L-Ornithine helps your stress response stay balanced and nitrogen balance stay steady, with L-Ornithine as the core amino acid in the urea cycle, backed by Swanson’s trusted quality. Made in the United States to Swanson’s Good Manufacturing Practices standards and suitable for vegetarians. This vitamin d supplement is a natural addition for daily resilience.

Available Sizes & Variants:

60 Veg capsules – convenient vegetarian capsules handy for daily use.

Benefits & Features:

• Supports a balanced stress response by helping eliminate excess nitrogen.
• May ease fatigue and daily stress.
• L-ornithine acts as an arginine precursor, helping balance amino acids and support recovery.
• May support sleep quality and mood in healthy adults, reflecting ornithine’s broader role in stress management and recovery during busy days for daily resilience.
• By supporting the urea cycle, L-ornithine helps convert ammonia to urea for safe excretion, aiding nitrogen balance during heavy training.

Swanson has offered science backed supplements since 1969, and this L-Ornithine formula stays true to that heritage. The star ingredient is L-ornithine, provided in its free form as L-ornithine hydrochloride, and the capsules are vegetarian. Made in the United States to Good Manufacturing Practices standards, the product is built for daily resilience under life’s pressures. It’s a simple, no nonsense formula, basically straightforward – no fluff, just dependable support from a brand you can trust. For those following broader wellness routines, this amino acid supplements option complements other core nutrients, and some customers even seek it alongside Liver King inspired regimens.

Other Ingredients - Hypromellose (vegetable capsule), Microcrystalline cellulose (plant fiber), Magnesium stearate
Free From - Suitable for Vegetarians

• GTIN: 87614112381
• Manufacturer: Swanson
• Categories: Best SellersNew ArrivalsOrnithine SupplementsSubscribe & Save ProductsSwanson
• 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 one capsule twice daily with water between meals.

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

The Active Ingredient Is: L-Ornithine (L-Ornithine HCl Form)

L-Ornithine is an amino acid involved in the urea cycle, helping to regulate nitrogen balance and supporting arginine synthesis. This form is provided as free-form L-Ornithine HCl in a vegetarian capsule.

What Does L-Ornithine Do?

L-Ornithine is involved in the urea cycle, which aids in converting excess nitrogen to urea for elimination and supports detoxification processes. It is associated with a healthy stress response and amino acid balance, with evidence from scientific reviews and EFSA-aligned nutrition guidance. Dr. Kuriyama of a leading university found that L-Ornithine supplementation reduced fatigue and stress in healthy adults.

This section highlights how L-Ornithine participates in normal metabolic processes and supports overall nitrogen management and stamina in everyday contexts.

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

Food supplements should not be used as a substitute for a varied diet. Do not exceed the stated dosage. Store in a cool, dry place, protected from light and heat. Keep out of sight and reach of children.

Swanson is our chosen partner for Swanson L-Ornithine because of a long-standing commitment to science-backed supplements and consistently reliable quality since 1969. This heritage gives us confidence in their ability to deliver predictable, well‑made products that fitness and health communities trust for value and effectiveness. The brand’s manufacturing philosophy emphasises controlled quality, with production in the United States and adherence to Good Manufacturing Practices, which underpins a rigorous approach to purity and potency. Swanson maintains robust internal quality control and is regularly assessed by trusted third parties, reinforcing its reputation for dependable supplements.

For this L-Ornithine product, Swanson’s focus on clear ingredient sourcing and vegetarian capsules aligns with our emphasis on formulation transparency and suitability for a vegetarian lifestyle, supporting nitrogen balance in a safe, well‑documented manner. This brand stood out during our evaluation for its reliability, measurable quality processes, and proven track record. This brand was evaluated by Welzo's healthcare professionals for compliance with our quality certification process, ensuring we prioritise safety and consistency for you.