Supplements to Avoid If You Have High Blood Pressure
Quick Answer
A handful of common supplements and herbs can directly raise blood pressure. Licorice root, bitter orange, yohimbine, ephedra, and high-dose caffeine or guarana are the best-documented. A separate group doesn't raise blood pressure on its own but interacts dangerously with blood pressure medication, most notably potassium supplements with ACE inhibitors or ARBs, and St. John's Wort with several drug classes. Everyday over-the-counter decongestants and NSAIDs deserve the same caution, even though they're not technically supplements. The safest approach is checking before you buy, not after a reading spikes.
Why "natural" doesn't automatically mean "safe" here
One of the most common blind spots isn't people ignoring their health. It's assuming that because something came from a health food store instead of a pharmacy, it can't meaningfully affect their blood pressure or their medication. That assumption causes real problems.
Plant-derived doesn't mean pharmacologically inactive. Some of the compounds below are potent enough to raise blood pressure on their own, and others can interfere with how well a prescribed medication does its job, sometimes without any obvious warning sign until a reading comes back unexpectedly high.
Supplements and herbs that can raise blood pressure directly
These are the ingredients with the strongest documented evidence for raising blood pressure, sometimes significantly, sometimes quickly:
| Ingredient | Why it's a concern |
|---|---|
| Licorice root | Causes the body to retain sodium and water while losing potassium, which can meaningfully raise blood pressure with regular use, including in candy and tea, not just capsules |
| Bitter orange (synephrine) | A stimulant chemically similar to ephedrine, commonly found in weight-loss products; raises blood pressure and heart rate |
| Yohimbine | Marketed for libido and fat loss; raises blood pressure and heart rate and can interact with several medication classes |
| Ephedra (ma huang) | Banned from US dietary supplements in 2004 due to cardiovascular risk, but still turns up in some imported products or blends under other names |
| High-dose caffeine / guarana | Can cause an acute, temporary spike in blood pressure, particularly in people who aren't regular caffeine users or who take large doses in energy or pre-workout products |
Supplements that interact dangerously with blood pressure medication
These don't necessarily raise blood pressure by themselves, but they can interfere with how well your prescribed medication works, or create a different kind of risk entirely:
| Supplement | The interaction |
|---|---|
| Potassium supplements | Dangerous when combined with ACE inhibitors, ARBs, or potassium-sparing diuretics, since these medications already raise potassium. Adding more risks hyperkalemia, which can cause serious heart rhythm problems |
| St. John's Wort | Speeds up how the liver processes certain medications, including some calcium channel blockers, which can make them less effective at controlling blood pressure |
| NSAIDs (ibuprofen, naproxen) | Not an herbal supplement, but frequently overlooked: regular use can raise blood pressure and blunt the effectiveness of ACE inhibitors, ARBs, and diuretics |
| CoQ10 | Generally well-tolerated and sometimes used supportively for blood pressure, but can interact with blood-thinning medication. Worth a specific check if you take a blood thinner |
Hidden sources people don't think to check
Some of the riskiest exposures don't come from a bottle labeled "supplement" at all:
- Cold and sinus decongestants: oral products containing pseudoephedrine or phenylephrine constrict blood vessels and can raise blood pressure; check with a pharmacist before grabbing one off the shelf
- Pre-workout and energy powders: often combine caffeine, synephrine, and other stimulants in doses well above what a cup of coffee provides
- Herbal teas: licorice root tea in particular is easy to drink daily without registering it as a "supplement" at all
- Weight-loss products: a common category for stacking several of the ingredients above into one product
- Proprietary blends: some labels list a blend total without disclosing individual ingredient doses, making it impossible to know how much of a concerning ingredient you're actually getting
How to check a label before you buy
A few minutes with the Supplement Facts panel before purchase is worth far more than research after a concerning reading. Look specifically for the ingredients covered above, check whether doses are individually disclosed rather than hidden in a proprietary blend, and if anything is unclear, ask a pharmacist, they're an underused resource for exactly this kind of question and don't require an appointment.
The single most protective habit, though, isn't reading labels perfectly. It's telling your doctor and pharmacist about every supplement you take, every time, including the ones that feel too minor to mention, the daily tea, the occasional energy drink, the multivitamin from years ago. Interactions get caught in that conversation, not in the supplement aisle.
For the broader picture of how supplements and medication relate to each other generally, our guide on blood pressure supplements vs. medication covers where each one realistically fits.
What a safer, better-formulated approach looks like
None of this means every supplement is a risk, or that people managing blood pressure should avoid the category entirely. It means being selective, and a few practical markers tend to separate a more thoughtfully formulated product from a riskier one:
- Every ingredient and dose disclosed individually, no hidden proprietary blend
- Ingredients with actual published research behind them, rather than trend-driven additions
- No stimulants stacked in for an "energy" effect
- Manufactured in a GMP-certified facility
- Clear, non-diagnostic marketing language. No promises to cure, treat, or replace medication
Looking for a Transparently Formulated Option?
See our independent review of a multi-botanical cardiovascular support formula
Read Our Independent ReviewFrequently asked questions
What supplements can raise blood pressure?
Licorice root, bitter orange (synephrine), yohimbine, ephedra (banned in US supplements but still found in some imported products), and high-dose caffeine or guarana are the most well-documented supplements that can raise blood pressure, sometimes significantly and quickly.
Can I take potassium supplements with blood pressure medication?
Not without your doctor's guidance. Potassium supplements can be dangerous when combined with ACE inhibitors, ARBs, or potassium-sparing diuretics, because these medications already raise potassium levels, and adding more can lead to hyperkalemia, a condition that can cause dangerous heart rhythm problems.
Does licorice really affect blood pressure?
Yes. Compounds in licorice root cause the body to retain sodium and water while losing potassium, which can meaningfully raise blood pressure with regular use. This includes licorice candy, licorice tea, and licorice root extract in supplements, not just concentrated capsules.
Are decongestants safe with high blood pressure?
Oral decongestants containing pseudoephedrine or phenylephrine, common in cold and sinus medications, constrict blood vessels and can raise blood pressure. People with hypertension are generally advised to choose alternatives and check with a pharmacist before buying cold medicine.
Can St. John's Wort interact with blood pressure medication?
Yes, St. John's Wort can speed up how the liver breaks down certain medications, including some calcium channel blockers, which can make the medication less effective at controlling blood pressure. It also has significant interactions with many other common medications.
Do NSAIDs like ibuprofen affect blood pressure?
Yes. Regular use of NSAIDs such as ibuprofen and naproxen can raise blood pressure and reduce the effectiveness of several blood pressure medications, including ACE inhibitors, ARBs, and diuretics. Acetaminophen is generally considered a safer choice for pain relief for people with hypertension, but it's worth confirming with your doctor.
How do I know if a supplement is safe to take with high blood pressure?
Check the supplement facts panel for the ingredients covered here, avoid products with undisclosed proprietary blends, and tell your doctor or pharmacist about every supplement you take, including herbal teas. The safest approach is asking before buying, not researching after a reaction.