The apple cider vinegar hype: where it comes from
Apple cider vinegar has become a wellness trend staple, promoted for everything from weight loss to blood sugar control to heart health. The blood pressure claims stem from a mix of animal research, a handful of small human trials, and a 2022 meta-analysis that pooled data from randomized controlled trials on vinegar consumption.
That meta-analysis, published by Shahinfar and colleagues in Complementary Therapies in Medicine, found that each 30 ml per day increase in vinegar consumption was associated with a 3.25 mmHg reduction in systolic blood pressure. For context, that is smaller than the effect of cutting sodium intake by half or adding 150 minutes of moderate exercise per week, both of which typically lower systolic pressure by 5-8 mmHg.
The problem? The meta-analysis itself rated the evidence quality as low. Most included studies were short-term, small, and had methodological issues. Some well-designed human trials showed no blood pressure effect at all.
A 2026 umbrella review by Shahmohammadi and colleagues in Food Science & Nutrition, which pooled the results of earlier meta-analyses, found a similar systolic drop of about 2.94 mmHg and rated that finding high certainty. It found no clear effect on diastolic pressure, so for blood pressure the overall picture is a small drop in the top number and no clear change in the bottom one.
What the research actually shows
Animal studies (promising but not human proof)
Multiple studies in rats with high blood pressure have shown that acetic acid (the active ingredient in vinegar) significantly lowers blood pressure. A 2001 study in Bioscience, Biotechnology, and Biochemistry (Kondo and colleagues) found that acetic acid lowered systolic pressure in spontaneously hypertensive rats, with the proposed mechanism being reduced renin activity and subsequent decreases in angiotensin II (a hormone that constricts blood vessels).
A study by Na and colleagues, published online in 2015 in the European Journal of Nutrition, found that vinegar and acetic acid lowered blood pressure in the same strain of rats, switched on AMPK (an enzyme that acts as an energy sensor inside cells) and reduced the number of receptors for angiotensin II. Again, this was in rats.
Animal models are useful for understanding biological mechanisms, but they do not guarantee the same effects will occur in humans at typical dietary doses.
Human trials (small and mixed results)
Human evidence is far less impressive. In a 2023 randomized controlled trial published in Frontiers in Clinical Diabetes and Healthcare (Jafarirad and colleagues), 73 adults with type 2 diabetes completed eight weeks of either 30 ml of apple cider vinegar a day or no vinegar, and both groups had the same healthy-eating advice. Systolic pressure fell by about 5.7 mmHg in the vinegar group and by about 1.9 mmHg in the other group, but the difference between the groups was not statistically significant, and diastolic pressure barely changed.
A 2019 trial by Gheflati and colleagues in Clinical Nutrition ESPEN randomly assigned 70 people with type 2 diabetes and raised blood fats to 20 ml of apple vinegar a day or to a control group for eight weeks. It found no clear effect on blood pressure, although fasting blood sugar improved.
On the other hand, when the 2022 meta-analysis combined the trials, it found a small drop that grew with the dose, up to about 30 ml a day. The issue is publication bias (studies showing no effect are less likely to be published) and heterogeneity in study design.
| Study Type | Finding | Evidence Quality |
|---|---|---|
| Rat studies | Acetic acid significantly lowers BP via renin/angiotensin pathway | Animal data; not directly applicable to humans |
| Meta-analysis (2022) | 30 ml/day vinegar = ~3.25 mmHg systolic reduction | Low quality; small studies, short duration, high variability |
| Umbrella review (2026) | About 2.94 mmHg lower systolic; no clear change in diastolic | High certainty for systolic, moderate for diastolic (GRADE) |
| RCT in diabetics (2023) | Systolic fell 5.7 vs 1.9 mmHg over 8 weeks; the gap was not statistically significant | Moderate quality; small sample |
| RCT in T2D patients (2019) | No effect on BP; improved glucose control | Moderate quality |
How apple cider vinegar might affect blood pressure
The proposed mechanisms are biologically plausible but not definitively proven in humans:
- Acetic acid and the renin-angiotensin system: Acetic acid may reduce renin activity, lowering production of angiotensin II, a potent vasoconstrictor. This would relax blood vessels and reduce pressure.
- AMPK pathway activation: Acetic acid activates AMP-activated protein kinase, a metabolic regulator that improves endothelial function and promotes nitric oxide production, both of which help blood vessels dilate.
- Potassium content: Apple cider vinegar contains a small amount of potassium (around 11 mg per tablespoon). Higher potassium intake is associated with lower blood pressure, but the amount in ACV is minimal compared to potassium-rich foods like bananas, potatoes, or leafy greens.
- Anti-inflammatory effects: Some studies suggest vinegar reduces markers of chronic inflammation, which is linked to endothelial dysfunction and hypertension.
- Blood sugar and weight effects: If ACV improves insulin sensitivity or aids modest weight loss (both have weak evidence), those secondary effects could indirectly lower blood pressure.
None of these mechanisms have been conclusively demonstrated in well-controlled human trials at the doses people typically consume.
Realistic expectations: what ACV probably will not do
Apple cider vinegar is not a substitute for proven interventions
ACV will not lower your blood pressure immediately. If your reading is suddenly very high, read what to do about a sudden spike in blood pressure. If your blood pressure is higher than 180/120 and you have symptoms such as chest pain, shortness of breath or a change in vision, that is a hypertensive emergency. Do not reach for a bottle of vinegar. Call emergency services straight away.
ACV is also not a magic bullet for weight loss or cholesterol, despite internet claims. The evidence for those effects is similarly weak and inconsistent.
Which medications does apple cider vinegar interfere with?
The medicines to check first are water pills (diuretics), digoxin, and insulin or other diabetes medicines. Water pills can lower your potassium, low potassium makes digoxin more likely to cause harmful side effects, and very large amounts of vinegar have been linked to low potassium. Vinegar can also lower blood sugar after a meal, which could add to the effect of diabetes medicines.
If you take medication, especially for blood pressure or diabetes, talk to your doctor before adding apple cider vinegar to your routine. Key interactions include:
| Medication Type | Interaction Risk | Why It Matters |
|---|---|---|
| Diuretics (water pills) | Can lower potassium excessively | Water pills can lower potassium, and very large amounts of ACV have been linked to low potassium in a case report; low potassium can cause an irregular heartbeat |
| Digoxin | Potassium depletion increases toxicity risk | Low potassium makes digoxin more dangerous; close monitoring required |
| Insulin and diabetes drugs | May enhance blood sugar-lowering effect | Risk of hypoglycemia if not monitored; dosage adjustments may be needed |
| ACE inhibitors and ARBs | Unclear, theoretical interaction | Both ACV and these drugs affect the renin-angiotensin system; effects could theoretically be additive or unpredictable. Combination tablets with hydrochlorothiazide also contain a water pill. |
| Other blood pressure medicines (amlodipine, metoprolol) | Theoretical: a small extra drop in pressure | None of the sources cited here describe a direct interaction. Check your home readings for a few weeks after you start. |
Grapefruit is a well-known example of a food that changes how some blood pressure medicines work, and our guide to grapefruit and blood pressure medication explains which ones.
Excessive apple cider vinegar consumption (more than 2 tablespoons per day regularly, or undiluted consumption) can also cause:
- Tooth enamel erosion from acidity
- Throat irritation or esophageal burns (if undiluted)
- Nausea or stomach upset
- Worsening of acid reflux or GERD
- Low potassium levels (hypokalemia), especially in combination with diuretics. Apple cider vinegar is sometimes called a natural diuretic. The 1998 case report of low potassium involved very large amounts: a woman had drunk about 250 ml (roughly a cup) a day for six years. A splash in a salad dressing is far below that.
Is it safe to take apple cider vinegar with amlodipine?
Ask your doctor or pharmacist first, although none of the sources cited in this article describe a direct interaction between the two. Amlodipine lowers blood pressure by relaxing blood vessels, and vinegar may lower it by a few more points, so watch for dizziness or light-headedness and check your readings at home for a few weeks.
Can I take apple cider vinegar with lisinopril or losartan?
Ask your doctor first. Lisinopril (an ACE inhibitor) and losartan (an angiotensin receptor blocker, or ARB) act on the renin-angiotensin system, the same hormone system that acetic acid affected in the rat studies above, so any interaction is theoretical. Both medicines can raise the level of potassium in your blood, and their US prescribing information warns about high potassium, so the low-potassium concern above applies mainly to water pills. Some tablets combine lisinopril or losartan with hydrochlorothiazide, which is a water pill, so check the full name on your prescription.
How to use apple cider vinegar (if you decide to try it)
If you want to experiment with apple cider vinegar as a complementary strategy alongside proven blood pressure interventions, here is how to do it safely:
- Dosage: 1-2 tablespoons (15-30 ml) per day. Start with 1 tablespoon to assess tolerance.
- Dilution: Always dilute in a large glass of water (at least 8 oz). Never drink undiluted vinegar.
- Timing: Some people take it before meals for potential blood sugar benefits. There is no strong evidence that timing matters for blood pressure.
- Type: Look for raw, unfiltered apple cider vinegar with the "mother" (the cloudy sediment containing acetic acid bacteria and enzymes). Brands like Bragg are widely available.
- Rinse your mouth: After consuming, rinse with plain water to protect tooth enamel from acid exposure.
- Monitor your blood pressure: If you try ACV, track your readings consistently using a blood pressure tracker. This lets you see if it makes any measurable difference for you personally.
How to test apple cider vinegar on your own blood pressure
The only way to know whether vinegar does anything for you is to measure before and after. Take two readings a minute apart each morning and evening for two weeks before you start, sitting quietly for five minutes first as the National Heart, Lung, and Blood Institute advises, and log them. Then keep the same routine for four to six weeks while you take the vinegar, and compare the two averages. Blood pressure naturally goes up and down through the day, and the average drop in trials was only about 3 mmHg, so a small difference between your two averages may just be chance. Treat it as “no clear effect”, and share the log with your doctor if you take blood pressure medicine.
Better-supported alternatives to apple cider vinegar
If you are looking for evidence-based ways to lower blood pressure naturally, these strategies lower blood pressure by as much as ACV or more, and most have been tested in larger and longer trials:
| Strategy | Expected BP Reduction (Systolic) | Evidence Quality |
|---|---|---|
| DASH diet (high potassium, low sodium, plant-focused) | -8 to -14 mmHg | Very high (multiple large RCTs) |
| Aerobic exercise (150 min/week moderate activity) | -5 to -8 mmHg | Very high |
| Sodium restriction (reduce to <2,300 mg/day) | -5 to -6 mmHg | Very high |
| Weight loss (if overweight) | -1 mmHg per kg lost | High |
| Magnesium supplementation (300-400 mg/day) | -3 to -5 mmHg | Moderate to high |
| Potassium-rich foods (4,700 mg/day) | -4 to -5 mmHg | High |
| Apple cider vinegar (30 ml/day) | About -3 mmHg | Low (2022 review) to high (2026 review) |
Notice that ACV has one of the smallest effects in the table. If you have not yet optimized your diet, exercise, and sodium intake, those are far better places to invest your energy.
Foods that actually lower blood pressure
Instead of focusing on vinegar, consider incorporating more of these evidence-backed foods into your diet:
- Leafy greens (spinach, kale, Swiss chard) for potassium and nitrates
- Berries (blueberries, strawberries) for flavonoids that improve vascular function
- Beets and beet juice for nitric oxide production
- Fatty fish (salmon, mackerel) for omega-3 fatty acids
- Oats and whole grains for soluble fiber
- Nuts and seeds (almonds, flaxseeds) for magnesium and healthy fats
- Low-fat dairy for calcium and potassium
Together, these foods make up much of the DASH eating pattern, which lowered systolic pressure by far more than vinegar in large trials.
The bottom line on apple cider vinegar and blood pressure
Apple cider vinegar may lower systolic blood pressure by about 3 mmHg if used consistently. The 2022 review rated that evidence low certainty, and the 2026 umbrella review rated its systolic finding high certainty. The proposed mechanisms (acetic acid affecting renin, AMPK activation, modest potassium content) are plausible but not proven in robust human trials.
If you want to try it, use 1-2 tablespoons diluted in water daily, and talk to your doctor first if you take blood pressure medication, diuretics, or have kidney issues. Track your blood pressure to see if it makes any measurable difference for you.
But do not use ACV as a substitute for proven strategies. Prioritize the DASH diet, regular exercise, sodium reduction, and prescribed medications. Those interventions have decades of high-quality evidence showing meaningful blood pressure reductions. Apple cider vinegar, at best, is a minor addition to a comprehensive plan, not a primary tool.
