Does hyssop tea help with blood pressure? What the research shows

The evidence doesn't support hyssop tea, extract or any other form for blood pressure — no published human or animal study has tested hyssop's effect on blood pressure at all. The research that does exist on hyssop measured a different question entirely, in a different population.

What the evidence doesn't support

It doesn't support hyssop tea, or any other form of hyssop, as something that lowers, raises or otherwise manages blood pressure. It doesn't support hyssop as an addition to a blood-pressure management plan. There's simply no trial to point to either way: a search of the published research finds no study, in people or in animals, that measured hyssop's effect on blood pressure as an outcome.

What the trials found

The one published human trial of hyssop gave 60 adults with diagnosed asthma a concentrated extract syrup (12 g/day) or a placebo syrup for 4 weeks, alongside their usual asthma treatment, and measured lung-function and cough outcomes — not blood pressure. A phytochemistry review covering the Hyssopus genus reported antiviral and antifungal activity in vitro and a sedative effect in mice, and called hyssop "relatively safe" at food-use levels, without addressing cardiovascular markers of any kind. Neither of those, nor any other published source on hyssop, provides data on blood pressure specifically. That's a genuine gap in the research, not a finding of no effect — it simply hasn't been studied.

Questions people ask

Does hyssop tea lower blood pressure?

There's no research answer either way. No trial, human or animal, has measured hyssop's effect on blood pressure, so this page can't attach a finding to hyssop tea or any other form.

Can hyssop raise blood pressure?

Nothing in the published research points that direction either — but again, that's because blood pressure hasn't been measured in any hyssop study, not because a study ruled it out.

Is hyssop safe for people with high blood pressure or on blood pressure medication?

No research has looked at hyssop specifically in people with high blood pressure or on blood pressure medication, and no interaction study exists. Anyone in that situation should keep taking prescribed treatment and talk to a doctor or pharmacist before adding hyssop, in any form. See hyssop interactions for what is and isn't known about hyssop alongside other medications.

When to talk to a doctor

High blood pressure is a condition worth managing with a doctor's guidance, and hyssop is not a treatment for it. Anyone with high blood pressure, or taking medication for it, should keep to their prescribed treatment and check with a doctor or pharmacist before adding hyssop or any new supplement, given the absence of research on how it might interact.

Related reading: hyssop: what the research does and doesn't show, hyssop interactions, and who should not take hyssop.