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  3. Caffeine vs Citrulline

Caffeine vs Citrulline

TL;DR

Quick comparison: Caffeine and Citrulline have 1 overlapping categories and appear together in 17 products.

  • •Choose Caffeine if: Caffeine boosts alertness and focus by stimulating the central nervous system, e...
  • •Choose Citrulline if: L-Citrulline is a non-essential amino acid named after watermelon (Citrullus lan...
  • •Take both if: You want comprehensive coverage across 1 shared categories.
564 products
analyzed in our comprehensive supplement database
Source: MoodStack Database (2026)

Side-by-Side Comparison

FeatureCaffeineCitrulline
Typealkaloidamino_acid
Common DosageN/A3-8 g daily (citrulline malate: 6-8 g)
Best BioavailabilityCaffeine Anhydrous (99%)L-Citrulline (88%)
Categories32
Available Products00

Caffeine

Typealkaloid
Common DosageN/A
Best BioavailabilityCaffeine Anhydrous (99%)
Categories3
Available Products0

Citrulline

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

Can You Take Both?

Yes, Caffeine and Citrulline can typically be taken together. In fact, we found 17 products in our database that contain both supplements, suggesting they complement each other well.

Both supplements share 1 common category, indicating they may work synergistically for similar health goals.

Key Differences

Caffeine

Caffeine boosts alertness and focus by stimulating the central nervous system, enhances physical performance, and may improve mood. It supports metabolism and fat burning, potentially aiding weight management. Coffee, tea, and energy drinks are common sources.

Categories:

Fat LossEnduranceFocus & Cognition

Common Forms:

  • • Caffeine Anhydrous (99% bioavailability)
  • • Di-Caffeine Malate (95% bioavailability)
  • • Caffeine (as Green Coffee Bean Extract) (70% bioavailability)

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)

Shared Categories

Both Caffeine and Citrulline are used for these health goals:

🏃‍♂️Endurance

Products Containing Both Caffeine and Citrulline

We found 12 products that combine both supplements:

Transparent Labs BULK Pre-Workout

Transparent Labs BULK Pre-Workout

Transparent Labs

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

Transparent Labs BULK Pre-Workout

Transparent Labs

$49.99Score: 93/100
Gorilla Mode Lightning

Gorilla Mode Lightning

Gorilla Mind

$64.99Score: 91/100
Optimum Nutrition Gold Standard Pre-Workout Advanced

Optimum Nutrition Gold Standard Pre-Workout Advanced

Optimum Nutrition

$39.99Score: 90/100
Transparent Labs BULK Black Pre-Workout

Transparent Labs BULK Black Pre-Workout

Transparent Labs

$54.99Score: 88/100
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
Gorilla Mode Base Pre-Workout

Gorilla Mode Base Pre-Workout

Gorilla Mind

$21.99Score: 87/100
Transparent Labs LEAN Pre-Workout

Transparent Labs LEAN Pre-Workout

Transparent Labs

$49.99Score: 87/100
Transparent Labs LEAN Pre-Workout

Transparent Labs LEAN Pre-Workout

Transparent Labs

$49.99Score: 87/100
Gorilla Mode Pre-Workout

Gorilla Mode Pre-Workout

Gorilla Mind

$59.99Score: 86/100

Mypre 2.0

Myprotein

$27.99Score: 84/100

Frequently Asked Questions

What is the difference between Caffeine and Citrulline?

Caffeine and Citrulline are both important supplements with distinct properties. Caffeine Caffeine boosts alertness and focus by stimulating the central nervous system, enhances physical performance, and may improve mood. It supports metabolism and fat burning, potentially aiding weight management. Coffee, tea, and energy drinks are common sources., while 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..

Can I take Caffeine and Citrulline together?

Based on our analysis of 17 products that contain both, yes, Caffeine and Citrulline can typically be taken together. However, always consult with a healthcare provider before combining supplements.

Which is more popular: Caffeine or Citrulline?

In our database of 564 products, Caffeine appears in 49 products, while Citrulline appears in 25 products.

Related Comparisons & Products

What is Caffeine?What is Citrulline?Creatine Monohydrate vs CitrullineSodium vs CitrullineBetaine vs CitrullineTransparent Labs BULK Pre-Workout (contains both)Transparent Labs BULK Pre-Workout (contains both)Gorilla Mode Lightning (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.