Comparison · Dated labels

Transparent Labs Bulk Black Pre-Workout vs Transparent Labs Lean Pre-Workout

THE SHORT ANSWER

Transparent Labs Bulk Black Pre-Workout declares 325 mg of caffeine per serving and Transparent Labs Lean Pre-Workout declares 180 mg, on labels both observed August 3, 2026. At the prices FormulaSignal observed, Transparent Labs Bulk Black Pre-Workout costs $1.83 a serving and Transparent Labs Lean Pre-Workout $1.67. They share 4 declared active ingredients; Transparent Labs Bulk Black Pre-Workout lists 8 the other does not, and Transparent Labs Lean Pre-Workout lists 10.

Every figure here is read from the FormulaSignal Record, from each brand's own product page, with the date it was observed. No winner is declared and no product is scored.

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At a glance

Two labels, the same five facts.

TRANSPARENT LABS

Transparent Labs Bulk Black Pre-Workout

Caffeine per serving: 325 mg
Price per serving: $1.83
Main actives at researched doses: 3 of 3
Label observed: August 3, 2026
Confirmed formula changes: 0

Full Record and history

TRANSPARENT LABS

Transparent Labs Lean Pre-Workout

Caffeine per serving: 180 mg
Price per serving: $1.67
Main actives at researched doses: 2 of 4
Label observed: August 3, 2026
Confirmed formula changes: 0

Full Record and history

Which fits you

Choose by what you care about.

Each line is a measured difference between the two labels, not a verdict. Nothing here says either product works, or is safe for you.

You want less caffeine per serving: Transparent Labs Lean Pre-Workout
180 mg against 325 mg declared per serving. Less is not safer and more is not better; how much suits you is a question for a clinician.
Cost per serving matters most: Transparent Labs Lean Pre-Workout
$1.67 against $1.83 a serving at the prices FormulaSignal observed (Aug 3, 2026). Not every price here is established as a list price.
You want more of the main actives at researched doses: Transparent Labs Bulk Black Pre-Workout
3 of 3 main actives on Transparent Labs Bulk Black Pre-Workout sit inside the dose range the cited research used, against 2 of 4 on Transparent Labs Lean Pre-Workout. A comparison of numbers, not of how well either works.

Side by side

Transparent Labs Bulk Black and Transparent Labs Lean, line by line.

The same fields the FormulaSignal API and MCP server return for this pair.

Transparent Labs Bulk Black Pre-Workout compared with Transparent Labs Lean Pre-Workout on declared and observed values.
Field	Transparent Labs Bulk Black	Transparent Labs Lean
Caffeine per serving The Record's total across every declared caffeine source. Neither direction is better.	325 mg	180 mg
Price per serving Observed package price divided by the stated serving count. The basis of each price is on the product's Record.	$1.83	$1.67
Monthly cost at five uses a week	$39.65	$36.18
Servings per container	30	30
Ingredients with a disclosed amount A proprietary blend total counts as one amount, and the split inside it stays undisclosed.	16 of 16	15 of 15
Main actives inside researched doses Declared amounts measured against the range the cited research used. Not a measure of effectiveness.	3 of 3	2 of 4
Documented cautions	Stimulant-load gate, Alpha-GPC 50% material	None on file
Regulatory records A filing exists. It is not a finding about safety.	None on file	None on file
Confirmed formula changes Zero means none confirmed, not that the formula never changed.	0	0
Label observed	August 3, 2026	August 3, 2026

Ingredient by ingredient

What both declare, and what only one does.

Matched by FormulaSignal's normalized identity, so two brand names for the same compound line up and two forms of one ingredient do not. Vitamins, minerals and electrolytes are left out; caffeine is compared as a total above.

Active ingredients declared by both products, with each declared amount.
Declared by both	Transparent Labs Bulk Black	Transparent Labs Lean
Citrulline malate	8000 mg	6000 mg
Beta-alanine	4000 mg	2000 mg
L-theanine	200 mg	180 mg
Huperzine A (Huperzia serrata) (leaf)	200 mcg	100 mcg

Only on Transparent Labs Bulk Black Pre-Workout

Zinc (as Zinc Chelate): 10 mg
Potassium (as Potassium Citrate): 130 mg
Betaine Anhydrous (BetaPure): 2500 mg
L-tyrosine: 2000 mg
Alpha-GPC 50% material: 300 mg
Senactiv Tienchi Ginseng (Panax notoginseng) (Root) Extract & Chestnut Rose (Rosa roxburghii) (Fruit) Extract: 50 mg
Bioperine (Black Pepper Extract) (Piper nigrum) (fruit): 5 mg
Boron (from Boron Citrate): 3 mg

Only on Transparent Labs Lean Pre-Workout

Iodine (as Potassium Iodide): 225 mcg
Zinc (as Zinc Citrate): 15 mg
Selenium (as L-Selenomethionine): 55 mcg
Copper (as Copper Carbonate): 1 mg
Chromium (as Chromax (Chromium Picolinate)): 200 mcg
Betaine anhydrous: 1500 mg
Acetyl L-Carnitine HCl: 1000 mg
Choline bitartrate: 500 mg
Theobromine: 50 mg
Bioperine (Piper Nigrum) (Black Pepper (Fruit) Extract): 5 mg

Evidence

Open the sources behind every figure.

Each product's Record lists every capture, with both its observation and access dates.

Transparent Labs Bulk Black Pre-Workout: label
Transparent Labs · P1 · observed August 3, 2026
Open source evidence
Transparent Labs Bulk Black Pre-Workout: price
Transparent Labs · observed price, basis not established · observed August 3, 2026
Open source evidence
Transparent Labs Lean Pre-Workout: label
Transparent Labs · P1 · observed August 3, 2026
Open source evidence
Transparent Labs Lean Pre-Workout: price
Transparent Labs · observed price, basis not established · observed August 3, 2026
Open source evidence

Questions

Transparent Labs Bulk Black vs Transparent Labs Lean: common questions

Which has more caffeine, Transparent Labs Bulk Black or Transparent Labs Lean?

Transparent Labs Bulk Black Pre-Workout declares 325 mg per serving and Transparent Labs Lean Pre-Workout 180 mg, on the labels observed August 3, 2026 and August 3, 2026. More caffeine is not better; what suits you is a question for a clinician.

Is Transparent Labs Bulk Black stronger than Transparent Labs Lean?

If “stronger” means caffeine, Transparent Labs Bulk Black Pre-Workout declares more (325 mg against 180 mg). FormulaSignal does not rate how strong a product feels; that is an experience question the labels cannot answer.

Which is cheaper per serving?

Transparent Labs Lean Pre-Workout, at $1.67 a serving (observed price, basis not established on Aug 3, 2026), against Transparent Labs Bulk Black Pre-Workout at $1.83 a serving (observed price, basis not established on Aug 3, 2026).

Do Transparent Labs Bulk Black and Transparent Labs Lean contain creatine?

Transparent Labs Bulk Black Pre-Workout: none declared on its complete label. Transparent Labs Lean Pre-Workout: none declared on its complete label.

Do they contain beta-alanine?

Transparent Labs Bulk Black Pre-Workout: Beta Alanine (4000 mg). Transparent Labs Lean Pre-Workout: Beta-Alanine (2000 mg).

Has either formula changed?

FormulaSignal holds no confirmed change for either product. That is a statement about the Record, not a finding that neither formula ever changed.

Keep comparing

Lists that include both

Every comparison · Pre-workout lists · What the Record covers

Considering both?

Keep them in your Locker, free.

Save either one as Considering. Your Locker keeps the dated label reference, and optional monitoring tells you if a formula you rely on changes before you reorder.

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