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Support muscle growth and recovery with Swanson L-Glutamine. Glutamine is the most abundant free amino acid found in the muscles of the body. It may also minimize muscle breakdown and improve protein metabolism. Supporting muscle health and strength promotes joint comfort which is key to mobility and healthy aging.
A versatile amino acid, glutamine may also benefit cognitive function and brain health. It is able to cross the blood-brain barrier and acts as a precursor to important neurotransmitters such as glutamate, aspartate and GABA.
Glutamine also provides fuel for immune cells through its activity in the gut where it may help maintain intestinal barrier function to promote GI tract integrity. Since a solid 70% of your immune system stems from your gut, keeping your digestive system happy is a win for your immune function as well.
Glutamine aids in the production of glutathione, often called the “master antioxidant.” Antioxidants help the body combat oxidative stress caused by free radicals which can in turn support the health of cells and bodily systems as we age.
Support muscle growth and recovery with Swanson L-Glutamine. Glutamine is the most abundant free amino acid found in the muscles of the body. It may also minimize muscle breakdown and improve protein metabolism. Supporting muscle health and strength promotes joint comfort which is key to mobility and healthy aging.
A versatile amino acid, glutamine may also benefit cognitive function and brain health. It is able to cross the blood-brain barrier and acts as a precursor to important neurotransmitters such as glutamate, aspartate and GABA.
Glutamine also provides fuel for immune cells through its activity in the gut where it may help maintain intestinal barrier function to promote GI tract integrity. Since a solid 70% of your immune system stems from your gut, keeping your digestive system happy is a win for your immune function as well.
Glutamine aids in the production of glutathione, often called the “master antioxidant.” Antioxidants help the body combat oxidative stress caused by free radicals which can in turn support the health of cells and bodily systems as we age.
Glutamine is involved in maintaining a positive nitrogen balance (an anabolic state) and also aids rapidly growing cells (immune system lymphocytes and intestinal cell enterocytes). Glutamine has recently been the focus of much scientific interest. A growing body of evidence suggests that during certain stressful times, the body may require more glutamine than it can produce. Under these circumstances, glutamine may be considered a "conditionally essential" amino acid. In addition, glutamine is a regulator of acid-base balance and a nitrogen transporter.
Stock up on NOW®'s L-Glutamine Powder today! Glutamine has recently been the focus of much scientific interest. A growing body of evidence suggests that during certain stressful times, the body may require more glutamine than it can produce. Under these circumstances, glutamine may be considered a "conditionally essential" amino acid. Glutamine is involved in maintaining a positive nitrogen balance (an anabolic state) and also aids rapidly growing cells (immune system lymphocytes and intestinal cell enterocytes). In addition, glutamine is a regulator of acid-base balance and a nitrogen transporter.
Try NOW® Sports L-Glutamine Powder today! Glutamine has recently been the focus of much scientific interest. A growing body of evidence suggests that during certain stressful times, the body may require more glutamine than it can produce. Under these circumstances, glutamine may be considered a "conditionally essential" amino acid. Glutamine is involved in maintaining a positive nitrogen balance (an anabolic state) and also aids rapidly growing cells (immune system lymphocytes and intestinal cell enterocytes). In addition, glutamine is a regulator of acid-base balance and a nitrogen transporter.
You know watermelon is a tasty summertime treat, but did you know it’s also one of nature’s best sources of citrulline? Unfortunately you’d have to eat several pounds of watermelon every day to reap the benefits. Just what is citrulline though? It's bursting onto the fitness scene in a big way, helping people of all ages break through the boundaries of personal health and fitness. L-citrulline is active in both the Krebs cycle and the Urea cycle of metabolism, which means it promotes energy production to fuel activity while simultaneously helping to rid the body of metabolic waste products, helping to promote muscle recovery after exercise1. The addition of malate, a form of malic acid, further bolsters the bioavailability of L-citrulline.
L-citrulline is an amino acid precursor to—and more efficiently absorbed by the body than—arginine which in turn produces nitric oxide. Nitric oxide works to deliver oxygen and other nutrients throughout the body to feed muscles and tissues. This is especially beneficial during high-intensity exercise, and may also help maintain blood pressure already within the normal range2, support men’s sexual health2, and encourage active aging by promoting cardiometabolic health in older adults3.
Sources
- Farney, T, et al., Journal of Strength and Conditioning Research 33(9):p 2464-2470, September 2019. | Read more.
- Neri, L. Examine.com, accessed 10 June 2025
- Allerton TD, et al. Nutrients. 2018 Jul 19;10(7):921. Read more.
Move over creatine! Swanson® L-Citrulline Malate Complex is the energizing combination that kicks in beyond the Krebs cycle. It's bursting onto the nutrition scene in a big way, helping people young and old break through the boundaries of physical health, energy and performance. L-Citrulline Malate is active in both the Krebs cycle and the urea cycle of metabolism, which means it promotes energy production while simultaneously helping to rid the body of fatigue-causing metabolic waste products.
L-Citrulline is a unique amino acid first isolated from watermelon and produced in the body from the amino acids ornithine and arginine. It's a key player in the urea cycle, which is the process responsible for eliminating the metabolic by-products of protein metabolism. These by-products, primarily ammonia and lactic acid, contribute to muscle fatigue. By helping to efficiently remove them, L-citrulline helps fend off fatigue for greater comfort and endurance. L-citrulline also acts as a precursor to nitric oxide, a compound that helps relax blood vessels to promote healthy circulation and ensure a steady supply of oxygen and nutrients throughout the body.
Malic acid is an organic compound made by all living organisms. It performs a vital function in cellular energy production as an intermediary in the Krebs cycle (also known as the citric-acid cycle), the metabolic pathway that produces ATP (adenosine triphosphate), the primary energy source for every cell in the body.
The dual-action effects on energy production and waste elimination make our L-Citrulline Malate Complex the perfect nutritional boost for physical comfort and endurance.
NOW Foods' L-Citrulline Powder not only supports detoxification pathways, but also supports nitric oxide production and a healthy cardiovascular system. Citrulline is a non-essential amino acid that is an important intermediate in the urea cycle, functioning along with Arginine and Ornithine to rid the body of ammonia, a byproduct of protein metabolism. Because Citrulline is a precursor of Arginine, it provides a readily available source material for Arginine production, which in turn, can be used for the production of Nitric Oxide (NO). NO plays a fundamental role in vascular function and blood flow.
NOW Foods' L-Glutamine features 500 mg per capsule. Glutamine has recently been the focus of much scientific interest. A growing body of evidence suggests that during certain stressful times, the body may require more glutamine than it can produce. Under these circumstances glutamine may be considered a "conditionally essential" amino acid. Glutamine is involved in maintaining a positive nitrogen balance (an anabolic state) and also aids rapidly growing cells (immune system lymphocytes and intestinal cell enterocytes). In addition, glutamine is a regulator of acid-base balance and a nitrogen transporter.
Glutamine has recently been the focus of much scientific interest. A growing body of evidence suggests that during certain stressful times, the body may require more glutamine than it can produce. Under these circumstances, glutamine may be considered a "conditionally essential" amino acid. Glutamine is involved in maintaining a positive nitrogen balance (an anabolic state) and also aids rapidly growing cells (immune system lymphocytes and intestinal cell enterocytes). In addition, glutamine is a regulator of acid-base balance and a nitrogen transporter.
Pure Encapsulation's l-Glutamine powder provides a key amino acid in a convenient form. L-Glutamine is the most abundant amino acid in the body. In times of metabolic stress, glutamine is utilized by the body for tissue repair, gastrointestinal tract support and natural defense system function. Glutamine plays a large role in maintaining healthy intestinal integrity by enhancing the intestines protective mucosal lining. In addition, glutamine is important in the preservation of muscle mass.
Fortify your muscles and your mind every day with the pure amino acid nutrition of Swanson L- Glutamine! A favorite among fitness buffs, glutamine is the most abundant amino acid in skeletal muscle tissues, where it works to promote strength and endurance—but that's not all it does. Glutamine's unique molecular structure allows it to pass through the blood/ brain barrier to nourish vital brain tissues. Once in the brain, glutamine is converted into glutamic acid, the base material for key neurotransmitters needed for healthy mental and nervous system function.
Glutamine also provides fuel for immune cells through its activity in the gut where it may help maintain intestinal barrier function to promote GI tract integrity. Since a solid 70% of your immune system stems from your gut, keeping your digestive system happy is a win for your immune function as well. Swanson L-Glutamine Powder mixes easily into juice or water and delivers a potent 5 g per scoop.
L-leucine is an essential amino acid and it must be acquired through diet or supplementation. Food sources for L-leucine are meat, almonds, cashews eggs, fish, chicken, lentils and liver. It helps increase energy, enhance endurance and aid in muscle recovery. Swanson L-Leucine delivers a potent 500 mg per serving from vegan-sourced AjiPure pharmaceutical grade L-leucine.
Healthy Origins® Natural D-Ribose is a primary building block in the production of adenosine triphosphate (ATP), the body's main energy source. It also helps promote cardiovascular health and muscle recovery. This powder formula is non-GMO and vegan-friendly.
Healthy Origins Performance L- Citrulline is a premium dietary supplement designed to support overall health and wellness. Made in the USA from globally sourced ingredients, this non-GMO, gluten-free, and vegan formula is an excellent choice for those looking to enhance the urea cycle and optimize athletic performance. L-Citrulline is a vital amino acid naturally produced by the body, playing a key role in supporting healthy Nitric Oxide (NO) levels. It also contributes to the mitochondrial stage of the urea cycle, aiding in the efficient removal of ammonia from the body. Additionally, as a precursor to L-Arginine, L-Citrulline helps elevate L-Arginine levels in the blood and muscle tissue, making it an essential component of cardiovascular health and athletic performance support.