Doctor's Best L Arginine provides long-lasting and instant release to boost nitric oxide production, supporting vibrant circulation for an active life daily. Backed by Doctor's Best's Science Based Nutrition ethos, this vegan, non GMO formula pairs instant relief with a long-lasting release element to help you train, recover, and feel balanced.

Available Sizes & Variants:

120 tablets - Steady daily dosing for ongoing performance

Benefits & Features:

• Boosts nitric oxide to improve blood flow during exercise.
• Designed for everyday use to support endurance and recovery after workouts.
• Delivers both instant and long-lasting release to maintain nitric oxide levels during exercise.
• Vegan, non GMO, gluten free and soy free formula for wide use.
• L Arginine is the lead ingredient, supporting nitric oxide production for improved circulation.

Doctor's Best has built a reputation on science based nutrition, with vegan, non GMO, gluten free and soy free standards. This L Arginine formulation delivers 1000 mg per two tablets, split into instant release and long-lasting halves to support steady nitric oxide levels. The company emphasises transparency and quality across its range, appealing to athletes and health enthusiasts who value reliability. In busy routines, a two layer approach helps with training, recovery and daily circulation. For wellness stacks, some users pair it with n acetylcysteine.

L-Arginine (as 500 mg immediate release and 500 mg sustained release from L-Arginine alpha-Keto-Glutarate), L-Arginine (as 500 mg immediate release and 500 mg sustained release from L-Arginine alpha-Keto-Glutarate)

• GTIN: 753950002005
• Manufacturer: Doctor's Best
• Categories: ArginineDoctor's BestL-ArginineNitric Oxide Boosters
• Best buy: 6 - 24 months+

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

Take 2 tablets daily without food, or as recommended by a nutritionally informed physician. Store in a cool, dry place. Warning: Consult your physician before using this product if you are pregnant, lactating, have a medical condition, are on prescription medications, or other supplements that may lower blood pressure while taking this product. Not for use by individuals under the age of 18 years. Keep out of reach of children.

Please consult the product packaging for accurate instructions on how to use the product.

*Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

The Active Ingredient Is: L-Arginine (Amino Acid)

L-Arginine is essentially an essential amino acid your body uses to make nitric oxide, which helps keep normal blood flow and vessels healthy. This product gives you L-Arginine in both immediate-release and sustained-release forms to help ensure it stays available.

This formula is vegan and non-GMO, with the sustained-release part using L-Arginine Alpha-Ketoglutarate. Other ingredients help with delivery and stability of the active amino acid while keeping vegan, gluten-free, and soy-free make-up.

What Does L-Arginine Do?

L-Arginine helps with the production of nitric oxide, which can support normal blood flow and circulation as part of healthy cardiovascular function. Scientific research suggests this mechanism may be linked to lasting support for athletic activity and recovery in appropriate contexts, in line with NHS/EFSA guidance.

Dr. Böger from the University of Göttingen found that L-Arginine supplementation can influence endothelial function and vascular responses, aligning with the role of nitric oxide in normal circulatory processes.

This supplement isn't intended to diagnose, treat, cure, or prevent any disease.

Doctor's Best has shown its dedication to quality through a science-led nutrition approach that meets Welzo's standards for effective, well crafted supplements. This brand emphasises vegan, non-GMO formulations and free-from ingredients like gluten and soy, reflecting a thoughtful pick of ingredients that supports a clear product ethos. By combining instant-release with timed-release delivery in a single L-Arginine formula, Doctor's Best shows a science-led approach to formulation that meets Welzo's evidence-based criteria.

What stands out in our assessment is their clear emphasis on validated formulation controls and consistency in production. Their focus on tablet uniformity and formulation processes helps ensure reliable product performance and safety, a standard we recognise and value as part of our in-house quality checks, discussed with Welzo's healthcare professionals and reviewed in our quality framework at how we verify ingredient quality.

All in all, this brand’s science-led mindset, paired with its ingredient integrity and carefully applied production practices, gives us confidence to recommend Doctor's Best L-Arginine as a well suited option within Welzo's curated range.