Pump Serum
vs Transparent Labs Stim-Free Pre-Workout
Ingredient & Score Comparison
Last updated: Feb 2026
PwrRanks Verdict
Score Comparison
Objective scores based on ingredient dosing — 0 to 1 scale
Pump Serum's formula has 10g L-Citrulline and 4g Glycerol, which contribute to a higher pump score.
Pump Serum's formula has 3g L-Tyrosine, which contributes to a higher focus score.
Transparent Labs Stim-Free Pre-Workout delivers more performance per dollar than Pump Serum — based on how both products compare to the broader pre-workout market.
Ingredient Comparison
Pump Serum vs Transparent Labs Stim-Free — dosing per serving
| Ingredient | Objective | Pump Serum | Transparent Labs Stim-Free |
|---|---|---|---|
| L-Citrulline | Pump | 10g | — |
| L-Citrulline Malate | Pump | — | 8g |
| Glycerol | Pump | 4g | — |
| Betaine Anhydrous | Pump | 3g | 2.5g |
| Arginine Nitrate | Pump | 3g | — |
| Taurine | Pump | 3g | 1.3g |
| Agmatine | Pump | 1.5g | — |
| Casein Hydrolysate | Pump | 254mg | — |
| L-Tyrosine | Focus | 3g | 1g |
| Huperzine | Focus | — | 100mcg |
| Beta-Alanine | - | 6.4g | 4g |
| ElevATP | - | — | 150mg |
| Senactiv | - | — | 50mg |
| Black Pepper Extract | - | 10mg | 5mg |
Who Should Buy Each
Matching products to training goals and stim tolerance
Choose Pump Serum If…
- ✓You enjoy hydration-based pump ingredients that give a swollen and full look during training
Choose Transparent Labs Stim-Free If…
- ✓You want sharp mental focus that lasts through the full session
Frequently Asked Questions
Common questions about these two pre-workouts
Both are low-stim or stimulant-free (0mcg or less per serving).
More Comparisons
How PwrRanks Scores Pre-Workouts
Our methodology
PwrRanks scores every pre-workout by analyzing its ingredient label algorithmically. We generate four objective scores — Energy, Pump, Focus, and Value — that reflect what's in the tub, not how the product is marketed. Value scores are calculated using live pricing data to reflect real cost-per-serving at time of comparison.