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L-Citrulline vs. Creatine: A Comprehensive Guide

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Supplements are essential in enhancing the fitness and muscle building of a person and in the fitness and muscle building world, the success of supplements has been a great success. Out of all supplements that are offered, L-Citrulline and Creatine are the most useful ones, evidencing an array of positive effects and being in the center of the spotlight. In this article, you will find a detailed comparison of L-Citrulline and Creatine in order to avoid confusion and make an informed decision on your part concerning their benefits, modes of action, scientific evidence and expert opinions.

What is L-Citrulline?

L-Citrulline is a naturally occurring amino acid native to food such as watermelon, cucumbers and pumpkins. L-Citrulline is not involved in protein manufacture as is the case with other amino acids. It is rather essential in the urea cycle assisting in eliminating of ammonia as well as increasing nitric oxide production.

L-Citrulline

Benefits of L-Citrulline.

1. Enhanced Blood Flow: L-Citrulline supplementation promotes the production of Nitric Oxide that causes the blood vessels to dilate (widen) increasing blood circulation.

2. Improved Endurance: L-Citrulline keeps ammonia and other waste products accumulations at a minimum during exercise thus postponing fatigue and extending endurance.

3. Reduced Muscle Soreness: L-Citrulline supplementation promotes muscle soreness reduction after vigorous exercise and helps to recover faster.

Scientific Evidence.

L-Citrulline has proved its performance enhancement power in exercise performance in research studies. In a research conducted in the Journal of the International Society of Sports Nutrition, individuals using L-Citrulline recorded a great aerobic and anaerobic performance whereas the placebo showed no such increase.

What is Creatine?

Creatine is an internal muscular cell compound. It assists to generate energy during the rigorous exercise by recharging adenosine triphosphate (ATP) which is the currency of energy in the cells. Creatine can be synthesized by our liver, kidneys and pancreas, it can also be provided by the diet, such as meat, and fish.

Benefits of Creatine.

1. Increased Muscle Mass: Creatine happens to be one of the most successful muscle mass supplements. It can build the muscle and increase the amount of water present in the muscles as well as increase the production of proteins.

2. Improved Strength and Power: Based on research, creatine supplementation has been observed to boost resistance and power and enhance performances during short duration, high-intensity exercise such as sprinting and weight training.

3. Enhanced Recovery: Creatine facilitates the recovery process as it reduces muscle cell destruction and inflammation after an exhaustive exercise.

Scientific Evidence.

Creatine is the most-researched supplement in the world and its effectiveness has been proven many times. Drawn through a meta-analysis, a study presented in the Journal of Strength and Conditioning Research showed that creatine supplementation is very effective in increasing muscle power output as well as strength.

L-Citrulline vs. Creatine: Mechanisms of Action.

L-Citrulline.

The main effect of L-Citrulline includes the synthesis of nitric oxide (NO). Vasodilation occurs at high levels of NO and enhances blood circulation and oxygen supply to the muscles in the event of exercise. This leads to increased stamina, less muscle fatigue, and recover.

Creatine.

Creatine acts by saturating the ATP levels in the muscles. ATP is used up quickly during intensive exercise. Creatine phosphate transfers phosphate molecule to ADP to re-form ATP and to supply a immediate source of energy. This system aids greater strength, power and muscle mass.

💡 Expert Opinions.
In order to have a balanced opinion, we interviewed Dr. John Matthews, who is a sport nutritionist, and Jane Rogers, a fitness instructor.  
Dr. John Matthews.
L-Citrulline and Creatine are great supplements although they have various purposes. L-Citrulline is excellent supplement for endurance athletes because it facilitates blood flow and can result in less muscle soreness. Conversely, creatine is more fitting to anyone who wants to gain muscle size and strength. You may even find you have a benefit of taking the two supplements depending on the objectives you have in mind with your fitness program.”  
Jane Rogers.
Personally, I have clients who use Creatine, and after a couple of weeks, they record a significant increase in muscular strength and bulk. L-Citrulline is excellent in treating post-exercise soreness that is very important to people who work out extensively. I have witnessed athletes become better through the application of these two in their routine.”
Bottom Line.

L-Citrulline and Creatine are effective in their own ways and may improve your fitness experience. L-Citrulline is perfect to boost your stamina, decrease muscle fatigue and increase blood circulation, so endurance sportspeople, as well as anyone interested in bettering their recovery, should take L-Citrulline. Creatine is an excellent nutrient that enhances muscle mass, strength, and power, and is an ideal nutrient among bodybuilders and individuals who undertake rigorous exercises.

Based on this gathering of information, and what it is you want to achieve concerning fitness, it is now possible that you can read enough and make a decision between using L-Citrulline alone, Creatine alone, or both of them. Before attempting to embark on a new supplement routine, it is good always to speak to a health expert or a nutritionist to help you decide whether or not new routine fits your health requirements or fitness goals.

Combining these supplements with a healthy diet and regular training, you will be able to get the best out of yourself and performance in order to attain new performance thresholds in your pursuit of fitness.

Last reviewed on

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Our team of experts is always monitoring the health and wellness field, ensuring that our articles are updated promptly as new information emerges. See Our Editorial Process

Current Version
Jul 12, 2025

Written By: Lisa Valente

Reviewed By: Laine Greenawalt

Sep 17, 2024

Written By: Lisa Valente

Reviewed By: Laine Greenawalt

The dietary recommendations provided here are based on research and expert review. Individual needs vary — please consult a registered dietitian or nutritionist before changing your diet. Know More

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Evidence Based

This content is based on scientific research and written by experts.

Our team of licensed health professionals, nutritionists and fitness experts endeavor to be unbiased, objective, honest and to present each sides of the argument.

This article contains scientific references. The numbers in the parentheses (1,2,3) are clickable links to peer-reviewed scientific researches.

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