Overview 

Transparent Labs STIM-FREE Pre-Workout is for gym-goers and active individuals who exercise later in the afternoon/evening and those who are sensitive to stimulants like caffeine. Alternatively, you might be taking a "stim break" and looking to cut back on caffeine. In either case, this non-stimulant pre-workout formula has you covered with an evidence-based lineup of clinically dosed ingredients, coming in at a whopping 17 grams per serving!

Combine that with fully transparent labeling, great flavor, and absolutely no artificial color/food dyes, artificial sweeteners, or artificial flavoring, and it's no wonder STIM-FREE Pre-Workout has become a fan favorite.

Key Features

• Stimulant-Free Pre-Workout Formula Backed by Science: Ideal for those sensitive to caffeine and nighttime gym-goers, Transparent Labs STIM-FREE Pre-Workout is formulated with clinically effective dosages of ergogenic ingredients to enhance your athletic performance without stimulants.

• Enhances Strength, Stamina, and Muscle Pumps: With an unmatched blend of clinically dosed nitric oxide boosters, STIM-FREE Pre-Workout bolsters muscle strength, endurance, and blood flow starting from the very first scoop.

• Promotes Clean, Lasting Focus, Drive, and Energy: Get dialed in for every workout with evidence-based nootropics like taurine, L-tyrosine, and huperzine-A. Since this is a stimulant-free formula, it won't give you jitters or cause a post-workout crash.

• Naturally Flavored and Sweetened with Stevia: Most non-stim pre-workouts are loaded with artificial colors, sweeteners, and flavors. We know you care about what you put in your body, so STIM-FREE Pre-Workout contains only natural flavoring and stevia instead of the hidden junk you find in other pre-workout supplements.

• 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

L-Citrulline Malate (2:1) |8,000 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 []. 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 [, ]

• Elevating nitric oxide levels even more than equivalent doses of L-arginine []

• Enhancing muscle anabolism and reducing muscle catabolism []

Beta-Alanine | 4,000 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 [].

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) []. 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 []

• Increasing overall muscle strength [] 

• Improving muscle endurance and total work capacity []

• Reducing and combatting the formation of dysfunctional proteins and promoting the formation of healthy proteins []

• Significantly increasing lean muscle mass as part of a diligent resistance-training program []

*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 | 2,500 mg

Betaine, also known as trimethylglycine, is a biologically important osmolyte and methyl donor. Betaine supplementation has been shown to improve strength gains and, to a lesser extent, endurance capacity in athletes [, , ]. Though the mechanisms are not entirely clear, Pre-workout betaine use ostensibly promotes athletic performance by maintaining cellular hydration and reducing homocysteine levels, thereby supporting cardiovascular health [].

Taurine | 1,300 mg

L-taurine is a non-proteinogenic amino acid often considered essential to pre-workout supplementation due to its diverse benefits for athletes and gym-goers. For one, taurine is a potent nootropic that promotes focus and attenuates brain cell inflammation and oxidative stress [, ].

Taurine can also enhance physical performance via increased blood flow to skeletal muscle tissue [, ]. Greater blood flow to muscle tissue encourages a favorable milieu for muscle function and recovery during training. Additionally, taurine supplementation has been shown to improve performance in endurance athletes [].

L-Tyrosine | 1,000 mg

L-tyrosine is a conditionally essential amino acid and precursor to dopamine and norepinephrine, two neurotransmitters that govern motivation and reward. Research shows that supplementing with L-tyrosine can significantly enhance cognitive performance and increase alertness, especially under acute stress (such as intense training) []. L-tyrosine has also been shown to improve “cognitive flexibility,” meaning it can help you adapt to dynamic cognitive demands without letting extraneous thoughts undermine your focus [].

Senactiv® 50mg

SenActiv® is a patented adaptogenic herb combination featuring Panax notoginseng and rose hips (Rosa roxburghii). The Panax notoginseng in SenActiv® is highly concentrated in ginsenoside R1, a beneficial constituent that helps accelerate muscle recovery and reduce fatigue during/after intense exercise. Likewise, the rose hips in this ingredient provide several ginsenoside-like molecules that confer synergistic recovery-enhancing effects with ginsenoside R1 []. These phytonutrients are suggested to work by bolstering a cellular "cleaning" process known as autophagy, particularly in skeletal muscle cells [, , ].

elevATP® Ancient Peat and Apple Fruit Extract | 150 mg

ElevATP® is a clinically researched combination of  “ancient peat” (fossilized plants) and apple skin extracts. Using innovative biotechnology, elevATP® stimulates your body’s endogenous production of adenosine triphosphate (ATP), the veritable energetic currency of cells.

By boosting ATP production, ElevATP® can help promote athletic performance (e.g. max strength) and improve body composition [, ]. ElevATP® is also a fast-acting ATP booster that starts working from the very first dose [].

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 [, ]. Hence, BioPerine® helps your body better absorb and utilize the other active ingredients in Bulk Black Pre-Workout.

Huperzine A | 100 mcg

Huperzine A is a naturally occurring alkaloid found in the Chinese club moss Huperzia serrata. It has gained prominence in the world of cognitive enhancement for its ability to inhibit acetylcholinesterase, an enzyme that breaks down acetylcholine in the brain. Acetylcholine is a key neurotransmitter involved in muscle contraction, arousal, sleep, and cognition.

By inhibiting its breakdown, huperzine A helps to maintain higher levels of cholinergic transmission, leading to improved mental focus, increased alertness, and better memory retention []. These effects make it a valuable addition to non-stim pre-workouts.

How to Use

For Beginners to Pre-Workout Supplements

To assess tolerance, mix 1/2 scoop of Transparent Labs STIM-FREE 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 Stim Free 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 Stim Free Pre-Workout:

FAQs

What is Stim-Free Pre-Workout Used For?

Our stim-free pre-workout is designed to increase power and endurance by improving blood flow and supporting muscle growth and recovery. It's ideal for those who train in the afternoon or evening or are sensitive to caffeine/stimulants.

Is a Stim-Free Pre-Workout Better than a Stim-Based Pre-Workout?

Choosing between stim-free and stim-based pre-workout depends on your personal needs and tolerance for stimulants, notably caffeine. Many people admittedly love the jolt of wakefulness and increased vigilance that caffeine provides, and are more likely to perform well in the gym because of that.

Obviously, the psychotropic rush you feel after taking a stim-based pre-workout will not be as apparent when taking a non-stim pre-workout. But if you work out later in the day, a stimulant-free pre-workout may be the better option so it doesn't interfere with your sleep.

Will Stim-Free Pre-Workout Keep Me Up at Night?

No, this formula contains 100% non-stimulant ingredients and won't cause restlessness.

Can You Take Stim-Free Pre-Workout Every Day?

Yes, it's safe to take our non-stim pre-workout daily as long as you adhere to recommended dosages. Our product is formulated with safe levels of each ingredient and is free from harmful additives, ensuring consistent performance benefits.

How Does Non-Stim Pre-Workout Feel?

If you've never taken a pre-workout supplement, Transparent Labs STIM-FREE will likely make you feel a little "tingly" under the skin for the first 15-20 minutes. This is due to the beta-alanine in the formula, but don't worry—it's harmless. You may also notice that your muscles feel and look fuller due to an increase in nitric oxide (which dilates the blood vessels).

Does Non-Stim Pre-Workout Help Build Muscle?

It sure can; the ingredients in our STIM-FREE Pre-Workout can help you train harder and longer, resulting in enhanced muscle gains (assuming you're eating a proper muscle-building diet).

I am Subjected to Drug Testing for my Sport; Can I Take Stim Free Pre-Workout?

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

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

PreSeries BULK is designed to support lean muscle growth and includes testosterone-supporting micronutrients, while PreSeries LEAN is designed to support fat loss and includes a thyroid support complex. PreSeries 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 ). 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.