What aldosterone and nitric oxide reveal about hard-to-treat blood pressure

High blood pressure isn’t always just about lifestyle.

For years, the focus has been on salt, stress, weight and exercise — and those factors do matter. But researchers are now uncovering another piece of the puzzle that can quietly keep blood pressure elevated, even when someone is following medical advice closely.

In some cases, the issue may come down to how the body regulates certain hormones that control fluid balance and blood vessel function — especially one called aldosterone.

It starts in your adrenal glands

For some people, one of the key contributors to resistant high blood pressure is a hormone called aldosterone.

Aldosterone is produced by your adrenal glands and signals your kidneys to retain sodium and water. While this is helpful for maintaining fluid balance, too much aldosterone can increase blood volume and raise blood pressure.

This may help explain why some people continue to struggle with high readings even when they reduce salt intake and follow standard treatment recommendations.

Targeting aldosterone may help lower blood pressure

Researchers have been studying a new drug called baxdrostat, which works as an aldosterone synthase inhibitor — blocking the body’s ability to produce excess aldosterone.

In the Phase III BaxHTN trial involving nearly 800 patients across 214 clinics worldwide, participants received either baxdrostat or a placebo alongside their usual medications.

After 12 weeks, those taking baxdrostat experienced systolic blood pressure reductions about 9 to 10 mmHg greater than placebo.

This level of reduction is considered clinically meaningful and is associated with a lower risk of heart attack, stroke and other cardiovascular events.

Additionally, about 40% of patients reached healthy blood pressure levels, compared with fewer than 20% in the placebo group.

While baxdrostat is still under investigation and not yet widely available, these findings highlight how important aldosterone can be in certain cases of resistant hypertension.

Why this matters beyond one new drug

This research is important not just because of the potential for a new and effective treatment, but because of what it reveals.

If lowering aldosterone significantly improves blood pressure in people already on blood pressure medications, it suggests that this hormone may be an important contributor in cases where blood pressure is difficult to control.

In some situations, the issue may not be that treatment isn’t strong enough, but that it isn’t addressing all of the underlying biological factors.

The connection between nitric oxide and aldosterone

In addition to pharmaceutical approaches, early research points to another biological pathway that may influence aldosterone: nitric oxide.

Nitric oxide is a naturally produced molecule the body produces that helps blood vessels relax and supports healthy circulation.

Laboratory studies using animal models and human adrenal cells have shown that nitric oxide can inhibit aldosterone production under certain conditions. Small human studies have also found that blocking nitric oxide production can increase aldosterone levels.

Together, these findings suggest a regulatory balance in the body: nitric oxide supports blood vessel relaxation, while excess aldosterone promotes fluid retention and increased blood pressure.

How to support nitric oxide naturally

Supporting nitric oxide production may help promote healthy blood vessel function as part of an overall heart health strategy.

Certain foods are rich in natural compounds that the body can convert into nitric oxide. These include:

• Beets
• Spinach
• Arugula
• Celery

Beets, in particular, are one of the most well-researched dietary sources for supporting nitric oxide production.

Regular physical activity is also one of the most effective ways to boost nitric oxide, as it stimulates the cells lining your blood vessels.

At the same time, nitric oxide levels can be reduced by factors such as:

• Aging
• Smoking
• Chronic inflammation
• Elevated cortisol
• Oxidative stress
• Diets low in antioxidants

Addressing these factors may help support your body’s natural ability to maintain healthy circulation.

A more complete picture of blood pressure

Research like this helps us understand the many factors that can influence blood pressure.

Hormones like aldosterone may play a role in some individuals, and new treatments are being developed to target these pathways more directly.

While medications like baxdrostat are still being studied, lifestyle strategies that support nitric oxide production may naturally complement your overall approach to healthy living.

People with a condition that causes a high output of adostersone need to monitor salt intake very closely. The combination of salt and aldosterone increases reactive oxygen species (free radicals), which inhibits the production of nitric oxide.

Sources:
Efficacy and Safety of Baxdrostat in Uncontrolled and Resistant Hypertension — The New England Journal of Medicine

Scientists reveal new blood pressure treatment that works when others fail — ScienceDaily

NO synthase inhibition increases aldosterone in humans — NIH

The role of nitric oxide in the regulation of aldosterone synthesis by adrenal glomerulosa cells — NIH