Does creatine affect blood pressure? What the research does and doesn't show

The evidence doesn't support the idea that creatine, at typical doses, meaningfully changes blood pressure in either direction. The two small trials that measured it, both in older adults, found no statistically significant change — one showed a trend toward a lower number on one side that didn't reach significance, and one didn't measure blood pressure at all.

What the evidence doesn't support

It doesn't support a claim that creatine raises blood pressure, and it doesn't support a claim that it meaningfully changes blood pressure in a beneficial direction either. Both come up in searches — some people worry creatine causes a spike, others have seen claims it helps circulation — and neither is backed by a trial built to answer the question. What exists is two small studies that measured related things, in older adults, for a short time.

What the trials found

A randomized trial gave men aged 55-80 either 20 g/day of creatine, a placebo, or nothing, for 7 days, and measured vascular stiffness and cardiac function. One measure of arterial stiffness (the cardio-ankle vascular index) changed significantly in the creatine group. On one side of the body, systolic pressure moved from an average of 144.0 to 136.1 mmHg in the creatine group — a shift that did not reach statistical significance (p=0.08) — with no change in the placebo or untreated groups. Stroke volume, heart contractility and ejection fraction showed no difference between any of the three groups. One limitation worth naming: the placebo group in this trial was on average about 10 years older than the creatine and control groups at the start, which the researchers don't fully account for in their comparison.

A separate 4-week crossover pilot in 12 sedentary, healthy older adults compared creatine to placebo and measured several markers of blood vessel function directly — flow-mediated dilation (a measure of how well an artery widens) and microvascular reperfusion rate both moved in a favorable direction with creatine, alongside a drop in fasting glucose and triglycerides. This trial didn't report a blood pressure number as one of its outcomes, so it can't be used to answer the blood pressure question directly, even though it's often cited alongside it.

Neither trial was built with blood pressure as its main outcome, both were small (12 and 36 people), and both were short (7 and 28 days). Neither recruited people who already have high blood pressure, so there's nothing here that speaks to what creatine does in that specific group.

Questions people ask

Does creatine increase blood pressure?

The trial that measured it found the opposite direction of trend — a small, statistically nonsignificant move toward a lower reading on one side, in older men over 7 days. Nothing in the current research supports a claim that creatine raises blood pressure.

Can creatine raise blood pressure?

No trial to date has reported creatine raising blood pressure. The evidence is thin either way: two small, short studies in older adults, neither designed specifically to answer this question.

Does creatine cause high blood pressure?

Nothing in the available research shows that. The one trial that measured a blood pressure number found a nonsignificant trend in the other direction.

Can I take creatine with high blood pressure?

No trial has tested creatine specifically in people who already have high blood pressure, so there's no research-backed dose or outcome to point to for that group. If you take blood pressure medication, ask your doctor before adding any new supplement, since that's a conversation about your specific prescriptions, not something this page can answer.

Does creatine with high blood pressure change anything about how it's taken?

We didn't find a trial that adjusted dosing for people with elevated blood pressure. That's a question for a doctor familiar with your situation, not something the general research answers.

When to talk to a doctor

If you have diagnosed high blood pressure, or take medication for it, talk to your doctor before starting creatine or any new supplement — not because the research shows a specific danger, but because the research on this exact combination barely exists. Creatine is not a treatment for high blood pressure, and nothing above should be read as a reason to add or drop a blood pressure medication on your own.

Related reading: creatine and heart disease: what the research does and doesn't show, creatine side effects, and who should not take creatine.