Rule 1 Citrulline delivers pure, high-potency L-citrulline engineered to drive unyielding muscle pumps, enhance vascularity, and delay fatigue during intense training. Unflavoured and free from unnecessary fillers or additives, this versatile performance booster increases circulating arginine and nitric oxide levels far more effectively than arginine alone. Designed for dedicated athletes and active Kiwis looking to maximise blood flow, nutrient delivery, and endurance, Rule 1 Citrulline is a essential addition to any pre-workout stack.

Key Benefits & Features

• Skin-Splitting Muscle Pumps: Elevates plasma nitric oxide synthesis to expand blood vessels for superior vascularity and muscle volume.

• Enhances Muscular Endurance: Supports efficient waste removal, helping clear ammonia and metabolic by-products during high-rep sets.

• Superior Nitric Oxide Booster: Absorbs rapidly and converts efficiently into L-arginine, outperforming direct L-arginine supplementation.

• 100% Unflavoured & Versatile: Mixes effortlessly into your favourite pre-workout, pump complex, or intra-workout aminos without altering taste.

• Zero Stimulants or Fillers: Completely free from caffeine, artificial colours, sugars, and gums—just pure, high-grade L-citrulline.

How It Works

L-citrulline is a non-essential amino acid that plays a pivotal role in the body's nitric oxide (NO) pathway and urea cycle. Once consumed, L-citrulline bypasses early liver metabolism and is converted by the kidneys into L-arginine, which then acts as the direct precursor to nitric oxide production.

The resulting surge in nitric oxide dilates the endothelial lining of blood vessels, increasing total blood flow to active muscle tissue. This micro-circulation rush surges oxygen and essential nutrients directly to working muscles while accelerating the clearance of muscular toxins like lactic acid and ammonia. The result is improved work capacity, sustained power output, and dense, long-lasting muscle pumps.

Recommended Use

Mix 1 level scoop (approx. 2g) with 200–300ml of cold water, fruit juice, or your preferred pre-workout beverage in a Sprint Fit shaker. Consume 20–30 minutes prior to exercise. For maximum pump enhancement, combine with a full serving of your daily pre-workout or non-stimulant performance formula.

Container Size: 60 Serves
Serving Size: 1 Scoop
Servings Per Container: 60

HOW TO USE IT
Before/During Workouts
Citrulline is best consumed before or during workouts.

Mixing Directions 
Mix one (1) scoop with 8-12 oz. of your favorite cold beverage or liquid workout supplement. Consume before or during training.

Alternate Suggested Use 
Citrulline mixes easily into sports drinks, smoothies, and fruit juices.

We use NZ Couriers as our courier service using an international service. NZ Couriers provides our customers with fast and reliable delivery to destinations across their comprehensive AUS network. 

Standard orders over $60.00 receive free* shipping nationwide, excluding WA, NT, TAS.
Standard delivery starts from $12.90 per shipment for orders under $60.00 
Signature Required $14.90 per shipment. Please ensure you do not have the 'authority to leave' authorization set up at your address with NZ Couriers should you wish to use this service.
If you don't want NZ Couriers to leave your parcel unattended, please select the signature required option. This is especially recommended for high value orders. Neither NZ Couriers nor Sprint Fit are liable for parcels that are stolen, damaged or lost after an item has been delivered.

Final pick up each day is at 3.45pm Monday to Friday. 

*Excludes public holidays and weekends as courier is closed

Click here to view the full Shipping Details and Returns Policy.