Transparent Labs BULK Black Pre-Workout
The transparency benchmark. BULK Black pairs one of the most fully disclosed high-stim labels in the category with strong clinical doses—8g citrulline malate, 4g beta-alanine, 2.5g betaine, and 325mg caffeine—backed by public third-party purity reports.
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Our Verdict
One of the most transparent high-stim labels in the category paired with strong clinical doses—8g citrulline malate, 4g beta-alanine, 2.5g betaine, 325mg caffeine—plus public third-party purity reports. Strong value at ~$1.83/serving.
Score Breakdown
Pros & Cons
Pros
- •Fully disclosed, no proprietary blends
- •Strong clinical doses across the board
- •Public third-party purity reports
- •Nootropics (alpha-GPC, theanine, tyrosine)
- •Strong value at the quality tier (~$1.83/serving)
Cons
- •High-stim (325mg caffeine)
- •Beta-alanine tingling
- •No current iHerb listing found
- •Leaves little room for other daily caffeine
Specifications
| Caffeine | 325mg |
| Citrulline Malate | 8g |
| Beta-Alanine | 4g |
| Betaine | 2.5g |
| Alpha-GPC | 300mg |
| L-Theanine | 200mg |
| Servings | 30 |
Who Is This For?
Best For
- Label-transparency fans
- Stim-tolerant lifters
- Those wanting full clinical doses
Not For
- Stim-sensitive users
- Those avoiding beta-alanine tingles
- Budget shoppers
Where to Buy
Appears In
Customer Reviews
Alternatives to Consider
Kaged Pre-Workout Elite
Kaged
The aggressively dosed all-in-one. Pre-Workout Elite packs 10g L-citrulline, 5g creatine, 3.2g beta-alanine, 2.5g betaine, and 388mg caffeine in a single serving—and every batch is Informed Sport tested for banned substances and heavy metals.
Legion Pulse Pre-Workout
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The best-balanced, evidence-led pick. Pulse centers on 8g citrulline malate, 3.6g beta-alanine, 2.5g betaine, and 350mg caffeine with a 1:1 caffeine-to-theanine focus ratio—plus Labdoor certification, published COAs, and NSF-certified cGMP manufacturing.
JYM Supplement Science Pre JYM
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The full-spectrum 'kitchen sink' formula. Pre JYM discloses 6g citrulline malate, 6g BCAAs, 2g creatine HCl, 2g beta-alanine, 1.5g betaine, 500mg beet root, and 300mg caffeine—uniquely bundling creatine and dietary nitrate support into one serving at a strong ~$1.67/serving.
PEScience Prolific Pre-Workout
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The cleanest tingle-free pick. At its full 2-scoop serving, Prolific delivers 6g citrulline, 2.5g betaine, 320mg caffeine, 200mg theanine, and 250mg citicoline with no beta-alanine—a coherent energy/focus/pump formula backed by published finished-product COAs.