Ingredient Spotlight: Citrulline

The performance booster hiding in plain sight

Citrulline might not be as famous as creatine or caffeine, but it’s one of the most effective ingredients for endurance, blood flow, and training volume. Whether you’re lifting heavy, running long, or doing high-intensity circuits, citrulline helps your muscles do more—and feel better while doing it.

Let’s explore what it does, how it works, and why we included it in Metalite.

What Is Citrulline?

L-citrulline is a non-essential amino acid—your body can produce it, but not always in large enough amounts to support intense training. It’s found in small quantities in foods like watermelon, but supplementing gives you the levels needed for performance benefits.

In the body, citrulline converts into arginine, which increases nitric oxide (NO) production. This, in turn, improves blood flow, oxygen delivery, and nutrient transport to your muscles during training.

What It Does for Athletes

1. Improves Blood Flow
By boosting nitric oxide, citrulline helps widen blood vessels—a process known as vasodilation. This means better oxygen and nutrient delivery during workouts, and yes, a better “pump.”

2. Reduces Muscle Fatigue
Citrulline helps remove ammonia, a waste product that builds up during exercise and contributes to fatigue. This means you can go longer before muscles start to burn out.

3. Increases Training Volume
Studies show citrulline supplementation allows for more reps, more sets, and better performance in strength-based workouts.

4. Enhances Recovery
By improving circulation and reducing soreness, citrulline helps your body bounce back faster post-workout.

What the Research Says

• Perez-Guisado & Jakeman, 2010
  Showed that citrulline supplementation increased the number of reps performed in a bench press session and reduced muscle soreness 24 hours later.

• Bailey et al., 2015
  Found citrulline enhanced oxygen uptake and aerobic performance during high-intensity cycling.

• Glenn et al., 2016
  Reported improved muscular endurance and power output in trained individuals using citrulline.

Citrulline in Metalite

Each serving of Metalite contains 2,000 mg of L-citrulline—a functional dose that supports real-world training. Combined with creatine, beta-alanine, and electrolytes, it helps you push through limits and recover with less soreness.

This isn’t just about feeling good during exercising. It’s about delivering more oxygen, more nutrients, and more reps when it counts.

Final Thought

Citrulline is one of the most reliable, science-backed ingredients for boosting workout quality and endurance. Whether you’re chasing PRs or grinding through long training blocks, this amino acid helps your body do more—and recover better.

Metalite gives you what you need to go the distance. Citrulline is part of that edge.