Several common supplements can raise blood pressure, some dramatically. Stimulant-based supplements like yohimbine and ephedra are the most well-documented offenders, but hidden sodium in fizzy vitamin tablets, high-dose potassium pills, licorice extract, and even ginseng can push your numbers up. Knowing which ones carry risk helps you avoid an unwelcome surprise at your next checkup.
Yohimbine and Ephedra: The Biggest Offenders
Yohimbine, sold as a fat-burning and sexual performance supplement, causes dose-dependent spikes in blood pressure. Research published through the American Heart Association found that at its highest tested dose, yohimbine raised systolic pressure by an average of 28 mmHg and diastolic by 8 mmHg. That’s enough to push someone from a normal reading into a hypertensive range in a single dose. The effect comes from blocking a receptor that normally keeps blood vessels relaxed, essentially removing a brake on your cardiovascular system.
Ephedra (also labeled as Ma Huang) works through a different mechanism, directly stimulating the nervous system to constrict blood vessels and speed up heart rate. It was banned from U.S. dietary supplements in 2004 but still appears in products imported from overseas or sold through unregulated channels. The 2025 joint guideline from the American Heart Association and American College of Cardiology lists both yohimbine and ephedra as supplements to avoid entirely if you have or are at risk for high blood pressure.
Pre-Workout and Energy Supplements
Pre-workout powders and energy-boosting supplements often contain stimulants that can raise blood pressure, though the risk depends heavily on the specific ingredients. The problem is that labels don’t always make it easy to identify what’s inside. Stimulant compounds frequently appear under obscure names. Octodrine, for instance, may be listed as DMHA, 1,5-dimethylhexylamine, 2-aminoisoheptane, or 2-amino-6-methylheptane, all the same compound. Unless you recognize these aliases, you could be taking a potent stimulant without realizing it.
Caffeine itself, whether from synthetic sources or natural ones like guarana, is well established as a short-term blood pressure elevator. However, the effect varies widely between individuals. One clinical study testing an herbal caffeine-containing supplement found no significant changes in blood pressure or heart rate, even among participants who already had high readings. Habitual caffeine users tend to develop tolerance. The real concern is with supplements that stack caffeine alongside other stimulants, amplifying the cardiovascular effect beyond what caffeine alone would produce.
Black Licorice Extract
Licorice root extract, found in digestive supplements and some herbal blends, raises blood pressure through a mechanism completely different from stimulants. It contains a compound that blocks an enzyme responsible for deactivating cortisol in the kidneys. When cortisol accumulates there, it mimics a hormone that tells your body to retain sodium and excrete potassium. The result is increased fluid volume and higher blood pressure. The 2025 AHA/ACC guideline places black licorice in the same “avoid use” category as ephedra and yohimbine. Even small amounts taken regularly can be enough to cause measurable increases.
Ginseng at High Doses
Panax ginseng has a complicated relationship with blood pressure. At moderate doses, some studies suggest it may have a neutral or even mildly lowering effect. But high doses or prolonged use are associated with hypertension and blood pressure instability. The American Academy of Family Physicians lists high blood pressure as both a potential side effect and a contraindication for ginseng use. If you already have elevated readings, ginseng supplements add unpredictability to your numbers, which makes managing your blood pressure harder even if the average effect is small.
Hidden Sodium in Effervescent Supplements
This one catches people off guard. Effervescent (fizzy, dissolvable) vitamin and mineral tablets can contain enormous amounts of sodium. A single effervescent paracetamol tablet, for example, can contain nearly 430 mg of sodium. Take the maximum daily dose of eight tablets, and you’ve consumed over 3,400 mg of sodium from that one product alone, well above the recommended daily limit of about 2,400 mg. Effervescent vitamin C, calcium, and multivitamin tablets use the same sodium-based formulations to create the fizzing reaction.
Sodium raises blood pressure by pulling water into your bloodstream, increasing the volume of fluid your heart has to pump. If you’re taking a daily fizzy supplement and wondering why your blood pressure crept up, check the sodium content on the label. Standard swallowable tablets and capsules of the same vitamins typically contain negligible sodium.
High-Dose Potassium Supplements
Potassium is generally considered blood-pressure-friendly. Replacing regular salt with potassium-enriched alternatives lowers systolic pressure by about 5 mmHg on average. But the relationship between supplemental potassium and blood pressure isn’t linear. According to the 2025 AHA/ACC guideline, the blood pressure benefit maxes out at roughly 30 mmol per day of supplemental potassium. Above 80 mmol per day, blood pressure actually starts to rise, particularly in people already taking blood pressure medication. The guideline recommends aiming for 3,500 to 5,000 mg of potassium daily, preferably from food rather than pills, and keeping supplemental doses moderate.
Bitter Orange (Synephrine): Lower Risk Than Expected
Bitter orange extract, which contains a stimulant called synephrine, is often flagged as a blood pressure concern because of its chemical similarity to ephedra. The actual clinical evidence is more reassuring. A 60-day placebo-controlled trial giving participants about 49 mg of synephrine twice daily found no significant changes in systolic or diastolic blood pressure. Heart rate differences were limited to about 3 beats per minute in one combination group, a change the researchers considered clinically insignificant. That said, synephrine is frequently combined with caffeine or other stimulants in weight loss products, and those combinations haven’t been as thoroughly studied.
How to Check Your Own Supplements
If you’re monitoring your blood pressure and taking any supplements, a practical first step is to look at every label for stimulant ingredients, sodium content, and herbal extracts. Watch for the aliases: Ma Huang is ephedra, glycyrrhizin or glycyrrhiza is licorice, and any ingredient ending in “-amine” in a pre-workout product is likely a stimulant worth researching before you take it.
The supplements most consistently linked to blood pressure increases are yohimbine, ephedra and its derivatives, black licorice extract, and high-sodium effervescent formulations. Ginseng and high-dose potassium fall into a gray zone where the dose and duration determine whether they help or hurt. If your blood pressure has risen and you can’t explain why, your supplement shelf is a reasonable place to start looking.