The Number One Choice For 13,000+ Athletes

Crush Your Cardio Like a Pro

Created for Athletes to Push the Pace—Without the Chaotic Breathing, Slow Recovery, or Lagging Paces

Supports Better Heart Function:

Improves athletic performance naturally

Boosts Endurance and Stamina:

Enhances blood flow, oxygen delivery, and heart efficiency

Increases VO2 Max:

Maximizes oxygen efficiency for peak cardiovascular health

Five Reasons Your Pre-Workout Is Ruining Your Cardio Performance

It's Loaded with Stimulants

Most pre-workouts rely on heavy doses of caffeine to provide energy, but that quick jolt can leave your heart racing and your endurance crashing. 



Cardio demands sustained energy, not jittery bursts.

REASON 1

No Focus on Blood Flow

If your pre-workout isn't supporting blood flow with ingredients like beetroot or Arjuna, it's failing to deliver the oxygen your muscles need to keep going. 

Without proper circulation, your cardio performance suffers.

REASON 2

It's All About Pumps, Not Performance

Many pre-workouts are designed for muscle pumps and appearance, neglecting what matters most in cardio: pacing, recovery, and stamina.

To perform your best, you need a formula tailored for endurance.

REASON 3

Recovery Is an Afterthought

Long cardio sessions and interval training push your body to its limits.

Without ingredients like Ashwagandha to reduce stress and speed recovery, fatigue builds, and performance plateaus.

REASON 4

Artificial Junk Slows You Down

Fillers, artificial flavors, and untested chemicals aren't just unhealthy—they can weigh you down and hold you back. 

Clean, all-natural support is essential for reaching your peak cardio potential

REASON 5

Why We Created FLOW

Most pre-workouts focus on pumps and stimulants. FLOW is different. We built it specifically for the cardiovascular system, supporting oxygen delivery and sustained performance when you need it most.

The Science Behind FLOW 5 Natural Performance Boosters

  • Supports healthy blood flow
  • Enhances oxygen delivery
  • Promotes cardiovascular health
  • Backed by clinical research

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What Athletes Are Saying…

Met Nick Williams and he raved about this product for breathing better during my training. Recently got back into the gym and gave the product a try. I immediately saw a difference in my breathing and endurance through the workout. My reps got easier where before I struggled on 8, 9, and 10. I highly recommend this to anyone who is getting into the gym or coming back after not working out for a while. Great way to perform better while still using ingredients that are good for your body.

I want to thank Nick for the intro to this brand and want to thank the Cerus owners for coming up with such a wonderful product!

Aaron W.Verified Customer

Flow and Flow Pro are an essential in my gym bag now. Liberally! My bottle stays there so it always ready for me in training. This isn't a supplement you necessarily feel kick in, but it is like that sneaky ninja that kicks you into overdrive. But you won't realize it till you're in the midst of your workout. It's a subtle shift into overdrive. No jitters, no pins and needles, no palpatations. Just flowin through your workout with the ease of a cheetah on the hunt.

Amber B.Verified Customer

I first learned about Cerus on social media, I tried their Flow Pro and I have to say I am a true fan on it. It works like it should and there is no crash. Definitely got me through some tough workouts and basketball sessions and helps me get through my day at my day job, as a Baggage Handling Agent. There are no jitters or anything else that usually is a result of taking this pre workout. It works, you will notice it when you are doing something strenuous, you'll get through your workouts with no issues.

Damon H.Verified Customer

Love this product especially on conditioning days when I know I need to push my aerobic capacity and it gets the job done. Definitely feel the difference when on it versus not the beetroot extract and Arjuna bark really do help open up those pulmonary pathways!

Jimmy G.Verified Customer

I live and train at high altitude and I've had some lung challenges when exercising. I tried FLOW and saw a big difference immediately! I can train longer and harder without being out of breath...love it!

Tami F.Verified Customer