Protein and Fitness Amino Workout

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.

If optimizing your workout and supporting overall performance in and out of the gym is what you want, then try L-Arginine, an essential amino acid. As an essential amino acid, L-Arginine is one of the building blocks of protein. L-Arginine also supports immune function and the effects of a healthy exercise program. When trying to make the most out of your gym membership, add 21st Century's L-Arginine supplement to your gym bag.

L-Arginine is a conditionally essential basic amino acid involved primarily in urea metabolism and excretion as well as DNA synthesis. NOW L-Arginine Powder is a pharmaceutical-grade powder delivering 6 grams free-form L-arginine per serving. 

These days, more and more health conscious individuals are adding L-arginine to their nutritional regimen for everyday cardiovascular maintenance. The problem is, L-arginine doesn't last very long in the body—roughly one hour—which can limit the effectiveness of conventional L-arginine supplements. Swanson Ultra Pharmaceutical Grade AjiPure 1,000 mg L- Arginine solves this dilemma with state-of-the- art, sustained-release tablets that deliver the nutrient gradually over an eight-hour period for round-the-clock circulatory support.

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

1. Farney, T, et al., Journal of Strength and Conditioning Research 33(9):p 2464-2470, September 2019. | Read more.
2. Neri, L. Examine.com, accessed 10 June 2025
3. 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.

Throughout the body is a complex system of arteries, veins and capillaries through which the blood transports nutrients to cells, carries heat from the inner body to the skin and moves waste material to channels of elimination. The circulatory system is like a network of heavily traveled highways that keeps all components of the body connected and up to speed. Our goal is to maintain the condition and tone of the blood vessels so the “traffic” flows freely.

Swanson Super Strength L-Arginine is an antioxidant amino acid that helps encourage the production of nitric oxide, a compound that helps keep healthy blood vessels dilated to promote blood flow. Each serving delivers 850 mg of L-arginine.

Additionally, arginine is one of the three foundational amino acids—along with glycine and methionine—that the body uses to manufacture creatine, which in turn supports muscle growth and protein synthesis, and enhances energy production and cognitive function. Supplementing with L-arginine helps supply your body with the materials it needs to promote creatine production.

Get a high-potency amino acid boost for circulatory health and more with Swanson Arginine AKG Powder! The amino acid L-arginine is involved in many vital processes in the body, from detoxification to energy production, but it is in circulatory health where it has its greatest impact. L-arginine is a key player in the body's production of nitric oxide, a compound that helps keep blood vessels dilated to promote blood flow and help maintain blood pressure already within a normal range. This makes L-arginine beneficial for overall cardiovascular maintenance and in areas such as sexual function that depend largely on circulatory status. Our Arginine AKG Powder delivers a super-potent 5 grams per serving—a much higher dosage than other forms. This arginine powder features a delicious natural lemon flavor and dissolves readily in water to create a great-tasting nutritional drink.

Caution: Contains xylitol. Keep out of reach of pets; do not feed to pets.