NOW Arginine & Citrulline 500mg/250mg 120 VegeCapsules – Nitric Oxide Support for Circulation & Exercise Performance

NOW Arginine & Citrulline combines L-arginine (500mg) and L-citrulline (250mg) — two synergistic amino acids that work together to maximise nitric oxide (NO) production. Nitric oxide is the key signalling molecule that causes blood vessels to relax and dilate (vasodilation), improving blood flow and circulation throughout the body. This combination is used to support cardiovascular health, exercise performance, endurance, and muscle pump during training.

• L-Arginine 500mg + L-Citrulline 250mg per capsule
• Synergistic combination for maximum nitric oxide production
• Supports vasodilation, circulation, and blood pressure
• Improves exercise endurance and muscle pump
• 120 VegeCaps — non-GMO, GMP certified

Frequently Asked Questions

Why is citrulline combined with arginine?

L-arginine is the direct precursor to nitric oxide but is rapidly broken down in the gut and liver before reaching the bloodstream. L-citrulline has much better oral bioavailability and is converted back to arginine in the kidneys, raising blood arginine levels more effectively than arginine alone. Together, they provide superior and sustained nitric oxide support.

What are the cardiovascular benefits of nitric oxide?

Nitric oxide signals blood vessel walls to relax (vasodilation), reducing vascular resistance and improving blood flow. This supports healthy blood pressure, improves circulation to peripheral tissues, reduces arterial stiffness, and supports overall cardiovascular function.

Can NOW Arginine & Citrulline help with erectile dysfunction?

Nitric oxide is the primary mediator of penile erection — it is the same pathway targeted by phosphodiesterase inhibitors. L-arginine and L-citrulline have been studied for mild-to-moderate erectile dysfunction with modest positive results. They are not as potent as prescription medications but may provide meaningful support as a nutritional approach.

When should I take Arginine & Citrulline for exercise?

Take 30–60 minutes before exercise for pre-workout nitric oxide and performance support. Some people also take a dose on rest days to support ongoing cardiovascular and circulation benefits.

Is NOW Arginine & Citrulline safe for people with heart conditions?

Consult your cardiologist before taking arginine supplements if you have a history of heart attack, heart failure, or are on nitrate medications — as combining NO-boosting supplements with nitrates can cause dangerous blood pressure drops. For healthy adults, standard doses are generally well tolerated.