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Citrulline is an amino acid commonly used in sports supplements due to its ability to improve blood circulation, reduce fatigue, and increase physical performance. Citrulline can be found in several forms:
L-Citrulline: This is the purest form of citrulline, often used in sports supplements because it effectively increases vasodilation and improves blood flow.
Citrulline Malate: This is a combination of citrulline and malic acid. Citrulline malate is the most popular form of citrulline in the sports supplement market. Malic acid helps increase energy production, so this combination not only improves blood flow but also boosts energy levels and reduces muscle fatigue.
Citrulline DL-Malate: This form contains both L-citrulline and D-citrulline. D-citrulline is a less active form, but this combination still has similar benefits to pure citrulline malate.
Each of these citrulline forms has its specific properties and benefits, but all contribute to improved physical performance and faster recovery after training. When choosing a citrulline supplement, it is important to consider the form used and your personal goals and needs.
Citrulline is an amino acid that improves blood circulation, increases nitric oxide levels in the body, thereby promoting vasodilation and enhancing muscle oxygen and nutrient supply. This helps reduce muscle fatigue and increase endurance during training. Citrulline also promotes ammonia removal, reducing muscle soreness and fatigue after workouts. Citrulline malate is especially beneficial as it additionally increases energy production and reduces muscle acidity.
L-citrulline is a non-essential amino acid that has become an intriguing choice in sports nutrition supplements, offering a natural way to improve athletic performance. In the body, it is converted into L-arginine in the kidneys, triggering a beneficial physiological cascade that contributes to physical performance and recovery. Unlike many supplements whose claims are often unsubstantiated, the effect of L-citrulline on nitric oxide production and muscle function is supported by scientific research, gaining attention from scientists and sports professionals.
L-citrulline improves blood flow, stimulates muscle protein synthesis, and increases antioxidant activity. Almost all scientific studies on L-citrulline relate to its role as a key amino acid in nitric oxide production and vasodilation, according to https://www.mdpi.com/. This amino acid has higher bioavailability than directly consumed L-arginine, making it more effective for NO production.
Its action is based on metabolic mechanisms involving the urea cycle and an enzymatic reaction catalyzed by nitric oxide synthase. L-citrulline absorption in cells occurs through sodium-dependent and independent transport systems in intestinal epithelial cells. These processes improve oxygen delivery to muscles, reduce fatigue, and contribute to better physical performance. Additionally, L-citrulline supports thermotolerance during physical exertion, which can be very important for endurance athletes, according to https://consensus.app/.
Supplementing with L-citrulline can enhance athletic performance by increasing exercise tolerance, improving blood flow, and oxygen utilization. Studies show that its use may improve endurance and strength results.
L-citrulline stimulates nitric oxide production, which dilates blood vessels and improves muscle oxygen supply. Better blood flow may be associated with improved training outcomes, including more repetitions during resistance training and reduced muscle fatigue. Research has shown that supplementation can reduce muscle soreness by 40–42% after physical exertion. A recent study with horses showed that L-citrulline supplementation shortened race times by 2.51%, according to https://www.mdpi.com. It is also noted that 8 g of citrulline taken an hour before exercise can be especially beneficial for upper and lower body resistance exercises.
Gender-based studies indicate positive effects for both men and women. Women notably improve grip strength and power, which can be beneficial in sports like tennis. Additionally, supplementation may shorten time to exhaustion and optimize oxygen consumption during physical exertion.
Daily doses of L-citrulline typically range from 3 to 6 grams, and to achieve an equivalent effect to citrulline malate, 8 grams may be required. For optimal results, athletes should choose doses based on training goals and preferred supplement form. Natural sources like watermelon can also help increase citrulline levels, according to https://www.healthline.com. Studies show that L-citrulline intake increases nitric oxide production in the body, according to https://www.performancelab.com.
Strength training: Take 8 g of citrulline malate about 60 minutes before training.
Endurance results: Take 6 g of L-citrulline daily for seven days to increase muscle oxygen saturation.
Pre-workout pump effect: Take 3–5 g of L-citrulline or 6–8 g of citrulline malate before training.
Doses above 10 grams generally do not provide additional benefits and are not necessary to improve results. Dosage may vary depending on individual needs, so it is essential to consult a doctor or trainer before starting supplementation. Adequate water intake is important for optimal performance.
L-citrulline Safety and Precautions
L-citrulline is generally considered safe for short-term use up to 2 months. Recommended daily doses range from 1.5 to 5 grams, with an ideal dose for sports being 3–6 grams of L-citrulline or 8 grams of citrulline malate. Doses exceeding 10 grams may cause adverse effects such as gastrointestinal discomfort, according to https://www.webmd.com. Regular monitoring ensures nitrogen balance in the body, according to https://www.medicinenet.com.
To avoid blood pressure complications, discontinue supplementation at least 2 weeks before planned surgery.
Avoid taking with blood pressure-lowering medications or phosphodiesterase-5 inhibitors, as this may dangerously lower blood pressure.
If you have kidney problems or low blood pressure, use with caution as L-citrulline may affect these conditions.
Pregnant, breastfeeding, or individuals with health issues should consult a doctor before starting supplementation.
When taking L-citrulline supplements, it is essential to ensure adequate water intake to maintain overall health.
It is important to drink water when taking this supplement to maintain overall health.
