Stim-Free Review
- Caffeine-free, take it any time
- Excellent performance support
- Solid pumps
- No meaningful energy boost
- Mental focus is fairly light
Effects Timeline
AI-estimated changes in effects over the first 3 hours after taking the recommended serving.
Stim-Free delivers genuinely strong performance and pump support without a single milligram of caffeine — a real option for anyone avoiding stimulants entirely or training late in the day.
As you'd expect, there's no real energy lift here, and mental focus is fairly modest too.
This is the caffeine-free sibling to Transparent Labs' Bulk and Bulk Black, both of which perform considerably higher across energy and focus if stimulants aren't a concern.
Honest take: A genuinely strong stim-free option, though it's priced like its caffeinated siblings.
Ingredient breakdown
Every dose · every gap| Ingredient | Clinically effective dose | Dose in Stim-Free | Status |
|---|---|---|---|
| Citrulline Malate | 6 g | 8 g | 100%Clinically effective |
| Beta Alanine | 4.5 g | 4 g | 89%Almost clinically effective |
| Betaine | 2.5 g | 2.5 g | 100%Clinically effective |
| Taurine | 2–3 g | 1.3 g | 65%Moderate dose |
| Tyrosine | 2–8 g | 1 g | 50%Under-dosed |
| ElevATP | 150 mg | 150 mg | 100%Clinically effective |
| Senactiv (Panax notoginseng + Rosa roxburghii) | 50 mg | 50 mg | 100%Clinically effective |
| Huperzine-A | 200 mcg | 100 mcg | 50%Under-dosed |
| Sodium (elemental, hydration) | 0.3–1 g | 0.15 g | Hydration support |
| Potassium (elemental) | 100–400 mg | 100 mg | Hydration support |
- Citrulline Malate8 g100%Clinically effective
- Beta Alanine4 g89%Almost clinically effective
- Betaine2.5 g100%Clinically effective
- Taurine1.3 g65%Moderate dose
- Tyrosine1 g50%Under-dosed
- ElevATP150 mg100%Clinically effective
- Senactiv (Panax notoginseng + Rosa roxburghii)50 mg100%Clinically effective
- Huperzine-A100 mcg50%Under-dosed
- Sodium (elemental, hydration)0.15 gHydration support
- Potassium (elemental)100 mgHydration support
Evidence references
Effect of Beta-Alanine Supplementation on Maximal Intensity Exercise in Trained Young Male Individuals: A Systematic Review and Meta-Analysis
Effects of Citrulline Malate Supplementation on Exercise Performance: A Systematic Review and Three-Level Meta-Analysis
Tyrosine for Mitigating Stress and Enhancing Performance in Healthy Adult Humans, a Rapid Evidence Assessment of the Literature
Does One Shot Work? The Acute Impact of a Single Taurine Dose on Exercise Performance: A Meta-Analytic Review
