Creatine vs Nitric Oxide Boosters: What's the Difference?

Creatine and "nitric oxide" pre-workout ingredients aren't versions of the same thing. Creatine raises muscle phosphocreatine stores, used for short bursts of high-intensity effort. Nitric oxide boosters — usually L-citrulline or L-arginine — aim to widen blood vessels and increase blood flow, often marketed for "pump." Their evidence bases are separate, and not equally strong.

What creatine does and what the research covers

Creatine's mechanism raises intramuscular phosphocreatine, which the body draws on to help regenerate ATP during short, high-intensity effort — a heavy lift, a sprint. The 2017 International Society of Sports Nutrition position stand summarizes that mechanism, and the research built on it is a large trial base centered on strength, power output and lean mass when creatine is paired with resistance training. The full breakdown, including where the evidence is weaker (older adults, women, general cognition), is in creatine benefits: what the research does and doesn't show.

What "nitric oxide boosters" actually are, and what their research shows

Products marketed around "nitric oxide" usually contain L-citrulline, L-arginine, or citrulline malate — amino acids the body can convert toward nitric oxide, a molecule involved in widening blood vessels. The strength evidence specifically doesn't hold up as well as creatine's: a 2021 meta-analysis of 4 randomized trials found citrulline malate supplementation produced no significant overall improvement in muscle strength in resistance-trained adults, on either upper- or lower-body measures. A separate 2020 meta-analysis of 13 trials (206 participants) found a different, narrower benefit: citrulline supplementation significantly reduced perceived exertion and muscle soreness in the first two days after exercise, without a significant effect on blood lactate. Together, that's evidence for feeling less taxed by a workout, not for lifting more weight.

Comparing the two evidence bases

Creatine's strength and power research draws on a much larger number of trials and participants, with statistically significant findings across several specific lift and power measures. Citrulline's strength-specific research is smaller (4 trials) and found no significant benefit; its better-supported finding is a reduction in how hard exercise feels afterward, a different outcome than strength or power output. Neither ingredient's research shows it doing what the other is actually studied for — creatine's trials don't measure blood flow or "pump," and citrulline's trials don't show the strength gains creatine's trials do.

	Creatine	Nitric oxide boosters (citrulline)
Mechanism	Raises phosphocreatine for ATP regeneration	Precursor toward nitric oxide, widens blood vessels
Strength/power evidence	Large trial base, significant on several measures	4-trial meta-analysis, no significant effect
Best-supported finding	Strength, power, lean mass with resistance training	Reduced perceived exertion and soreness (not lactate)

Can you take both?

There's no documented conflict between creatine and a citrulline-based product; they work through unrelated pathways. A combination formula containing both doesn't automatically mean either ingredient is present at a dose that matches its own research — check the milligram amount for each, not just the ingredient name on the front of the label. See how to choose a good creatine for the checklist on our creatine specifically.

Our creatine monohydrate

Electric Tiger Creatine Monohydrate is 5,000 mg of creatine monohydrate per scoop, nothing else in the tub, 50 servings, as low as $20.63 a bottle on subscription. We don't sell a nitric-oxide or citrulline product, so this page doesn't compare specific products — just what each ingredient's own research shows.

Questions people ask

Should I take creatine or a nitric oxide booster?

They're studied for different things: creatine for strength and power with resistance training, citrulline for reduced perceived exertion and soreness. Which matters more depends on which outcome you're after — the strength research favors creatine specifically.

Does creatine increase nitric oxide?

Creatine's studied mechanism is the phosphocreatine energy system, not nitric oxide production. We didn't find a trial establishing a meaningful nitric oxide effect from creatine itself.

Is a "pump" the same as a strength gain?

No. A pump refers to blood flow and vessel dilation during a workout; the strength-outcome research above measured maximal lifts and power output, which is a separate physiological outcome that citrulline's own trial base didn't significantly improve.