Top L-Arginine Brands to Boost Your Health Performance

L-arginine is an important amino acid that has gained popularity for its numerous health benefits, including improved blood circulation and enhanced physical performance. With the growing interest in this supplement, several brands have established themselves as leaders in the market. Some of the best brands that offer high-quality L-arginine supplements include NOW Foods, known for its affordable and effective products, and Nutricost, which is praised for its variety of dosage options. Additionally, brands like Thorne Research and Jarrow Formulas are often recommended for their commitment to purity and scientifically-backed formulations. Intrigued to know more about each brand's offerings and what sets them apart? Find all the details below.

Illustration of l arginine

Best brands of l arginine in 2025

Now Foods

NOW Foods has consistently been recognized as a leading producer of high-quality L-arginine supplements, offering a potent formula with up to 1000mg per serving since the early 2000's, boasting a purity level often exceeding 98%, ensuring maximum efficacy for athletes and health-conscious individuals, and maintaining rigorous testing standards to meet the needs of over 300,000 customers annually.

Optimum Nutrition

Optimum Nutrition is a leading brand in sports nutrition, offering products like Essential Amino Energy which includes micronized L-arginine, a key ingredient for nitric oxide production, supporting improved blood flow and nutrient delivery to muscles, with some products containing 5 grams of amino acid blend per serving and just 10 calories. Their Platinum series also features L-arginine in pre-workout formulas, often combined with L-citrulline and beta-alanine, designed for intense workouts, while their Amino Energy products aim for muscle recovery, energy, and focus.

BulkSupplements

BulkSupplements is a reputable brand for L-arginine, offering a 100% pure powder that is often third-party tested for quality and manufactured in cGMP compliant facilities, with many users reporting satisfaction with the product's effectiveness. Each serving typically provides 1000mg of L-Arginine, which can help boost nitric oxide production, supporting blood flow and overall athletic performance. Available since 2013, the product comes in various sizes and forms, including both L-Arginine base and HCL, and the unflavored powder allows for versatile mixing. For more detailed information, visit their official BulkSupplements website.

Doctor's Best

Doctor's Best is a reputable brand known for producing high-quality L-Arginine supplements, available in both powder and sustained-release tablet forms, with the powder offering a pure, unflavored option that many users mix into beverages, and the sustained-release tablets using a bilayer technology to provide both immediate and extended release of 500mg L-Arginine per tablet, for a total of 1000mg per serving. Research suggests that L-Arginine can support athletic endurance, boost nitric oxide production for cardiovascular health, and aid in muscle recovery. Many customers have reported noticeable improvements in workout performance and overall energy levels with the use of Doctor's Best L-Arginine products.

Thorne Research

Thorne Research is a top producer of L-arginine supplements, utilizing a sustained-release formula called Time-Sorb® to maintain optimal levels over 24 hours, with studies showing improved blood flow, cardiovascular support, and enhanced exercise capacity. Their L-Arginine product, available in 120 capsule bottles, is also known as Perfusia-SR, and is free of gluten, soy, and dairy, offering 2000 mg of L-arginine per serving of 4 capsules, intended for twice-daily use, and has been available since 2008. L-arginine is a precursor to nitric oxide, which relaxes blood vessels, and it helps with wound healing. The sustained release formulation has been studied and shown to improve vascular compliance and lower blood pressure, and is intended for adult use. You can find Thorne Research's L-Arginine product online.

Nature's Bounty

Nature's Bounty is a well-known producer of L-Arginine, offering a 1000mg dose per tablet, which is intended to support blood flow, heart health, and the effects of exercise, with the product being non-GMO and gluten-free since at least 2015. This amino acid supplement is one of 20 amino acids that are building blocks of protein, and is involved in various important pathways throughout the body, with adults typically taking one tablet three times daily, preferably with meals, while some users have reported improvements in energy levels and blood pressure. Nature's Bounty L-Arginine is laboratory tested and available in various forms, including tablets and softgels, generally containing less than 2% of other ingredients like vegetable cellulose, silica, and magnesium stearate.

Pure Encapsulations

Pure Encapsulations is a highly reputable brand, exceeding the standards set by the United States Pharmacopeia (USP), and is often recommended by healthcare professionals for their L-Arginine supplements, which are clinically tested and made with high-quality vegan ingredients, providing 1400mg of L-Arginine per two-capsule serving to support cardiovascular health, blood flow, and nitric oxide production. These supplements are free from common allergens, GMOs, and unnecessary additives, and are available in 90 or 180 capsule bottles.

Jarrow Formulas

Jarrow Formulas is recognized as a high-quality producer of L-Arginine, offering a 1000mg dose per tablet, supporting nitric oxide production and protein synthesis, with their vegan, non-GMO, and gluten-free tablets; many customers report increased energy and improved circulation. Jarrow Formulas L-Arginine is available in a 100-tablet bottle, with an "Easy-Solv" design for quick disintegration, and is considered an economical option. You can find the product here.

Nutricost

Nutricost is a trusted brand providing high-quality L-Arginine supplements, with their powder form offering 5000mg per serving, and available in various sizes such as 250g, 500g, and 1kg, ensuring a 100% pure product with no fillers, that is also gluten-free and non-GMO and manufactured in a GMP-compliant, FDA-registered facility; with many customers reporting positive results in areas such as increased energy, workout performance, and overall well-being, and this brand was founded to revolutionize the supplement industry.

GNC

GNC is a well-regarded brand for L-Arginine supplements, offering products like their 1000mg caplets which are designed to support nitric oxide production, and maintain healthy blood vessel tone, as well as help remove ammonia from the body, with some users reporting increased energy and endurance; each serving typically contains 1 gram of L-Arginine and the product comes in various sizes such as 90, or 180 caplets. GNC's L-Arginine is often used by athletes to help with muscle recovery and to improve blood flow during workouts, and since 1935 they are committed to quality products.