L-Arginine helps nitric oxide production to boost healthy blood flow, supporting cardiovascular function and exercise performance for day-to-day wellbeing and active lifestyles. As a single-ingredient formula, it offers a simple, reliable maintenance option that keeps things easy. Douglas Laboratories brings evidence-based quality to this health supplements staple, backed by decades of clinical focus.

Available Sizes & Variants:

100 capsules – a standard daily maintenance dose for ongoing support.

Benefits & Features:

• Keeps steady nitric oxide support for daily vitality.
• Supports healthy blood flow by delivering the key precursor for nitric oxide.
• A single-ingredient formula provides a reliable maintenance dose in a convenient capsule, making it easier to slip into a daily routine without adding complexity to your supplements stack.
• Manufactured by Douglas Laboratories, a trusted name with GMP standards and third-party testing to guarantee purity and potency.

Douglas Laboratories has earned a reputation for science-based nutrition for more than six decades, and this L-Arginine formula stays true to that heritage. Simple to add to daily routines. The operation runs GMP-compliant and NSF registered facilities, with an ISO-17025 accredited internal lab and independent third-party testing to ensure purity and potency. Consistency matters. As a single-ingredient product, it offers a straightforward way to support nitric oxide production and vascular health as part of a thoughtful health supplements routine. Trusted by clinicians.

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.

The supplement is utilized for various purposes, such as improving overall health, boosting energy levels, and aiding weight loss. Additionally, it can also be used to enhance athletic performance, strengthen the immune system, and promote better sleep. Moreover, the supplement is known to support heart health, improve brain function, and aid in managing certain medical conditions. Furthermore, it is commonly used to increase muscle mass, decrease inflammation, and improve digestion. Lastly, the supplement may also be used as a preventative measure against certain diseases and to maintain overall well-being. The golden hue of turmeric brightens curries\, condiments\, and egg\, fish\, and grain dishes. Its taste is warmly aromatic--a bit like ginger and pepper. In India turmeric is often used to color sweet dishes\, while in Morocco it's used to spice meat\, (especially lamb) and vegetables. It's used with fish\, in baked goods\, meat and meat products\, prepared mustards and pickles\, broths\, cheeses\, dressings\, grains\, egg recipes\, and soups. Try it with artichokes and potatoes and in rice dishes. And combine it with coriander and cinnamon for a spicy meat or poultry rub.

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

1. Promotes healthy blood flow: L-Arginine is a precursor to nitric oxide, a compound that helps relax blood vessels and improve circulation. Taking L-Arginine supplements can help promote healthy blood flow, which is essential for overall health and vitality.
2. Supports immune system function: L-Arginine has been shown to have immune-enhancing properties, as it helps stimulate the production of white blood cells and other immune cells. This can help improve the body's ability to fight off infections and illnesses, making it a beneficial supplement for overall immune system support.

The Key Ingredient Is: L-Arginine (L-Arginine)

L-Arginine is an amino acid that acts as a precursor for nitric oxide synthesis, contributing to normal vascular function and blood flow support.

This single-ingredient formula provides L-Arginine in supplement form, commonly used for general circulation and upkeep of vascular health in line with product design.

What L-Arginine Does?

L-Arginine is involved in producing nitric oxide, which helps relax blood vessels and supports normal blood flow.

Dr. Böger from the University of Düsseldorf found that L-arginine augments endogenous NO production, contributing to vasodilation. This mechanism aligns with supporting normal cardiovascular function as recognised in NHS and EFSA guidance.

This product isn't meant to diagnose, treat, cure, or prevent any disease.

Douglas Laboratories was picked for its solid manufacturing calibre and long-standing commitment to science-based formulations. With a track record spanning more than 65 years and a reputation for clinician-focused, evidence-informed products, the brand stands out in the industry for reliability and professional trust. This heritage, together with its ownership by Atrium Innovations (the group behind Pure Encapsulations and Genestra Brands), reinforces its standing as a trusted partner relied on by healthcare professionals.

In terms of quality, Douglas Laboratories runs GMP-compliant and NSF International registered facilities, with an ISO-17025 accredited in-house laboratory. Their products undergo thorough third-party testing for purity and potency, and select formulas carry NSF Certified for Sport status – a sign of their robust quality control and safety standards. This commitment aligns with Welzo’s expectations and our stringent our supplement quality standards.

For this L-Arginine formulation, the brand’s science-led approach makes it a natural fit, delivering a single-ingredient, well-characterised option that aligns with our focus on potency and clarity. This product matches the brand’s ethos of thorough testing and practitioner-ready formats, supporting informed recommendations from Welzo's healthcare professionals.

Welzo’s team evaluation process and vetting criteria stress manufacturer track record, quality controls and third-party verification. This brand meets those standards, and the blend of Douglas Laboratories’ heritage, manufacturing excellence and product integrity justified our choice for this partner-led, science-driven category.