The Amino Acid Older Adults Are Using to Support Heart Health and Energy

Health Points

• L-citrulline is a naturally occurring amino acid that may support cardiovascular health by improving blood flow and circulation
• Research suggests the compound could help reduce blood pressure and enhance exercise performance, particularly beneficial for adults over 40
• Found in watermelon and available as a supplement, L-citrulline converts to L-arginine in the body, which produces nitric oxide to relax blood vessels

As Americans look for natural ways to support their cardiovascular health in midlife and beyond, one amino acid is gaining attention from health researchers and wellness experts alike. L-citrulline, a compound found naturally in watermelon and other foods, has emerged as a promising supplement for those seeking to maintain healthy circulation and energy levels.

The amino acid works by converting to L-arginine in the body, which then produces nitric oxide—a molecule that helps relax and widen blood vessels. This process can improve blood flow throughout the body, a particularly important function as we age and our vascular systems naturally become less efficient.

Recent studies have shown encouraging results for L-citrulline’s potential health benefits. Research indicates the compound may help lower blood pressure in adults, support better exercise performance, and promote overall cardiovascular function. For those in their 40s, 50s, and beyond, these benefits align with common health priorities during this life stage.

The supplement comes in two primary forms: L-citrulline and citrulline malate, which combines the amino acid with malic acid. Both versions are available over the counter, though experts recommend consulting with a healthcare provider before starting any new supplement regimen, especially for individuals taking blood pressure medications or other cardiovascular drugs.

Natural food sources of L-citrulline include watermelon—particularly the rind—as well as cucumbers, pumpkins, and other members of the gourd family. However, obtaining therapeutic amounts through diet alone can be challenging, which is why many people turn to supplementation.

Typical supplement doses range from 3 to 6 grams daily, though optimal dosing can vary based on individual health goals and conditions. Studies examining cardiovascular benefits have used doses in this range, while research on exercise performance has sometimes employed higher amounts.

The safety profile of L-citrulline appears favorable in research conducted to date. Most people tolerate the supplement well, with few reported side effects. When side effects do occur, they’re typically mild and may include stomach discomfort or changes in digestion.

One key advantage of L-citrulline over direct L-arginine supplementation is its superior absorption and bioavailability. Because L-citrulline converts to L-arginine in the kidneys rather than the digestive tract, more of the beneficial compound reaches the bloodstream and can exert its effects on blood vessels.

For older adults concerned about maintaining healthy blood pressure, the research on L-citrulline offers particular promise. Several studies have demonstrated modest but meaningful reductions in both systolic and diastolic blood pressure readings among participants taking the supplement regularly.

The compound’s potential to enhance exercise capacity also appeals to active adults looking to maintain their fitness routines as they age. Improved blood flow can mean better oxygen delivery to working muscles, potentially reducing fatigue and supporting endurance.

While L-citrulline shows promise, it’s important to view it as one component of a comprehensive approach to cardiovascular health. Regular physical activity, a balanced diet rich in fruits and vegetables, stress management, and adequate sleep all remain foundational for heart health at any age.

Those interested in trying L-citrulline should look for reputable supplement brands that undergo third-party testing for purity and potency. Quality can vary significantly among products, and choosing a verified brand helps ensure you’re getting what the label promises.

As with any supplement, individual results may vary, and L-citrulline is not intended to replace prescribed medications or medical treatment. Anyone with existing cardiovascular conditions, kidney issues, or those taking multiple medications should discuss supplementation with their doctor before beginning.

The growing interest in L-citrulline reflects a broader trend toward evidence-based natural health approaches that complement traditional medical care. For health-conscious adults seeking to support their cardiovascular wellness, this amino acid represents an option worth discussing with healthcare providers as part of an overall health strategy.