Overview

Are you tired of "cutting pre-workouts" that just don't...cut it? If so, you've come to the right spot! Transparent Labs Lean Pre-Workout is an evidence-based pre-workout formula featuring clinical doses of ergogenic ingredients that help you perform your best in the gym while supporting your fat-loss efforts. Experience the difference of a true cutting pre-workout formula that gets you dialed in for every training session by enhancing blood flow, strength, endurance, focus, drive, and energy production.

Each ingredient in this pre-workout supplement was carefully chosen based on scientific research and quality characteristics, two factors that are sadly overlooked far too often in the sports supplement realm. Like all of our products, Lea Pre-Workout has fully transparent labeling, and absolutely no artificial color/food dyes, artificial sweeteners, or artificial flavoring.

Key Features

Clinically Dosed Pre-Workout for Lean Mass Retention and Fat Loss: Transparent Labs LEAN Pre-Workout is an evidence-based pre-workout that enhances athletic performance while supporting fat loss.
Improves Strength, Stamina, and Muscle Pumps During Training: With a comprehensive lineup of clinically dosed nitric oxide boosters and ergogenic aids, LEAN Pre-Workout augments athletic performance and increases blood flow to muscle tissue starting from the very first scoop.
Provides an Immediate Energy Boost with Natural Caffeine: Leave even the most intense workouts in the dust with clean nootropics like PurCaf® caffeine, theobromine, acetyl-L-carnitine, and choline bitartrate.
Choose from 8 Refreshing All-Natural Flavors Sweetened with Stevia: Most pre-workouts come loaded with artificial colors, sweeteners, or flavors. We know you care about what you put in your body, so our goal was to make LEAN a great-tasting pre-workout with natural flavoring and stevia instead of the hidden junk you find in other caffeine-infused pre-workouts.
Third-Party Tested and Certified for Quality: As part of our commitment to industry-leading transparency and quality, every batch of this product is tested by a third-party lab for purity and potency. You can find all of our test results in the footer of our website. This product is also certified by Informed Choice to meet the highest standards for athletes and consumers.

Active Ingredients and Benefits

*Doses listed are per serving (1 full scoop)

L-Citrulline Malate (2:1) | 6,000 mg

L-citrulline is an amino acid naturally found in watermelon that plays an important role in kidney function. It's become a popular ingredient in pre-workout supplements due to its ability to boost nitric oxide levels [1]. When nitric oxide production increases, blood flow improves, allowing nutrients and oxygen to replenish muscle tissue more efficiently. Ultimately, this translates to greater muscle pumps and heightened energy levels.

Numerous studies have demonstrated the ergogenic effects of L-citrulline malate, the citrulline salt of malic acid, such as:

Improving strength, aerobic performance, and muscle endurance [2, 3]
Elevating nitric oxide levels even more than equivalent doses of L-arginine [4]
Enhancing muscle anabolism and reducing muscle catabolism [5]

Beta-Alanine | 2,000 mg

Beta-alanine is a beta-amino acid that combines with L-histidine to form a dipeptide known as carnosine. Supplementing with beta-alanine has been shown to increase muscle carnosine levels, which are quickly depleted during intense exercise [6].

Carnosine is an endogenous dipeptide that functions as a buffer in muscle cells, thereby attenuating the accumulation of acidic byproducts of muscular exertion (e.g. lactate and hydrogen ions) [7]. Hence, bolstering muscle carnosine levels—via beta-alanine—allows you to push yourself longer and harder in the gym.

Pre-workout supplements almost always contain beta-alanine but in inefficacious doses. We made sure to include an evidence-based dose of beta-alanine (2,000 mg) in every scoop of LEAN Pre-Workout. Relevant evidence-based benefits of beta-alanine include:

Delaying the onset of neuromuscular fatigue during intense exercise [8]
Increasing overall muscle strength [9]
Improving muscle endurance and total work capacity [10]
Reducing and combatting the formation of dysfunctional proteins and promoting the formation of healthy proteins [11]
Significantly increasing lean muscle mass as part of a diligent resistance-training program [12]

*Note that beta-alanine causes a benign tingling sensation known as paresthesia while the body acclimates to higher carnosine levels. This effect is harmless and gradually lessens with consistent use.

BetaPure™ Betaine Anhydrous | 1,500 mg

Betaine, also known as trimethylglycine, is a naturally occurring metabolite that serves as a methyl donor and osmolyte in the body. Though the mechanisms are not entirely understood, betaine supplementation has shown promise in enhancing power output and, to a lesser extent, endurance capacity in athletes [13, 14, 15]. It is plausible that betaine supplementation promotes athletic performance by maintaining cellular hydration and reducing homocysteine levels, thereby encouraging healthy cardiovascular function and blood flow [16].

Acetyl-L-Carnitine (ALCAR) | 1,000 mg

Acetyl-L-carnitine (ALCAR) is a bioavailable form of L-carnitine, an essential molecule for transporting fatty acids across mitochondrial membranes so they can be used for energy. ALCAR is suggested to have diverse ergogenic properties for athletes and gym-goers due to its potent nootropic effects that promote healthy mood and cognitive function and protect against neurodegeneration [17, 18].

ALCAR may also enhance physical performance and target stubborn fat by facilitating fatty acid oxidation [19, 20].

Choline Bitartrate | 500 mg

Choline is an essential micronutrient for cholinergic transmission and, by extension, cognitive function. This ingredient can enhance physical and mental performance by increasing acetylcholine and supporting lipid metabolism [2 1, 22].

PurCaf® Organic Caffeine | 180 mg

While most pre-workouts contain synthetic caffeine anhydrous, we formulated LEAN Pre-Workout with organic caffeine derived from green coffee beans (as PurCaf®). On the molecular level, caffeine (chemically known as 1,3,7-trimethylxanthine) is an alkaline, organic substance derived from xanthine — a biologically important purine base found in many bodily tissues and fluids. Methylxanthines like caffeine and theobromine stimulate the central nervous system (CNS) and heart to promote wakefulness and motivation.

Numerous studies have shown that taking caffeine before exercise can significantly improve overall performance, largely by reducing the rate of perceived exertion [23]. Caffeine may also enhance endurance and strength by increasing fatty acid oxidation and sparing muscle glycogen [24].

L-Theanine | 180 mg

L-theanine is an isomer of the amino acids L-glutamate and L-glutamine. It was discovered centuries ago as one of the primary amino acids in green tea leaves and is also found in various mushroom species.

L-theanine is highly bioavailable when taken orally and actively traverses the blood-brain barrier to enhance mental acuity and attenuate stress [25, 26]. Its nootropic effects are appropriately described as "alert relaxation," which is to say it promotes a sense of calmness while improving focus. L-theanine can also help take the edge off of stimulants, particularly caffeine. In fact, research shows that pairing L-theanine with caffeine creates a nootropic synergy that bolsters cognitive function and alertness more effectively than taking either nootropic on its own [27].

Theobromine | 50 mg

Theobromine is the primary alkaloid found in cocoa beans and is essentially the “little brother” of caffeine. Its functions in the body are suggested to be complementary to those of caffeine, acting as a phosphodiesterase inhibitor and central nervous system stimulant [28].

Research has also found that theobromine has differential contributions to mood and cognitive function compared to caffeine, providing further insight into the distinct yet synergistic nature of these naturally occurring stimulants [29].

BioPerine® | 5 mg

BioPerine® is a patented black pepper (Piper nigrum) fruit extract standardized for its piperine content. Piperine is a natural alkaloid known for its “bioenhancer” properties, improving the bioavailability of molecules that are typically poorly absorbed or extensively metabolized in the liver [30, 31]. Hence, BioPerine® helps your body better absorb and utilize the other active ingredients in LEAN Pre-Workout.

Huperzine A | 100 mcg

A recent research review contends that huperzine-A, a constituent of the Chinese folk medicine Huperzia serrata, is a good therapeutic candidate for cognitive decline [32]. This natural nootropic may help boost memory and improve cognitive function by reducing the breakdown of acetylcholine [33].

How to Use

For Beginners to Pre-Workout Supplements

To assess tolerance, mix 1/2 scoop of Transparent Labs Lean Pre-Workout with 6 to 8 oz of water and consume 20-30 minutes before exercising, preferably on an empty stomach. If the effects feel subtle, increase to a full scoop before the next workout.

For Experienced Pre-Workout Supplement Users

Mix 1 full scoop of Transparent Labs Lean Pre-Workout with 10 to 12 oz of water and consume 20-30 minutes before exercising, preferably on an empty stomach.

Third-Party Testing

Please click below for third-party testing results from the most recent batch of Lean Pre-Workout:

FAQs

How Much Caffeine Does LEAN Pre-Workout Have?

Each serving contains approximately 162 mg of caffeine from organic green coffee beans (180 mg at 90% caffeine).

Can I Take Lean Pre-Workout on Non-Training Days?

Yes, you can take Lean Pre-Workout on non-training days if you want an energy boost. However, remember that this product contains caffeine and may cause restlessness if taken within 5 hours of bedtime.

Can I Take LEAN Pre-Workout if I am Subjected to Drug Testing for my Sport?

Yes, absolutely. Transparent Labs Lean Pre-Workout contains zero banned substances and is Informed Choice certified for athletes.

Why Doesn't LEAN Pre-Workout Contain Creatine?

Large doses of caffeine may interfere with the ergogenic effects of creatine [47]; since Lean Pre-Workout contains caffeine, we decided to keep the creatine separate.

What is the Difference Between Transparent Labs BULK, LEAN, and STIM-FREE Pre-Workouts?

Bulk is designed to support lean muscle growth and includes testosterone-supporting micronutrients, while Lean is designed to support fat loss and includes a thyroid support complex. Stim-Free, as the name suggests, contains zero stimulants and has added elevATP® for energy production.

I Don't Live in the United States, Can I Still Buy PreSeries LEAN?

Yes - our fulfillment center allows us to ship worldwide (with some exceptions due to fraudulent activity in certain countries; see here for more info). Standard shipping for international orders typically takes 10-14 business days to arrive.

Does this Product Contain Nuts?

No! While Transparent Labs Lean Pre-Workout is manufactured in a facility that processes nuts (coconuts and peanuts), we have an allergen control program that requires sanitization and cleaning of the manufacturing equipment to avoid cross-contamination of allergenic and hypoallergenic materials.

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Body Recomp - Stim-Free Fat Burner

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Dopamine+

Sleep & Recover - Melatonin Free

Omega 3

Lean Pre-Workout