Bulk Black Review
- Outstanding mental focus
- Excellent energy
- Strong performance support
- Pumps noticeably weaker than everything else
- High stimulant content overall
- Part of a 3-product lineup
Effects Timeline
AI-estimated changes in effects over the first 3 hours after taking the recommended serving.
Bulk Black stands out most for mental focus, with excellent energy and performance right behind it — a formula built for feeling dialed in as much as powered up.
Pumps are the clear weak point, so it's not the pick if a strong muscle pump is the priority.
Transparent Labs also sells a caffeine-free Stim-Free version and a lower-caffeine Bulk version, the latter of which actually edges out Bulk Black on pumps and performance specifically.
Honest take: A real step up from Transparent Labs' base formula, and worth the extra cost if focus matters to you.
Ingredient breakdown
Every dose · every gap| Ingredient | Clinically effective dose | Dose in Bulk Black | 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 |
| Tyrosine | 2–8 g | 2 g | 100%Clinically effective |
| Caffeine (actual caffeine) | 200–400 mg | 325 mg | 100%Clinically effective |
| Alpha-GPC Choline | 600 mg | 150 mg | 25%Under-dosed |
| Theanine | 200–400 mg | 200 mg | 100%Clinically effective |
| Huperzine-A | 200 mcg | 200 mcg | 100%Clinically effective |
| Sodium (elemental, hydration) | 0.3–1 g | 0.18 g | Hydration support |
| Potassium (elemental) | 100–400 mg | 130 mg | Hydration support |
| Senactiv (Panax notoginseng + Rosa roxburghii) | 50 mg | 50 mg | 100%Clinically effective |
- Citrulline Malate8 g100%Clinically effective
- Beta Alanine4 g89%Almost clinically effective
- Betaine2.5 g100%Clinically effective
- Tyrosine2 g100%Clinically effective
- Caffeine (actual caffeine)325 mg100%Clinically effective
- Alpha-GPC Choline150 mg25%Under-dosed
- Theanine200 mg100%Clinically effective
- Huperzine-A200 mcg100%Clinically effective
- Sodium (elemental, hydration)0.18 gHydration support
- Potassium (elemental)130 mgHydration support
- Senactiv (Panax notoginseng + Rosa roxburghii)50 mg100%Clinically effective
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
Alpha-GPC and power output
Effects of Caffeine Intake on Endurance Running Performance and Time to Exhaustion: A Systematic Review and Meta-Analysis
