Transparent Labs Bulk Black Review: Is This Strong Enough?

by Nader Qudimat
Updated July 2, 2024
Pre Workout
Serving Size
Enhanced formula for increased strength
Provides high energy boost
Balanced and comprehensive ingredient profile
None identified

Bottom Line

Transparent Labs Bulk Black Pre-Workout is designed for fitness enthusiasts who need an extra boost before workouts.

This supplement offers a potent, clinically dosed formula with full ingredient transparency.

Personally, I find it ideal for daily use, providing significant energy without the harsh side effects of stronger alternatives.

The price is reasonable, and you can get an additional discount with the code FITFREK10.


If you're seeking a pre-workout supplement that delivers an intense energy boost, Transparent Labs Bulk Black might be on your radar.

Known for its potent formula, Bulk Black stands out in the Transparent Labs lineup due to its higher caffeine content and enhanced performance benefits.

Unlike their more moderate offerings, such as Bulk and Lean, which contain around 220mg of caffeine, Bulk Black steps it up with approximately 300mg of caffeine sourced from multiple ingredients.

(See Is Transparent Labs Legit?)

Let's dive into my personal experience with Bulk Black, followed by a detailed breakdown of its ingredients and frequently asked questions.

My Bulk Black Experience

Having used the original Bulk for those moderate energy needs, I was eager to try Bulk Black for a more intense boost.

The original Bulk has always been reliable for those days when a gentle caffeine nudge was enough to power through workouts without overwhelming jitters.

However, Bulk Black is a whole different beast.

From the moment I took a sip, the energy surge hit hard and fast, thanks to its solid 300mg of caffeine content.

It’s like the big brother of the Transparent Labs family, flexing its muscles and showing off its strength.

The energy coursed through my veins almost instantly, providing a powerful kick.

One of the best aspects of Bulk Black is the lack of a crash.

It's like riding a high-speed train that smoothly slows as it approaches the station.

While the pump effects are decent and improve blood flow, they aren't extraordinary but sufficient to keep you going.

The real star of Bulk Black is its clean, natural sweetness.

It’s like sipping on a refreshing, guilt-free elixir that supercharges your workout without any artificial aftertaste.

From start to finish, it's a clean and powerful experience.


Bulk Black by Transparent Labs

If you want a daily driver pre workout with 300mg caffeine, featuring a fully transparent and legit label, then consider this limited edition pre workout from Transparent Labs, Bulk Black.

  • Long-Lasting Energy: Provides sustained energy without a crash.
  • Enhanced Focus and Motivation: Improves mental clarity and concentration.
  • Clean, Natural Sweetness: Refreshing taste without the jitters.
  • High Caffeine Content: May cause sensitivity in some users.
  • Potential for Jitters: Some users might experience jitters due to high stimulant content
Ingredients: 8g Citrulline Malate, 4g Beta-Alanine, 2.5g Betaine Anhydrous, 1.3g Taurine, 1g L-Tyrosine, 300mg AlphaSize (Alpha-GPC), 180mg Sodium, 130mg Potassium, 50mg SenActiv, 10mg Zinc, 5mg Vitamin B6, 5mg Bioperine (Black Pepper Extract), 3mg Boron, 100mcg Vitamin B12
Stimulants: 275mg Natural Caffeine, 200mg L-Theanine, 100mg Theobromine, 75mg Infinergy (Dicaffeine Malate)
FitFrek earns a commission if you click this link and make a purchase, at no additional cost to you.

Transparent Labs BULK Black is a unique blend that's as clean as it gets.

Sweetened with stevia, it skips the sugars and carbs, making it a calorie-free companion for your workouts.

This formula is a powerhouse of 17 ingredients, featuring essential vitamins and minerals alongside 12 active ingredients that deliver physical and mental benefits you can feel.

Key Vitamins and Minerals

  • Vitamins D, B6, and B12: Support immune function, energy metabolism, and neurological health.
  • Sodium and Potassium: Essential electrolytes that maintain fluid balance and muscle function.

Citrulline Malate (8g)

Citrulline malate is a combination of the amino acid citrulline and malate, an apple derivative.

It’s known for its ability to increase nitric oxide production, which can improve blood flow, delay muscle fatigue, and enhance strength and aerobic performance. Citrulline is also found in some foods, like watermelon.

In the body, citrulline plays a key role in the urea cycle, which helps your body eliminate harmful nitrogen waste substances.


  • Increases nitric oxide production [1, 4]
  • Improves blood flow [2, 5]
  • Delays muscle fatigue [3, 6, 7]
  • Enhances strength and aerobic performance [4, 5, 6, 7]

Additional Health Benefits:

  • May improve heart health [1]
  • Boosts immune function [4]
  • Benefits individuals with diabetes and erectile dysfunction [2, 3]

Beta-Alanine (4g)

Beta-alanine is an amino acid that’s used by your body to produce carnosine, a substance that helps muscle endurance during high-intensity exercise.

It can delay muscular fatigue, increase overall muscle strength, and improve muscle endurance.

Beta-alanine is unique because it’s not used to synthesize proteins.

Instead, it helps buffer acid in muscles, delaying the onset of muscle fatigue and allowing for increased performance.


  • Delays muscular fatigue [8, 9]
  • Increases overall muscle strength [1011, 12]
  • Improves muscle endurance by increasing carnosine concentrations in muscles [1011]
  • May cause a harmless tingling sensation known as paresthesia (side effect) [8, 9]

BetaPure Betaine Anhydrous (2.5g) 

Betaine anhydrous, also known as trimethylglycine (TMG), is a naturally occurring compound found in foods like beets and spinach.

It's known for its ability to enhance physical performance by acting as a methyl donor in metabolic processes.

This action helps optimize energy production and improve muscle strength and endurance. Additionally, betaine helps balance homocysteine levels, reducing the risk of cardiovascular diseases.

It also acts as an osmolyte, enhancing cell hydration and nutrient absorption, which protects against metabolic stress.


  • Boosts physical performance [1317]
  • Balances homocysteine levels [14]
  • Enhances cell hydration [1517]
  • Protects against metabolic stress [1617]
  • Improves strength, power, and body composition [13,17]

Taurine (1.3g)

Taurine is an amino acid that supports several critical bodily functions.

It is well-known for its role in promoting hydration and enhancing mitochondrial efficiency, which helps in maintaining cellular energy levels.

Taurine also supports calcium signaling in muscle tissues, aiding in muscle contraction and preventing cramps. Furthermore, it acts as a powerful antioxidant, protecting cells from damage.

In the brain, taurine mimics a neurotransmitter called gamma-aminobutyric acid (GABA), which has calming effects.

It also helps regulate dopamine production and can aid in fat loss by promoting the conversion of white adipose tissue to brown adipose tissue.


  • Improves hydration [1819]
  • Enhances mitochondrial efficiency [18, 20]
  • Supports calcium signaling in muscles [19, 21]
  • Functions as a powerful antioxidant [18, 22]
  • Enhances cognitive function [1821]
  • Upregulates dopamine production [20, 22]
  • Aids in fat loss by converting white adipose tissue to brown adipose tissue [19, 20]

Tyrosine (1g)

Tyrosine is an amino acid that plays a crucial role in the production of several important neurotransmitters, including dopamine, adrenaline, and noradrenaline.

These neurotransmitters are essential for regulating mood, motivation, and mental performance.

Supplementing with tyrosine can help enhance focus, motivation, and energy, especially under stress or sleep deprivation.

It also supports thyroid function, which is vital for maintaining metabolic rate and overall energy levels.


  • Enhances focus, motivation, and energy by acting as a precursor to crucial neurotransmitters [23]
  • Supports thyroid function [24
  • Improves cognitive function during sleep deprivation [25]

AlphaSize Alpha-GPC (300mg)

Alpha-GPC (alpha-glycerophosphocholine) is a cholinergic compound that boosts the levels of acetylcholine, a neurotransmitter involved in learning and memory.

This compound enhances the mind-muscle connection, which can improve muscle contractions and exercise performance. Alpha-GPC is also known for its cognitive benefits, supporting mental clarity and focus.

Additionally, it may boost growth hormone levels, which can aid in muscle growth and recovery.


  • Enhances mind-muscle connection [26]
  • Increases acetylcholine production [27, 28]
  • Supports cognitive function [26, 28]
  • May boost strength and growth hormone levels [26]

L-Theanine (200mg)

L-Theanine is an amino acid found in tea leaves that promotes relaxation without causing drowsiness.

When combined with caffeine, it helps enhance mood, cognition, and focus while reducing the jittery side effects often associated with caffeine consumption.

L-Theanine works by increasing the levels of calming neurotransmitters like GABA, serotonin, and dopamine, making it an excellent addition to a pre-workout formula to help maintain focus and reduce anxiety.


  • Reduces anxiety [29]
  • Enhances mood and cognition [30]
  • Improves sleep quality [31]
  • Works synergistically with caffeine to improve mental accuracy and reduce fatigue [32]

Caffeine Anhydrous (275mg)

Caffeine anhydrous is a dehydrated form of caffeine that provides a quick and potent energy boost.

It is a central nervous system stimulant that can help increase alertness, focus, and physical performance. Caffeine works by blocking adenosine receptors in the brain, which helps reduce the perception of fatigue.

Additionally, caffeine increases the levels of cyclic adenosine monophosphate (cAMP) in cells, which enhances metabolic rate and promotes fat burning.


  • Staves off fatigue [33]
  • Enhances focus [34]
  • Boosts metabolism [35]
  • Increases cyclic adenosine monophosphate (cAMP) levels, leading to more calories burned [36]

Theobromine (100mg)

Theobromine is a compound found in cocoa that is structurally similar to caffeine.

It has stimulant effects but is milder and longer-lasting compared to caffeine.

Theobromine supports cardiovascular health by relaxing blood vessels and reducing blood pressure.

It also enhances the mood and provides a smooth, sustained energy release without the crash often associated with caffeine.


  • Supports cardiovascular health [37]
  • Relaxes smooth muscle [37]
  • Reduces blood pressure [37]
  • Works synergistically with caffeine to provide balanced energy [37]


Infinergy (Dicaffeine Malate) (75mg)

Infinergy, also known as dicaffeine malate, is a patented form of caffeine that combines caffeine and malic acid.

This combination provides a smoother, longer-lasting energy boost with less risk of the crash associated with regular caffeine.

Infinergy helps maintain energy levels, enhances focus, and supports endurance throughout the workout.


  • Provides a longer-lasting energy curve with less crash 
  • Combines quick and extended-release caffeine for smoother energy

Bioperine (5mg)

Bioperine is a patented extract derived from black pepper fruits (Piper nigrum) standardized to a minimum of 95% piperine.

It enhances the bioavailability of various nutrients through increased absorption.

This makes Bioperine an important ingredient in the formula as it helps ensure that you get the maximum benefit from all the other ingredients in the pre-workout.


  • Enhances nutrient absorption 
  • Ensures maximum benefit from each ingredient 

Boron (3mg)

Boron is a trace mineral that supports bone health and cognitive function.

It plays a role in bone metabolism and the maintenance of bone strength.

Additionally, boron helps improve mental clarity and coordination, making it a beneficial addition to a pre-workout supplement.


  • Strengthens bones 
  • Enhances mental sharpness 

Sodium (180mg) and Potassium (130mg)

Sodium and Potassium are essential electrolytes that help maintain fluid balance and support muscle function.

Their inclusion in Bulk Black ensures that you stay hydrated and that your muscles work efficiently, which is vital for endurance and performance during workouts.

Zinc (10mg)

Zinc is an essential mineral that plays a vital role in many aspects of health.

It supports immune function, aids in wound healing, and is necessary for DNA synthesis and cell division.

Zinc is also important for maintaining a healthy metabolism and has antioxidant properties that help protect cells from damage.


  • Maintain fluid balance 
  • Support muscle function 
  • Support immune function
  • Aid in energy production
  • Support brain health

Vitamin B6 (5mg)

Vitamin B6, also known as pyridoxine, is a water-soluble vitamin that is involved in over 100 enzyme reactions in the body's cells.

It is crucial for brain development and function, and helps the body convert food into energy. Vitamin B6 also plays a role in mood regulation and the creation of neurotransmitters.


  • Maintain fluid balance 
  • Support muscle function 
  • Support immune function
  • Aid in energy production
  • Support brain health

Vitamin B12 (100mcg)

Vitamin B12, also known as cobalamin, is essential for the production of red blood cells and DNA, as well as the proper functioning of the nervous system.

It helps prevent megaloblastic anemia, a condition that makes people tired and weak. Vitamin B12 is also important for maintaining energy levels and overall vitality.


  • Maintain fluid balance 
  • Support muscle function 
  • Support immune function
  • Aid in energy production
  • Support brain health

BULK Black vs BULK

In the comparison between BULK Black and BULK, notable differences in their formulations are evident, impacting their effectiveness and suitability for various fitness goals:

Citrulline Malate: Both BULK Black and BULK are formulated with 8g of Citrulline Malate, supporting enhanced blood flow and improved workout performance by boosting nitric oxide production.

Betaine Anhydrous: Both supplements include 2.5g of Betaine Anhydrous, aiding in muscle strength and power, underscoring their commitment to enhancing physical performance.

Caffeine: BULK Black ramps up the energy with 350mg of total caffeine (275mg of natural caffeine plus 75mg from Infinergy DiCaffeine Malate), compared to BULK's 200mg. This adjustment positions BULK Black as the go-to for those seeking a more intense energy surge.

Theobromine: BULK Black has 100mg theobromine, vs the 50mg theobromine that's in the original BULK. Theobromine will help elevate mood and provide a nice smooth source of energy. 

Theanine: Each formula incorporates 200mg of L-Theanine, balancing the stimulant effects of caffeine to provide focused energy without the jitters, ensuring both supplements offer a smooth energy curve.

Boron Citrate: BULK Black includes 3mg of Boron Citrate, a component also present in BULK. Boron supports bone health and cognitive function, adding an extra dimension to BULK Black's comprehensive approach to pre-workout supplementation.

These distinctions highlight BULK Black's positioning as a more potent option for those desiring a stronger pre-workout boost, while BULK remains a solid choice for balanced energy and performance enhancement.

BULK Black vs LEAN

Comparing BULK Black and LEAN, the differences are more clear:

  • Citrulline Malate: BULK Black contains 8g of citrulline malate, while LEAN contains a lower amount at 6g.

  • BCAA: Unlike BULK Black, LEAN contains 2.5g of BCAAs, which can aid in muscle growth and recovery.

  • Beta Alanine: BULK Black contains 4g of beta alanine, while LEAN contains a lower amount at 2g. Beta alanine can help improve athletic performance and exercise capacity.

  • Acetyl L-Carnitine HCl: LEAN contains 630mg of Acetyl L-Carnitine HCl, an ingredient not found in BULK Black. This compound can help the body produce energy and is important for heart and brain function.

  • Choline Bitartrate: LEAN contains 500mg of choline bitartrate, another ingredient not found in BULK Black. Choline is an essential nutrient that supports various bodily functions, including cellular growth and metabolism.

  • Caffeine: BULK Black contains 275mg of caffeine anhydrous, while LEAN contains a slightly lower amount at 180mg.

  • BioPerine: LEAN contains 5mg of BioPerine, an ingredient also in BULK Black. BioPerine is a black pepper extract that can enhance the absorption of other nutrients.

Bulk Black vs Pre Kaged Elite

Transparent Labs Bulk Black Pre-Workout and Pre-Kaged Elite are both high-quality pre-workout supplements designed to enhance your gym performance.

However, they differ in their ingredient profiles, which may influence their effects and suitability for different individuals.

Caffeine Content

Transparent Labs Bulk Black Pre-Workout contains 300mg of caffeine, which is a potent stimulant that can enhance focus and energy levels.

On the other hand, Pre-Kaged Elite packs a slightly higher caffeine content of 388mg, which may provide a stronger energy boost.

Amino Acids

Both pre-workouts contain L-Citrulline, an amino acid known for its ability to improve blood flow and reduce muscle fatigue.

However, Pre Kaged Elite contains a whopping 10,000mg of L-Citrulline, which is significantly higher than the amount typically found in pre-workouts.

Bulk Black also contains L-Theanine, an amino acid that promotes relaxation and can help take the edge off the stimulant effects of caffeine.

Unique Ingredients

Transparent Labs Bulk Black Pre-Workout contains Bioperine, a compound that enhances nutrient absorption, potentially increasing the effectiveness of the other ingredients in the supplement.

On the other hand, Pre Kaged Elite contains unique ingredients like BetaPower (Betaine Anhydrous) and Carnipure (L-Carnitine Tartrate), which are known to enhance power output and reduce exercise-induced muscle tissue damage, respectively.

Creatine Content

Bulk Black doesn't contain creatine, a compound that enhances strength and power output.

However, Pre Kaged Elite contains two forms of creatine: Creatine Monohydrate and Creatine Nitrate, which may provide a more sustained release of creatine into the body.

Stimulant Profile

Transparent Labs Bulk Black Pre-Workout contains three sources of caffeine for a sustained energy release, including Infinergy (dicaffeine malate), which provides a smoother energy curve with less crash.

Pre Kaged Elite, on the other hand, sources its caffeine from PurCaf, a patented extraction process from organic green coffee beans, and AmaTea, a blend of caffeine and polyphenol antioxidants.

So the bottom line: both pre-workouts are packed with potent ingredients designed to enhance your workout performance.

Your choice between the two may depend on your specific fitness goals, tolerance to stimulants, and preference for certain ingredients.

Who Should Buy BULK Black Pre-Workout?

If you're someone who's serious about their fitness and looking to take your workouts to the next level, BULK Black Pre-Workout could be a game-changer for you.

Here's why:

  1. Gym Athletes: Whether you're a bodybuilder, an athlete, or just someone who enjoys a good workout, BULK Black can help you push past your limits. Its blend of ingredients is designed to enhance your performance, increase your endurance, and speed up your recovery.

  2. Health-Conscious Users: If you're mindful of what you put into your body, you'll appreciate BULK Black's clean formula. It's free of artificial sweeteners, coloring, and preservatives, and it's sweetened with stevia, a natural sweetener.

  3. People Looking For Better Focus: The inclusion of ingredients like AlphaSize Alpha-GPC, caffeine anhydrous, and L-theanine means that BULK Black can help enhance your mental focus during workouts. This can be particularly beneficial if you engage in exercises that require a high level of concentration, like yoga or pilates.

  4. Those Looking for a Calorie-Free Supplement: BULK Black is calorie-free, making it a great choice if you're watching your caloric intake or trying to lose weight.

Who Shouldn't Buy BULK Black Pre-Workout?

While BULK Black Pre-Workout is a high-quality supplement, it's not for everyone. Here's who might want to think twice:

  1. People Sensitive to Caffeine: BULK Black contains around 300 of caffeine, with multiple forms of caffeine. If you're sensitive to caffeine or other stimulants, you might experience side effects like jitteriness, insomnia, or rapid heartbeat.

  2. Pregnant or Nursing Women: As with most dietary supplements, if you're pregnant or nursing, it's best to consult with a healthcare professional before using BULK Black.

  3. Those with Certain Medical Conditions: If you have a medical condition, particularly a heart condition, or if you're taking medication, it's recommended to consult with a healthcare professional before using BULK Black. Some ingredients in the supplement could interact with certain medications or exacerbate certain health conditions.

  4. People Under the Age of 18: BULK Black is intended for adults and should not be used by individuals under the age of 18. Although it's likely safe to be used by those under 18, it's just what they stated. 

Remember, it's always a good idea to talk to your doctor or a qualified healthcare professional before using any new supplement.


Here's your FAQ's about Bulk Black answered...

What are the key features of Bulk Black Pre-Workout?

Bulk Black Pre-Workout is designed with an enhanced formula that includes 8,000 mg of L-Citrulline Malate for improved blood flow and muscle pumps, and 75 mg of Infinergy™ Di-caffeine Malate for sustained energy and focus. It also contains 200 mg of L-Theanine to help smooth out the stimulant effect, providing focused energy without the jitters. The formula is balanced with 10 mg of Zinc Chelate for immune support and overall health, making it a potent choice for those looking to maximize their workout intensity.

How long before a workout should I take Bulk Black for optimal results?

For optimal results, take Bulk Black 20-30 minutes before your workout. This timing allows the ingredients to activate fully, ensuring you get the most out of your training session.

Can I take Bulk Black on non-workout days?

Yes, you can take Bulk Black on non-workout days, though it's specifically formulated to enhance workout performance. Some users may choose to take it on rest days for the cognitive benefits provided by ingredients like caffeine and L-Theanine.

Is Bulk Black suitable for vegetarians or vegans?

Yes, Bulk Black is suitable for both vegetarians and vegans as it does not contain any animal-derived ingredients.

Can I stack Bulk Black with other supplements?

Yes, Bulk Black can be stacked with other supplements. It's important to monitor your total caffeine intake when stacking with other stimulant-containing supplements to avoid overstimulation.

How does Bulk Black taste?

Bulk Black comes in several flavors, including Blue Raspberry, Cherry Kiwi, Blueberry Pomegranate and Sour Gummy. Users generally report that the flavors are enjoyable and not overly sweet, making it a pleasant addition to your pre-workout routine.

Bottom Line

Bulk Black by Transparent Labs is a pre-workout supplement that stands out for its potent energy boost and clean, natural sweetness.

It's packed with a robust 350mg of caffeine, making it one of the most caffeinated options in the Transparent Labs lineup.

Despite the high caffeine content, users can expect a smooth experience with no crashes.

The energy surge is swift and potent, kicking in almost instantly after consumption.

While the pump effects are decent, they may not meet the expectations of those seeking the ultimate pump effects.

However, the natural sweetness of Bulk Black adds a refreshing touch to the pre-workout experience, making it feel super clean to drink.

It's a pre-workout that offers a clean experience, from start to finish, making it a great choice for those seeking a strong energy boost without the crash.


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by Nader Qudimat

Forged by iron and cold steel, I'm Nader, a mid-30s natural bodybuilder. Once a 100lb skinny guy, I've transformed into a 200lb muscular athlete with over 15 years of lifting experience. Today, I leverage my transformation and extensive experience to guide countless individuals on their fitness journeys.

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