Rule 1 Citrulline
Description
Rule 1 Citrulline is pure L-citrulline with nothing else added. Citrulline contributes to nitric oxide synthesis, which is the pathway behind muscle pumps and blood flow during training, making it one of the most common foundational additions to a serious lifter's stack.
This is part of Rule 1's Foundation Series, a line of single-ingredient powders built to stand alone or stack into whatever you are already taking. There are no flavors, sweeteners, or fillers, so each scoop drops cleanly into a pre-workout, a protein shake, or plain water without changing how it tastes or clumping up.
At 60 servings per container, it is a straightforward way to add citrulline to your routine and dial the dose yourself rather than accepting whatever amount a blended pre-workout happens to include.
Key Benefits
- 100% pure L-citrulline, no flavors, sweeteners, or fillers
- Supports nitric oxide synthesis, muscle pumps, and endurance
- 60 servings per container
- Unflavored and mixes clean into any beverage or supplement
- Stackable with pre-workouts, protein, and other Foundation Series powders
- Made in the USA in GMP-certified facilities
Formula Highlights
- Pure L-Citrulline
- No added flavors or sweeteners
- No fillers
- Unflavored
How To Use
Mix one scoop with 8 to 12 oz of your favorite cold beverage or liquid workout supplement. Consume before or during training. It also mixes easily into sports drinks, smoothies, and fruit juices.
Frequently Asked Questions
What is the difference between L-citrulline and citrulline malate?
This product is pure L-citrulline. Citrulline malate binds citrulline to malic acid, so a gram of citrulline malate delivers less actual citrulline than a gram of pure L-citrulline.
When should I take it?
Before or during training is the usual timing, since that lines up with when pump and blood flow support matters most.
Can I stack it with a pre-workout?
Yes. It is unflavored and designed to be added to whatever you already use, which lets you top up the citrulline dose in a pre-workout that is light on it.
Does it contain caffeine?
No. Citrulline is stimulant free, so it can be used at any time of day.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.