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Article Outline
A comprehensive look at L-Citrulline, the amino acid that's revolutionizing endurance performance through enhanced oxygen delivery.
1. Citrulline vs. Arginine: The Bioavailability Problem
- Why direct Arginine supplementation fails (first-pass metabolism)
- How Citrulline bypasses the liver to raise Arginine levels more effectively
- The research: Citrulline produces 2x more plasma Arginine than Arginine itself
2. The Nitric Oxide Pathway
- Citrulline → Arginine → Nitric Oxide (NO)
- How NO dilates blood vessels and improves oxygen delivery
- The "oxygen cost" reduction: running faster with less effort
3. Why 2:1 Malate Ratio Matters
- Malate's role in the Krebs cycle for ATP production
- How the 2:1 ratio optimizes both oxygen delivery AND energy production
- Clinical dosing: Why 6g is the research-backed effective dose
4. Real-World Endurance Benefits
- Study: 12% increase in time-to-exhaustion (Bailey et al., 2015)
- Reduced perceived exertion during sustained efforts
- Faster recovery between training sessions
5. Pump vs. Performance: Different Goals
Why bodybuilders use Citrulline for the "pump" aesthetic, but runners should care about the oxygen delivery benefits instead.
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