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  3. Citrulline vs Theanine

Citrulline vs Theanine

TL;DR

Quick comparison: Citrulline and Theanine have 0 overlapping categories and appear together in 7 products.

  • •Choose Citrulline if: L-Citrulline is a non-essential amino acid named after watermelon (Citrullus lan...
  • •Choose Theanine if: L-Theanine promotes relaxation without drowsiness, reduces stress, and improves ...
  • •Take both if: You want comprehensive coverage across 0 shared categories.
564 products
analyzed in our comprehensive supplement database
Source: MoodStack Database (2026)

Side-by-Side Comparison

FeatureCitrullineTheanine
Typeamino_acidamino_acid
Common Dosage3-8 g daily (citrulline malate: 6-8 g)200 mg
Best BioavailabilityL-Citrulline (88%)L-Theanine (90%)
Categories24
Available Products00

Citrulline

Typeamino_acid
Common Dosage3-8 g daily (citrulline malate: 6-8 g)
Best BioavailabilityL-Citrulline (88%)
Categories2
Available Products0

Theanine

Typeamino_acid
Common Dosage200 mg
Best BioavailabilityL-Theanine (90%)
Categories4
Available Products0

Can You Take Both?

Yes, Citrulline and Theanine can typically be taken together. In fact, we found 7 products in our database that contain both supplements, suggesting they complement each other well.

Key Differences

Citrulline

L-Citrulline is a non-essential amino acid named after watermelon (Citrullus lanatus). It is converted to L-arginine in the kidneys, making it a more efficient NO booster than arginine itself (arginine undergoes significant first-pass metabolism). One of the most validated pre-workout ingredients for blood flow and endurance.

Categories:

Muscle GainEndurance

Common Forms:

  • • L-Citrulline (88% bioavailability)
  • • Citrulline Malate (L-Citrulline DL-Malate) (85% bioavailability)

Theanine

L-Theanine promotes relaxation without drowsiness, reduces stress, and improves focus when paired with caffeine. It supports sleep quality and enhances alpha brain wave activity. Found in green tea and supplements.

Categories:

Fat LossSleepFocus & CognitionStress & Mood

Common Forms:

  • • L-Theanine (90% bioavailability)

Products Containing Both Citrulline and Theanine

We found 7 products that combine both supplements:

Transparent Labs BULK Pre-Workout

Transparent Labs BULK Pre-Workout

Transparent Labs

$49.99Score: 93/100
Transparent Labs BULK Black Pre-Workout

Transparent Labs BULK Black Pre-Workout

Transparent Labs

$54.99Score: 88/100
WORK! - PreWorkout

WORK! - PreWorkout

Raptor Nutrition

$48Score: 88/100
Transparent Labs LEAN Pre-Workout

Transparent Labs LEAN Pre-Workout

Transparent Labs

$49.99Score: 87/100
Pre-Workout+

Pre-Workout+

Alani Nu

$44.99Score: 80/100
Pre-Workout

Pre-Workout

Alani Nu

$39.99Score: 80/100
Thavage Pre-Workout

Thavage Pre-Workout

RAW Nutrition

$45Score: 69/100

Frequently Asked Questions

What is the difference between Citrulline and Theanine?

Citrulline and Theanine are both important supplements with distinct properties. Citrulline L-Citrulline is a non-essential amino acid named after watermelon (Citrullus lanatus). It is converted to L-arginine in the kidneys, making it a more efficient NO booster than arginine itself (arginine undergoes significant first-pass metabolism). One of the most validated pre-workout ingredients for blood flow and endurance., while Theanine L-Theanine promotes relaxation without drowsiness, reduces stress, and improves focus when paired with caffeine. It supports sleep quality and enhances alpha brain wave activity. Found in green tea and supplements..

Can I take Citrulline and Theanine together?

Based on our analysis of 7 products that contain both, yes, Citrulline and Theanine can typically be taken together. However, always consult with a healthcare provider before combining supplements.

Which is more popular: Citrulline or Theanine?

In our database of 564 products, Citrulline appears in 25 products, while Theanine appears in 26 products.

Related Comparisons & Products

What is Citrulline?What is Theanine?Vitamin B6 vs TheanineTheanine vs ValerianCreatine Monohydrate vs CitrullineTransparent Labs BULK Pre-Workout (contains both)WORK! - PreWorkout (contains both)Transparent Labs BULK Black Pre-Workout (contains both)

Medical Disclaimer: This content is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before starting any supplement regimen.