑long challenges.
Get in early
Drop your email to hear when the first batches are ready, get early‑tester calls, and see what crawls out of the cave next.