Transparent Labs BULK Black Pre-Workout vs JYM Supplement Science Pre JYM
Transparent Labs BULK Black Pre-Workout (#1, best overall) vs JYM Supplement Science Pre JYM (#4, best value): in our Pre-Workout Supplements scoring the Transparent Labs BULK Black Pre-Workout totals 9.3/10 and the JYM Supplement Science Pre JYM 7.8/10.
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TopsFive comparison scores
Side by side
| Transparent Labs BULK Black Pre-Workout | JYM Supplement Science Pre JYM | |
|---|---|---|
| Price | $54.99 | $53.99 |
| Caffeine | 325mg | 300mg |
| Citrulline Malate | 8g | 6g |
| Beta-Alanine | 4g | 2g |
| Betaine | 2.5g | 1.5g |
| Alpha-GPC | 300mg | — |
| L-Theanine | 200mg | — |
| Servings | 30 | 30 |
| BCAAs | — | 6g |
| Creatine HCl | — | 2g |
| Beet Root | — | 500mg |
How they differ in real use
Built from our pre workout scoring, each product's published specifications, and verified owner feedback — not hands-on testing.
Both the Transparent Labs BULK Black Pre-Workout and the JYM Supplement Science Pre JYM made our Top 5 Pre-Workout Supplements, at #1 (best overall) and #4 (best value). 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. The most complete 'kitchen sink' formula—uniquely bundles creatine and beet-root nitrates with citrulline, beta-alanine, and betaine at a strong ~$1.67/serving. Beta-alanine is light (2g) and it carries a Prop 65 warning.
We score pre-workout supplements on Ingredient Dosing (35%), Energy & Focus (25%), Third-Party Testing (20%), Taste (10%) and Value (10%). On that basis the Transparent Labs BULK Black Pre-Workout totals 9.3 out of 10 and the JYM Supplement Science Pre JYM 7.8. The widest gap is Ingredient Dosing, where the Transparent Labs BULK Black Pre-Workout scores 10 against 8 for the JYM Supplement Science Pre JYM — clinical doses. Third-Party Testing also separates them: 9 for the Transparent Labs BULK Black Pre-Workout versus 6 for the JYM Supplement Science Pre JYM. The JYM Supplement Science Pre JYM claws back ground on Value.
On paper, the specifications that actually differ: Caffeine — 325mg on the Transparent Labs BULK Black Pre-Workout versus 300mg on the JYM Supplement Science Pre JYM; Citrulline Malate — 8g on the Transparent Labs BULK Black Pre-Workout versus 6g on the JYM Supplement Science Pre JYM; Beta-Alanine — 4g on the Transparent Labs BULK Black Pre-Workout versus 2g on the JYM Supplement Science Pre JYM; Betaine — 2.5g on the Transparent Labs BULK Black Pre-Workout versus 1.5g on the JYM Supplement Science Pre JYM. They match on Servings.
Pricing as of June 28, 2026: $54.99 for the Transparent Labs BULK Black Pre-Workout and $53.99 for the JYM Supplement Science Pre JYM, a $1 difference in the JYM Supplement Science Pre JYM's favor. Owners praise the Transparent Labs BULK Black Pre-Workout for fully disclosed, no proprietary blends and strong clinical doses across the board; the most common complaint is high-stim (325mg caffeine). Owners praise the JYM Supplement Science Pre JYM for most complete ingredient breadth and includes creatine and beet-root nitrates; the most common complaint is beta-alanine only 2g (below stronger research range).
Transparent Labs BULK Black Pre-Workout
- Fully disclosed, no proprietary blends
- Strong clinical doses across the board
- Public third-party purity reports
- Nootropics (alpha-GPC, theanine, tyrosine)
- High-stim (325mg caffeine)
- Beta-alanine tingling
- No current iHerb listing found
JYM Supplement Science Pre JYM
- Most complete ingredient breadth
- Includes creatine and beet-root nitrates
- Fully disclosed label
- Excellent value (~$1.67/serving)
- Beta-alanine only 2g (below stronger research range)
- California Prop 65 lead warning on label
- No public sport certification or finished-product COA found
Which should you buy?
The Transparent Labs BULK Black Pre-Workout is the better fit for label-transparency fans and stim-tolerant lifters — it is the higher-scoring pick here, chiefly for Ingredient Dosing and Third-Party Testing. The JYM Supplement Science Pre JYM is the better fit for those wanting creatine + nitrates in the pre and value seekers, and the stronger choice if Value matters more to you than the overall score. If the $1 saving matters more than Ingredient Dosing, the JYM Supplement Science Pre JYM is the better value. The Transparent Labs BULK Black Pre-Workout is a poor fit for stim-sensitive users; the JYM Supplement Science Pre JYM is a poor fit for those wanting a high beta-alanine dose.
Choose the Transparent Labs BULK Black Pre-Workout if
- Label-transparency fans
- Stim-tolerant lifters
- Those wanting full clinical doses
Skip it if
- Stim-sensitive users
- Those avoiding beta-alanine tingles
Choose the JYM Supplement Science Pre JYM if
- Those wanting creatine + nitrates in the pre
- Value seekers
- Full-spectrum formula fans
Skip it if
- Those wanting a high beta-alanine dose
- Buyers wanting sport certification
Common questions
Is the Transparent Labs BULK Black Pre-Workout better than the JYM Supplement Science Pre JYM?
In our Pre-Workout Supplements ranking the Transparent Labs BULK Black Pre-Workout scores higher overall, 9.3 to 7.8, with the biggest advantage in Ingredient Dosing. The JYM Supplement Science Pre JYM is stronger on Value, so it is the better pick if that matters most to you.
How much more does the Transparent Labs BULK Black Pre-Workout cost than the JYM Supplement Science Pre JYM?
$1 more as of June 28, 2026: $54.99 for the Transparent Labs BULK Black Pre-Workout against $53.99 for the JYM Supplement Science Pre JYM. Prices move, so the merchant page shows the current figure. What the extra buys is mostly Ingredient Dosing — 10 versus 8 in our scoring.
What is the main difference between the Transparent Labs BULK Black Pre-Workout and the JYM Supplement Science Pre JYM?
The headline spec difference is Caffeine: 325mg on the Transparent Labs BULK Black Pre-Workout versus 300mg on the JYM Supplement Science Pre JYM. In use, the gap that matters most is Ingredient Dosing (10 vs 8 in our scoring): clinical doses.