L-Citrulline from Double Wood Supplements helps support nitric oxide production, boosting blood flow and endurance so you can train harder and recover quicker.

The key ingredient raises L-Arginine levels to sustain circulation, while the product is made in the United States and is non-GMO, gluten-free and soy-free.

This brand stresses quality with strict third party testing for purity and potency, which keeps you informed.

Benefits & Features:

• Supports nitric oxide levels for improved blood flow, which helps you train longer and feel more sustainable, day after day.
• This star ingredient raises L-Arginine levels to boost nitric oxide, which supports sustained blood flow and oxygen delivery to muscles, helping you train longer and feel less fatigued.
• Designed for daily use, supporting consistent training without unnecessary interruptions ever.
• Made in the USA with non-GMO, gluten-free and soy-free ingredients.
• Quality you can trust with transparency about manufacturing and testing.

Double Wood emphasises quality, safety and careful sourcing. The product is manufactured in the USA, non-GMO, gluten-free and soy-free, with rigorous third-party testing for purity and potency. L-Citrulline raises L-Arginine to support nitric oxide production, helping blood flow, endurance and recovery during workouts. It’s a straightforward, single ingredient formula you can trust in a crowded market. No unnecessary fillers, just pure performance support. For athletes seeking enhanced performance, this sports nutrition supplement line complements creatine and supports nitric oxide and endurance in training.

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-Citrulline

L-Citrulline is an amino acid that supports the body's production of nitric oxide, contributing to normal blood flow and circulatory health.

This form is supplied as L-Citrulline, a single-ingredient amino acid used in dietary supplements to support athletic performance and circulatory function. The product is manufactured in the USA and is non-GMO, gluten-free, and soy-free.

What Does L-Citrulline Do?

L-Citrulline increases blood levels of L-Arginine, which directly supports nitric oxide synthesis to help maintain efficient circulation and endurance during activity. This mechanism can contribute to improved energy production and reduced fatigue during sustained exercise, in line with scientific findings from researchers at the University of Granada.

Dr. Perez-Guisado of the University of Granada found that L-Citrulline may support vascular health and exercise performance through the arginine–NO pathway, highlighting its role in normal muscular and circulatory function.

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

Double Wood Supplements stands out in our evaluation for its clear dedication to quality, transparency and American manufacturing. This brand is recognised for producing L-Citrulline in the USA and prioritising non-GMO, gluten-free and soy-free formulations, which aligns with Welzo’s commitment to purity and potency. Our team of medical experts reviewed Double Wood within the framework of our quality standards, emphasising rigorous third-party testing for purity and potency and a straightforward, consumer-friendly sourcing story. You can learn more about our evaluation process and the exact criteria used by our experts our team of medical experts and our quality certification process.

This brand’s heritage of transparent manufacturing and a focus on safe, clean ingredients made them a natural fit for a single-ingredient supplement like L-Citrulline. The product aligns well with Welzo’s product fit criteria, and our vetting panel selected Double Wood for its demonstrated commitment to quality, safety and consistency. This partnership is grounded in our structured evaluation approach and a shared emphasis on reliable supply and consumer trust.