L-Citrulline is a non-essential amino acid found in watermelon. The body converts it to arginine, which then produces nitric oxide. This molecule relaxes blood vessels and supports circulation.
People take it for cardiovascular support, to help keep blood pressure in a normal range, and to improve exercise recovery by reducing muscle soreness and enhancing oxygen delivery. Pure L-Citrulline, unlike the malate form, offers a neutral taste and is easier on the stomach.
Most people mix L-Citrulline powder with water and take it 30-60 minutes before exercise, or on an empty stomach for better absorption. Some take it in the morning for general cardiovascular support.
Cautions: L-Citrulline can lower blood pressure. If you take blood pressure medication, talk to your doctor. High doses may cause mild stomach upset.