CERUS^™ Flow PRO

Flow PRO is a stimulant-free, caffeine-free cardio pre-workout made from 100% organic herbal ingredients. Instead of relying on stimulants for a temporary "buzz," it targets the three systems that actually drive endurance performance — respiratory, cardiovascular, and central nervous. The result is deeper breathing, better pacing, sustained output, and zero mid-workout crash or jitters.

Flow PRO is built for runners, endurance athletes, lifters, ruckers, CrossFit-style athletes, and anyone doing cardio-heavy training where traditional caffeinated pre-workouts tend to fall apart. It's also a great fit for people who are sensitive to stimulants, train later in the day and don't want caffeine disrupting sleep, or just want clean energy without the crash.

[ST:] Flow PRO is powered by five clinically-backed organic herbs:

[LI:] Peppermint oil — supports bronchodilation and airway efficiency, helping with oxygen intake, CO₂ clearance, and breathing cadence.
[LI:] Arjuna bark ("Heart Bark") — the hero ingredient; supports stroke volume, VO₂ max, and cardiac efficiency without spiking heart rate or blood pressure.
[LI:] Beetroot — a natural nitric oxide booster that improves blood flow, oxygen delivery, and time to exhaustion.
[LI:] Cayenne — activates thermogenesis and circulation, supporting nutrient delivery and reducing post-workout soreness.
[LI:] Ashwagandha (and Rhodiola) — adaptogens that help regulate cortisol, manage stress, and delay fatigue without overstimulation.

The formula is the same family of cardio-focused, stimulant-free herbal ingredients — the difference is size. Flow PRO comes in a 4 oz container, while the standard Flow is 2 oz, making PRO the better value for daily trainers or athletes who go through pre-workout quickly. Both versions are 100% herbal, vegan-friendly, and Informed Sport certified.

Yes — Flow PRO is backed by a 30-day money-back guarantee, so if it's not the right fit, Cerus will make it right.