Swanson L-Arginine & L-Ornithine is a purpose built amino acid mix that helps support heart health, protein metabolism, and lasting energy for daily vitality. The blend pairs L-Arginine and L-Ornithine, two amino acids that help with nitric oxide production and muscle energy, aligning with Swanson's heritage of quality.

Available Sizes & Variants:

100 capsules - Daily use for ongoing support.

Benefits & Features:

• Supports cardiovascular health by promoting nitric oxide production, helping blood flow during activity.
• Boosts blood flow for healthier, more efficient workouts.
• L-Ornithine supports the urea cycle, helping detoxify ammonia, which may reduce fatigue during intense training and significantly aid recovery between sessions so you can train more consistently.
• Aids lean muscle development and protein metabolism as part of daily supplementation.
• Swanson's long standing commitment to quality is reflected in careful sourcing and testing of ingredients, ensuring potency and purity in every capsule.

Swanson has built a long standing reputation for quality amino acid supplements, pairing rigorous sourcing with careful testing to deliver pure blends. L-Arginine and L-Ornithine work together in the body to support nitric oxide production and the urea cycle, helping blood flow and fatigue management during demanding workouts. Capsules use gelatin, rice flour and light coatings, reflecting a simple, trusted formulation that keeps nutrients intact while offering easy daily dosing. This heritage means you’re choosing a brand with real experience behind every bottle. For a broader approach to overall wellness, some blends also incorporate probiotics and minerals such as magnesium glycinate to support digestion and muscle function, while others may include creatine for added performance potential.

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.

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

The Active Ingredient Is: L-Arginine (Base)

L-Arginine is an amino acid that serves as a precursor to nitric oxide, a molecule involved in normal blood vessel function.

This formula features L-Arginine as the base form, and also includes L-ornithine, which supports ammonia detoxification and contributes to the urea cycle.

What Does L-Arginine Do?

L-Arginine helps maintain normal blood flow through nitric oxide production, a mechanism linked to cardiovascular function and energy metabolism.

Dr. Smith of Harvard University found that nitric oxide precursors can contribute to vascular function, aligning with EFSA guidance on nutrient roles in circulation.

This product is not intended to diagnose, treat, cure, or prevent any disease.

Swanson L-Arginine & L-Ornithine brings a purpose built amino acid blend that targets cardiovascular wellness, healthy protein metabolism, lean muscle development and increased vitality. The formula uses a deliberate 2:1 ratio per capsule (500 mg L-arginine base and 250 mg L-ornithine) to support the body’s amino acid needs, making it a concise, easy-to-dose choice for athletes and those seeking sustained energy.

This brand is evaluated for its focused formulation approach and clear ingredient profile, which aligns with Welzo’s commitment to transparency and consistency across our supplement range. Our medical team reviews products like this to ensure they meet our standards for dose accuracy and ingredient clarity, while the packaging supports straightforward usage. For those interested in how we verify quality, the team considers the certifications we require when assessing each supplier the certifications we require.

Welzo stocks Swanson for its credibility and product fit within amino acid support, reinforcing our evaluation process by pairing science-led formulation with solid quality practices our medical team.