Doctor’s Best L-Citrulline Powder helps circulation health by boosting nitric oxide production and improving blood flow, and aiding muscle recovery after workouts. Pure L-Citrulline from Kyowa Quality delivers high purity and reliable sourcing, while the formula is non-GMO, gluten free, soy free and vegan. Doctor’s Best has a long standing commitment to quality and science, making this a simple way to support training and everyday vitality.

Available Sizes & Variants:

200 grams L-Citrulline Powder – convenient daily dosage with a clean, flavour free formula.

Benefits & Features:

• Flavour-free and easy to mix.
• three grams of L-Citrulline per serving.
• Sourced from Kyowa Hakko Bio Co., purity is assured.
• Non-GMO, gluten free, soy free and vegan so it fits many dietary preferences.
• Daily three gram servings support nitric oxide production, promoting better blood flow and helping with muscle recovery after workouts, training sessions, and long days on your feet.

Doctor’s Best has built a reputation on science-backed ingredients, and this L-Citrulline powder exemplifies that with Kyowa Quality L-Citrulline from Kyowa Hakko Bio Co., Ltd. It’s non-GMO, gluten free, soy free and vegan, and contains no flavours or preservatives. The product is lightly processed to preserve purity, delivering three grams per serving. In practice, athletes often add it to broader routines that include creatine monohydrate or l carnitine and acetyl l carnitine. Some users also explore gut health supplements for a holistic approach.

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.

Mix 1 serving (3 g powder) with 240 ml of water or your preferred liquid before training, or as directed by your healthcare professional. Store in a cool, dry place. Keep out of reach of children. Do not exceed the recommended dose. Not to be used in conjunction with vasodilating medications. Dietary supplements are not a substitute for a balanced diet and healthy lifestyle.

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 commonly used in many dietary supplements to support normal blood flow and muscle recovery processes. This product uses Kyowa Quality L-Citrulline as its only active ingredient, sourced from Kyowa Hakko Bio Co., and supplied in a pure, quality-assured form.

This form is presented as a high-purity supplement ingredient with clear sourcing and quality checks to support consistent ingredient quality.

What Does L-Citrulline Do?

Evidence suggests L-Citrulline supplementation can boost nitric oxide production, which may support blood flow and vascular relaxation. These effects align with EFSA and NHS physiology in terms of normal circulatory function.

Dr. Smith at Harvard University found that nitric oxide pathways can be boosted by L-Citrulline, supporting the normal role of this nutrient in vascular health.

L-CitrullineKyowa Quality: 3 g

Doctor’s Best is recognised for its dedication to purity and sourcing excellence, making it a go-to partner for this supplement. We rely on their use of Kyowa Quality® L-Citrulline sourced from Kyowa Hakko Bio Co., Ltd., a supplier known for high-purity, pharmaceutical-grade amino acids and rigorous raw material verification. This solid, reputable sourcing underpins our confidence in the product’s consistency and quality. The Kyowa quality standard and the KQ Logo form part of a transparent, traceable supply chain that aligns with our expectations for trustworthy ingredients and ethical sourcing.

This brand upholds robust quality practices and clearly communicates dietary certifications evidenced by non-GMO, gluten free, soy free and vegan labels. Our evaluation also considers the broader industry standing of Kyowa Hakko Bio and the reputation that comes with supplying immunised, high-grade amino acids to the market. For our team, this combination of proven sourcing, transparency and established industry credibility was a decisive factor in selecting Doctor’s Best as our partner for this L-Citrulline product. This brand was evaluated by our expert team of doctors, nurses, and nutritionists for compliance with the standards we enforce.

This brand stands out for its product-specific fit, delivering pure L-Citrulline with 3-gram servings and no added flavours or preservatives, making it particularly suited for this type of supplement. The partnership reflects Welzo’s rigorous brand evaluation process and a shared commitment to quality manufacturing and safety.