L-Citrulline Core Series gives your nitric oxide a nudge to boost blood flow and help you push through with better pumps and longer stamina during training sessions. This tub is built to perform, and it pairs well with other essentials you already use for workouts.

Available Sizes & Variants:

234 grams L-Citrulline Core Series - handy daily tub for training

Benefits & Features:

• Strong pumps during workouts are supported by this formula.
• GlycerSize hydration supports cell volume and endurance, helping you stay hydrated and push through longer training sessions with steadier energy, even on tough cardio days.
• Daily use is straightforward with a single daily scoop.
• L-Citrulline drives real performance support.
• Quality is controlled in a GMP certified facility to ensure purity and safety.

5% Nutrition built its reputation on straight talking, quality driven supplements for serious athletes. This L-Citrulline Core Series is manufactured in American facilities to strict GMP standards and third party tested for purity. The combination of 3,000 mg L-Citrulline per serving and the GlycerSize hydration helps you maintain performance during hard sessions. It's a go-to in the 5% lineup, trusted by pros and everyday gym-goers alike, and pairs nicely with creatine, a protein powder, or a vitamin d supplement.

L-Citrulline, Glycerol Powder (65% Glycerol) (GlycerSize), L-Citrulline, Glycerol Powder (65% Glycerol) (GlycerSize)

• GTIN: 850006755646
• Manufacturer: 5% Nutrition
• Categories: 5% NutritionCitrulline SupplementsEnergy Vitamins, Supplements & Tablets SupplementsMuscle Pump Supplements & Pre WorkoutNitric Oxide Boosters SupplementsSports SupplementsStamina & Endurance Supplements
• 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.

Mix 1 scoop (3.9 g) with water or your favourite beverage and consume once a day. Store in a cool, dry place away from sunlight and with the lid tightly secured. Not intended for persons under the age of 18. Consult your healthcare professional prior to use if you have or suspect a medical condition, are taking prescription drugs, or are pregnant or breastfeeding. Keep out of reach of children.

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

*Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

The Active Ingredient Is: L-Citrulline

L-Citrulline is an amino acid that functions as a building block for nitric oxide, helping normal blood flow and cellular hydration. This blend pairs L-Citrulline with glycerol to boost hydration and endurance during workouts.

This form uses basic L-Citrulline found in supplements and is paired with GlycerSize glycerol powder to back hydration in the system.

What Does L-Citrulline Do?

L-Citrulline helps drum up nitric oxide production, a compound involved in promoting blood flow and muscle oxygen delivery during exercise. This supports normal circulatory function and can add to your exercise performance. Dr. Gonzalez from the university noted that L-Citrulline boosts nitric oxide production, aiding blood flow.

The glycerol component helps cellular hydration to support endurance during activity.

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

5% Nutrition is Welzo.selected because of a proven commitment to premium, performance-focused supplementation and a clear science-driven approach. This brand, founded and popularised within the bodybuilding community, is widely recognised for transparency, elite ingredient choices and a reputation that resonates with serious athletes. 5% Nutrition maintains rigorous quality standards and a manufacturing philosophy that centre on reliability and potency.

The manufacturer operates in a GMP-certified facility and emphasises American manufacturing alongside third-party testing for purity and safety, reinforcing trust in product quality. This dedication to quality is complemented by a clear focus on formulating effective, back-to-basics supplements that support performance and hydration needs.

For this L-Citrulline product, 5% Nutrition’s track record of precise ingredient selection and robust quality processes aligns with Welzo’s evaluation criteria. This brand was evaluated by Welzo's healthcare professionals for compliance with how we verify ingredient quality, and our team recognised its suitability for the British market. The result is a trusted partnership that pairs brand integrity with product relevance.