Skip Navigation

Innerbody is independent and reader-supported. When you buy through links on our site, we may earn a commission. Learn More

Transparent Labs BULK Pre Workout Reviews

Transparent Labs BULK combines effective ingredients to deliver energy and gains in the gym. Is it the best pre-workout choice for you?

Last Updated: Apr 12, 2022
Transparent Labs Bulk Pre Workout

A good pre-workout should have ingredients that provide energy, focus, and gains so you can put in your best effort at the gym and come away with results. The quality of those ingredients is as important as the quantity and balance, but not every company is up-front about their components.

Transparent Labs addresses this problem by providing third-party test results for all of their supplements. Those results allow you to assess the purity and safety of just about anything they have to offer, at least to a point. You’ll know there are no overtly dangerous substances like E. coli or salmonella, but there are some subtle facts like ingredient sources that these tests don’t provide.

Still, Transparent Labs BULK Pre-Workout boasts non-GMO sources for its components, which are certified gluten-free. It also contains no artificial sweeteners, colors, or preservatives. But is it the right pre-workout for you? Our research team explores all of the pros and cons below.

Review Summary


  • Generous doses of zinc and B12
  • Eight flavor options
  • Sweetened with stevia
  • Gluten-free and non-GMO
  • 60-day money-back guarantee


  • Somewhat medicinal taste
  • Not available without stimulants
  • No subscription option

Bottom line

Transparent Labs BULK Pre-Workout is a relatively clean option for anyone looking to add lean muscle in the gym. It effectively balances ingredients designed to stimulate muscle growth and provide energy and focus. The doses of most of its components are generous, increasing the likelihood that users will feel a difference in their performance.

Our Top Picks

Transparent Labs BULK Pre-Workout

BULK Pre-Workout from Transparent Labs is an effective way to increase lean muscle when paired with strength training.

This pre-workout contains ingredients made to boost energy, focus, and build muscle mass. Choose between 8 different flavors, and enjoy a 60 day money-back guarantee.

1 Jar
Reviewed by Innerbody Research
3 Jars
Reviewed by Innerbody Research
2 Jars
Reviewed by Innerbody Research

Why you should trust us

At Innerbody Research, we extensively test each health product we review, including Transparent Labs BULK Pre-Workout. Our team has collectively spent hundreds of hours testing and researching hair loss supplements like BULK to provide an accurate, unbiased analysis of how they stack up, free of marketing jargon and gimmicks.

Over the past two decades, Innerbody Research has helped tens of millions of readers make more informed decisions to live healthier lifestyles. We evaluate the service based on adherence to quality, the latest medical evidence and health standards, and a simple question: would we buy the product or service ourselves if it weren’t part of our job, and would we recommend it to family and friends?

Additionally, like all health-related content on this website, this review was thoroughly vetted by one or more members of our Medical Review Board for accuracy.

How BULK Pre-Workout works

BULK utilizes a three-prong approach you’ll see in any effective pre-workout supplement. It contains ingredients designed to provide heightened concentration, extended performance, and improved recovery.

Here’s how each of those factors can contribute to your results in the gym:

Heightened concentration

Much of any serious athlete’s game takes place in their head. The mind-muscle connection is crucial for delivering power and maintaining proper form throughout lifts in the gym. This allows you to work specific muscles or muscle groups without relying on secondary groups. It also means you’re less likely to suffer an injury that could set back your progress.

Extended performance

Studies show that various ingredients commonly found in pre-workout supplements can extend performance. Whether that means one more rep in a set, one more set for the day, or even a slight increase in weight is a matter of your preference. Ultimately, these supplements can increase ATP levels and intramuscular creatine concentrations to give you that extra push.

Improved recovery

A good pre-workout will include ingredients tailored for recovery. This means more than just being sore for shorter periods, though that is a part of the picture. What’s crucial is that a pre-workout like BULK primes your muscles to efficiently repair all the microtears you create in your resistance training, maximizing your dietary protein to build lean muscle.

Who would benefit from BULK Pre-Workout?

Transparent Labs BULK Pre-Workout is ideal for lifters in a bulking phase, but it can also provide benefits in a cutting phase if you apply it correctly. Transparent Labs also makes a pre-workout specific to cutting that can help you burn fat, but if cardio and proper diet are a big part of your regimen, BULK might be the better choice to carry you through.

One type of person BULK might not be ideal for is the night-owl. If you prefer to hit the gym after dinner, BULK’s caffeine content is likely too high to let you get the deep, restful sleep that your recovery requires. That’s why Transparent Labs also makes two stimulant-free pre-workouts. They’re not quite as comprehensive as BULK, but they’re still effective.

BULK Pre-Workout flavors

BULK Pre-Workout comes in eight different flavors. The consensus on these is that they could be better. Our testers particularly disliked the blue raspberry. Fortunately, there are enough choices that you can find the flavor that works best for you.

BULK Pre-Workout flavors include::

  • Lemon Lime
  • Watermelon
  • Sour Grape
  • Green Apple
  • Orange
  • Blue Raspberry
  • Strawberry Lemonade
  • Tropical Punch

Transparent Labs uses artificial flavors to achieve these tastes, but they abstain from adding artificial colors, sweeteners, or preservatives. Every flavor contains stevia as a natural source of sweetness.

BULK Pre-Workout ingredients

To better understand whether Transparent Labs BULK is right for you, it would help to understand the drink’s active ingredients. The list is long, but you’ll find that the combination and dosage are such that nearly anyone should feel a nice boost heading into the gym.

Vitamin D3 (75 mcg)

A comprehensive review of studies examining D3’s impact on performance shows improvements in everything from spring times and long jumps to grip strength and lung function. This is a beneficial vitamin to supplement when you have less sun exposure in the winter months.

Vitamin B6 (5 mg)

Vitamin B6 deficiency can lead to anemia, a condition in which your blood fails to carry adequate oxygen to muscles and organs. Conversely, B6 supplementation can improve oxygen transport, which is vital throughout exercise.

Vitamin B12 (100 mcg)

In a study of advanced COPD patients, B12 supplementation significantly improved their endurance. BULK Pre-Workout contains over 4,000% of your daily recommended intake value, so anyone should feel a benefit from it.

Zinc (30 mg)

While studies looking at zinc’s direct role in athletic performance are inconclusive, there is significant evidence that zinc supplementation can boost testosterone production. This would have long-term implications for male athletes who want to see lean muscle gains.

Sodium (150 mg)

Sodium is integral to muscle contraction. It works with potassium and magnesium to provide both contractions and extensions that allow for basic kinetic movement and advanced resistance training.

Potassium (100 mg)

Like sodium, potassium is essential for muscular activity. There is also evidence that potassium helps reduce the buildup of lactic acid after a workout, which can limit soreness and allow you to get back to lifting sooner.

Boron (3 mg)

Boron is a trace mineral that studies have connected to everything from enhanced cognitive performance to reduced oxidative stress. It may even reduce inflammatory biomarkers, which would speed post-workout recovery.

Citrulline Malate 2:1 (6,000 mg)

In a relatively small study of just over 40 participants, citrulline malate increased performance in the gym by extending set length. The same study showed a shortened recovery period and decreased muscle soreness.

Beta-Alanine (4,000 mg)

While beta-alanine appears to benefit various exercise types, some studies point toward its potential to improve performance in high-intensity workouts. That makes this an ideal ingredient for HIIT or CrossFit athletes.

BCAA 2:1:1 (4,000 mg)

In one double-blind study, the self-reported rate of perceived exertion plummeted among participants taking branched-chain amino acids before 10 90-second sprints. Transparent Labs are less than transparent about the source of their BCAAs. They’re listed as fermented BCAAs, which implies non-GMO corn as a source, but the company has not been able to confirm this.

Betaine Anhydrous (2,500 mg)

The European Food Safety Authority lists betaine as safe in doses up to 6 mg/kg of body weight. For a 200 lb. man, that’s a little under 2,000 mg. Still, with background daily betaine intake reaching up to 3,000 mg from food sources, slightly higher supplementation than Europe’s recommendation would appear safe. That’s good news considering the uptick in both reps and sets shown in studies.

Taurine (1,300 mg)

On its own, taurine has been shown to help with oxidative stress and inflammation. This study looks at how taurine can combine with BCAAs to tackle delayed onset muscle soreness better than either component could on its own.

L-Tyrosine (1,000 mg)

Tyrosine exists in BULK Pre-Workout as a nootropic. Its positive effects on focus and cognition are well-documented. One study even demonstrates how it can reverse cognitive difficulties caused by exposure to extreme cold.

L-Theanine (360 mg)

L-theanine is commonly found in green and black teas. It serves a double purpose in this pre-workout by combating the potential jitters resulting from included caffeine while also improving attention and reaction time.

Alpha GPC (300 mg)

In addition to increasing the release of acetylcholine to boost memory and learning, alpha GPC supplementation appears to have physical benefits. This study shows a marked increase in vertical jump power compared to placebo and a caffeine group.

Caffeine anhydrous (180 mg)

Caffeine is one of the most reliable stimulants available. This serving is roughly equivalent to two cups of coffee, giving you a boost in energy, stamina, and focus.

Theobromine (50 mg)

Theobromine is a member of the xanthine group, just like caffeine. In fact, it’s the dominant source of energy in chocolate. Its effects are similar to caffeine, but it tends toward fewer jitters.

DiCaffeine Malate (30 mg)

DiCaffeine malate is a patented caffeine and malic acid mixture designed to offer similar effects as caffeine without the jitters or crash. In BULK, it supports the caffeine already present without contributing to side effects associated with over-caffeination.

AstraGin (25 mg)

AstraGin is a branded extract of the astragalus root and Panax ginseng. Transparent Labs includes the combination for its purported ability to improve nutrient absorption.

Cost, shipping, and returns

Transparent Labs BULK Pre-Workout contains enough mix for 30 servings and costs $49.99. That’s toward the high end among pre-workout mixes, but BULK also contains more ingredients in higher quantities than many others.

Transparent Labs also sells three other pre-workout mixes, each of which costs $49.99:

  • Lean – Designed to enhance fat burning
  • Pump – Focuses on muscle building over all else
  • Stim-Free – A stripped-down supplement with elevATP for natural energy

You can also get a stim booster to add to your pre-workout for $14.99. When mixed with either BULK or Lean, this will make for a highly energizing experience, or you can use it to add a little energy to Pump or the Stim-Free formula.

You can get free shipping on orders over $150. Fortunately, Transparent Labs also sells a variety of other supplements you can stack along with your pre-workout, including:

  • Protein
  • Post-workout (recovery)
  • Strength enhancers
  • Fat burners
  • Nootropics
  • Wellness aids

If you don’t get your order up to $150, Transparent Labs will calculate your shipping charges based on your shipment’s estimated weight and distance from a fulfillment center.

60-day money-back guarantee

If you aren’t satisfied with BULK Pre-Workout, after 60 days, you can request a refund. However, Transparent Labs won’t accept empty containers as refundable, so you should reach out about a refund before finishing the product completely.

HSA, FSA, and health insurance

Transparent Labs products are not eligible for insurance coverage, and the site will not process HSA or FSA cards.

Privacy considerations

The Transparent Labs website uses cookies, web beacons, and other tracking devices to monitor your activity on their website. This has become a standard practice among retailers, and the company states that they won’t share any personal information with third parties.

Is Transparent Labs BULK safe?

Transparent Labs BULK contains ingredients that are generally safe. Some ingredients such as B12 and betaine exist in quantities that could increase side effect risks in some consumers. We also recommend that you curtail your caffeine intake when you start using BULK Pre-Workout until you know how it affects you. You can then begin reintroducing small amounts of caffeine as needed.

Alternatives to Transparent Labs BULK

Transparent Labs BULK Pre-Workout is by no means your only option for energy and focus before you hit the gym. Some have similar ingredients, while others use very different means to achieve the same ends.


Trenorol is marketed as an alternative to a dangerous, illegal substance called Trenbolone. Unlike Trenbolone, Trenorol contains no illicit ingredients and is significantly safer. We prefer a Trenorol supplement from CrazyBULK, who offer you a free bottle when you buy two.

Zuum by UMZU

Zuum features a smaller list of ingredients than BULK Pre-Workout, but many are similar to what you’ll find there. They include B vitamins, citrulline, and AstraGin. That shortened ingredient list is part of why Zuum is also less expensive than BULK. The most noteworthy absence is the BCAAs. Check out our UMZU reviews to learn more about the company.

Testosterone boosters

Low energy in the gym, slow recovery, and insufficient gains might not be something you can address with workout supplements alone. These are also symptoms of low testosterone, and if your T levels are low enough, no amount of protein or pre-workout will make a real difference in your experience.

You can find out if you have low T by taking a simple test either through your doctor or with a convenient at-home test. The at-home tests have gotten more accurate, convenient, and inexpensive. You can find out which one is right for you by consulting our complete at-home testosterone testing guide.

If you find out that your T levels are slightly low, we recommend looking into a testosterone booster. These can be anything from direct testosterone supplementation to natural supplements that can increase testosterone production in your body.

Check out our comprehensive testosterone booster guide for more information about possible solutions.

How we evaluate home health products and services

At Innerbody Research, we customize our evaluation criteria depending on the type and nature of the health-related service or product. For health products and services, we have five areas that we use for our evaluations, including:

Quality: How well does the company deliver its core service(s) to the customer? For testing services, does the company adhere to the latest and most advanced testing technologies and achieve a very high degree of accuracy? For non-testing telehealth services, is the quality of the service high enough that we would recommend it to loved ones without hesitation? If not, why not?

User-friendly: How intuitive and user-friendly is the service? Does the device, program, app, or website achieve a good degree of user-friendliness for its customers?

Value: Are you getting your money’s worth? Are there any hidden costs or charges? Does the company offer discounts?

Privacy: If health data is stored, will your data be stored securely? Are payments secure?

Customer support: Particularly in situations where ‘one size fits all’ doesn’t make sense, how well does the company help to make the service ideal for you?

Current Deals
Company logo

60 Day

Money-Back Guarantee