L-Citrulline
L-citrulline is an amino acid that is converted to L-arginine in the kidneys and increases nitric oxide production. More effective than arginine itself for vasodilation.
What is L-Citrulline?
L-citrulline is a non-essential amino acid that plays an important role in the body's nitric oxide production. It is a metabolite of L-arginine and is converted into this amino acid in the kidneys. L-citrulline has become popular as a dietary supplement, especially among athletes and fitness enthusiasts, due to its potential benefits for performance and recovery.
How does it work in the body?
L-citrulline primarily works by increasing levels of L-arginine in the blood. When L-citrulline is ingested, it is converted into L-arginine, which is a precursor to nitric oxide (NO). Nitric oxide is a gas that acts as a vasodilator, meaning it helps to widen blood vessels. This can lead to increased blood flow and oxygen delivery to the muscles, which may improve both physical performance and recovery.
Scientific benefits
Several studies have investigated the effects of L-citrulline on physical performance and health. Here are some of the most prominent benefits:
- Improved endurance: A study published in the Journal of Strength and Conditioning Research showed that supplementation with L-citrulline can increase endurance during high-intensity exercise.
- Reduced muscle fatigue: Research has shown that L-citrulline can reduce the sensation of fatigue during exercise, allowing for longer and more effective training sessions.
- Enhanced muscle recovery: A study in Nutrition demonstrated that L-citrulline can accelerate recovery after intense exercise by reducing muscle damage and inflammation.
- Improved sexual function: Some studies have suggested that L-citrulline may help improve erectile function by increasing blood flow.
Dosage and recommendations
The recommended dose of L-citrulline can vary depending on individual needs and goals. Common doses range between 6 and 8 grams per day, especially before exercise. It is important to start with a lower dose to see how the body reacts and adjust as needed. Consulting a doctor or nutritionist before starting supplementation is advised.
Best sources and forms
L-citrulline is available in various dietary supplements, usually in powder or capsule form. It can also be found in certain foods, although the concentrated amounts are much lower than in supplements. Foods such as watermelon, cucumber, and pumpkin seeds contain L-citrulline, but to obtain significant amounts, supplements are a more effective option.
Side effects and warnings
For most people, L-citrulline is safe when used at recommended doses. Common side effects may include:
- Gastrointestinal discomfort
- Diarrhoea
- Nausea
Individuals with certain medical conditions, especially those affecting blood pressure or taking blood pressure medication, should consult a doctor before starting L-citrulline.
Frequently asked questions
Is L-citrulline the same as L-arginine?
No, L-citrulline and L-arginine are two different amino acids. L-citrulline is converted into L-arginine in the kidneys and has been shown to be more effective at increasing nitric oxide production.
Can I take L-citrulline every day?
Yes, many people take L-citrulline daily, especially athletes, to support their performance and recovery. However, it is important to follow recommended doses and consult a doctor if uncertain.
What are the best times to take L-citrulline?
It is recommended to take L-citrulline about 30 minutes before exercise to maximise its effects on blood flow and performance. It can also be taken in the morning for general health benefits.
Can L-citrulline help with sexual function?
Some studies suggest that L-citrulline may support sexual function by improving blood flow, but more research is needed to confirm these effects.
Are there any interactions with medications?
L-citrulline can interact with certain blood pressure medications, so it is important to consult a doctor before starting supplementation, especially if you have underlying health issues.
Related entries
L-Arginine
L-arginine is an amino acid and a precursor to nitric oxide (NO), which dilates blood vessels. Used for blood circulation, erectile function, and exercise performance.
Nitric Oxide
Nitric oxide (NO) is a signalling molecule that dilates blood vessels. Increased NO production improves blood flow, muscle pump during exercise, and cardiovascular health.
Pre-Workout
Pre-workout is a training supplement taken before exercise to increase energy, focus, and pump. Typically contains caffeine, beta-alanine, citrulline, and creatine.