Lower Blood Pressure Overnight With This Kitchen Scrap

Most people throw it away without a second thought.

It ends up in the trash, the compost pile, or the garbage disposal.

Yet scientists recently discovered that this overlooked kitchen scrap contains unusually high concentrations of a compound that helps lower blood pressure naturally.

In one study, people with elevated blood pressure watched their numbers go down within just 24 hours.

Not after months of dieting. Not after weeks of exercise.

Just one day.

In fact, researchers recorded a nearly 5-point drop in daytime blood pressure—more than double the reduction experts say can lower the risk of stroke and heart disease.

So what is this forgotten food scrap?

The mystery kitchen scrap is onion skin.

Not the onion itself. The papery outer layer most people peel off and throw away.

As it turns out, onion skins contain some of the highest concentrations of quercetin found anywhere in nature.

Quercetin is a plant compound that scientists have been studying for years because of its ability to support healthy blood vessels, reduce inflammation, and combat the oxidative stress that can contribute to rising blood pressure.

To see whether those benefits translated into real-world results, researchers recruited 68 overweight-to-obese adults with prehypertension or hypertension.

These weren’t healthy college students.

They were exactly the kind of people sitting in doctors’ offices every day being told their blood pressure is creeping higher and that medication is their only way out.

Participants received a quercetin-rich onion skin extract while researchers monitored their blood pressure around the clock using 24-hour ambulatory blood pressure monitoring—the gold standard for measuring what happens during normal daily life.

The results were impressive.

And remember: These changes didn’t take months. They appeared within just 24 hours.

Average 24-hour systolic blood pressure fell by 3.6 mmHg.

Daytime systolic blood pressure dropped by 4.7 mmHg.

Even nighttime blood pressure fell by 3.9 mmHg.

To put that in perspective, researchers noted that even a 2 mmHg reduction in systolic blood pressure has been linked to meaningful reductions in stroke risk and heart disease across large populations.

In other words, this kitchen scrap didn’t merely reach that benchmark—it exceeded it.

And it did so in a single day.

That’s remarkable when you consider how many people spend weeks or even months trying to achieve similar improvements through lifestyle changes alone.

Newer research suggests quercetin helps protect the lining of blood vessels, improve nitric oxide production, and reduce chronic inflammation throughout the cardiovascular system.

Think of nitric oxide as your body’s natural artery relaxer.

The more efficiently it works, the easier it is for blood to flow where it needs to go.

That’s a very different approach from simply forcing blood pressure lower.

Instead, researchers believe quercetin may help improve some of the underlying problems that cause blood pressure to rise in the first place.

Unfortunately, most of the quercetin in onions is concentrated in the outer layers that rarely make it onto our plates.

That’s why researchers used a concentrated onion skin extract rather than ordinary onions.

For those interested in trying it themselves, quercetin supplements are widely available online. One option is Pure Encapsulations Quercetin, which provides 250 mg per capsule.

There are also specialty onion skin extract supplements available, particularly from Japan, where onion skin preparations have long been used to support cardiovascular health.

It’s fascinating to think that one of nature’s most promising blood pressure compounds has been hiding in the garbage bin all along.

To healthy arteries and healthy pressure,

Ray Thatcher
Research Director, Health Sciences Institute

Sources:

Brüll, V., Burak, C., Stoffel-Wagner, B., Wolffram, S., Nickenig, G., Müller, C., Langguth, P., Alteheld, B., Fimmers, R., Naaf, S., Zimmermann, B. F., Stehle, P., & Egert, S. (2015). Effects of a quercetin-rich onion skin extract on 24 h ambulatory blood pressure and endothelial function in overweight-to-obese patients with (pre-)hypertension: a randomised double-blinded placebo-controlled cross-over trial. The British journal of nutrition, 114(8), 1263–1277. https://doi.org/10.1017/S0007114515002950

Mounir, R., Alshareef, W. A., El Gebaly, E. A., El-Haddad, A. E., Ahmed, A. M. S., Mohamed, O. G., Enan, E. T., Mosallam, S., Tripathi, A., Selim, H. M. R. M., Bukhari, S. I., Alfaraj, R., Ragab, G. M., El-Gazar, A. A., & El-Emam, S. Z. (2023). Unlocking the Power of Onion Peel Extracts: Antimicrobial and Anti-Inflammatory Effects Improve Wound Healing through Repressing Notch-1/NLRP3/Caspase-1 Signaling. Pharmaceuticals (Basel, Switzerland), 16(10), 1379. https://doi.org/10.3390/ph16101379