Strawberry Lemonade
Stim-Free Pre Workout
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Stim-Free Pre Workout

Clinically dosed, stimulant-free pre-workout formula to boost strength, endurance, and blood flow without jitters—ideal for evening workouts.

No Artificial Sweeteners

No Artificial Sweeteners

Gluten-Free and Non-GMO

Gluten-Free and Non-GMO

No Artificial Coloring

No Artificial Coloring

No Artificial Preservatives

No Artificial Preservatives

4 Flavors Available:

Third-Party Testing

We believe trust is earned through transparency. That’s why we provide full access to our third-party test results, so you can feel confident in what you’re taking. View all third-party tests.

Transparent Labs STIM-FREE Pre-Workout provides clinically effective doses of premium, stimulant-free ingredients including Citrulline Malate, Beta-Alanine, Betaine, Taurine, and nootropics to enhance strength, endurance, pumps, and focus. Designed specifically for athletes training later in the day or individuals sensitive to stimulants, this formula supports peak performance without causing jitters or sleep disruption.


Naturally flavored, sweetened with stevia, and free from artificial additives, STIM-FREE Pre-Workout delivers clean energy and exceptional results every workout.

Orders in the US over $99 ship free.

Once your order has shipped out from our fulfillment center, you will receive a Shipping Confirmation email. If you selected a tracked shipping method, you will receive your tracking information, along with the necessary steps to track your order, within this email. Please note, orders are generally fulfilled same day or next business day.

Click here for the full shipping and delivery guide »

45 Day Satisfaction Guarantee

If you are not satisfied with your product, we will offer you a full refund or store credit for the value of the item within 45 days of delivery.

Click here for the full refund policy »

why use Stim-Free Pre Workout?

This stimulant-free pre-workout formula enhances athletic performance, promotes muscle pumps, and sharpens mental focus without caffeine or other stimulants.

Boost Strength & Endurance

Clinically dosed ergogenic ingredients to enhance muscle strength, endurance, and power output.

Boost Strength & Endurance

Intensify Muscle Pumps

High-dose Citrulline Malate increases nitric oxide levels, significantly improving blood flow and muscle fullness.

Intensify Muscle Pumps

Clean Mental Focus & Energy

Nootropics like L-Tyrosine, Taurine, and Huperzine-A sharpen cognitive performance without stimulant-induced jitters.

Clean Mental Focus & Energy

Natural & Stimulant-Free Formula

Naturally flavored, sweetened with stevia, and free from artificial ingredients, ideal for evening workouts or stimulant-sensitive individuals.

Natural & Stimulant-Free Formula

Key Ingredients

Our formulas are made with clean, natural ingredients, with clinically-validated dosages to support health and performance.

L-Citrulline Malate (2:1)

8,000 mg

L-citrulline is a well-known nitric oxide booster that enhances blood flow, reduces muscle fatigue, and boosts endurance.

L-Citrulline Malate (2:1)

Beta-Alanine

4,000 mg

Beta-alanine is an amino acid that enhances muscular endurance, delays fatigue, and improves performance by increasing muscle carnosine levels.

Beta-Alanine

BetaPure™ Betaine Anhydrous

2,500 mg

Betaine Anhydrous keeps muscle cells hydrated, supports energy production, and boosts muscle endurance, strength, and overall performance.

BetaPure™ Betaine Anhydrous

Taurine

1,300 mg

Taurine is an amino acid, essential to nervous system function and helps prevent fatigue during intense exercise.

Taurine

L-Citrulline Malate (2:1)

8,000 mg

L-Citrulline malate is an amino acid that enhances physical endurance due to its role in the synthesis of nitric oxide (NO) . [1]

When nitric oxide production increases, blood flow improves, allowing nutrients and oxygen to replenish muscle tissue more efficiently. This translates to greater muscle pumps and heightened energy levels.

Numerous studies have demonstrated the performance-enhancing effects of L-citrulline malate such enhancing strength, muscle power output, anaerobic and aerobic capacity [2, 3, 4]

Additionally, studies indicate that L-Citrulline Malate reduces muscle soreness and enhances immune responses during the post-exercise period, supporting recovery from physical training [5].

L-Citrulline Malate (2:1)

Beta-Alanine

4,000 mg

Beta-alanine is an amino acid that functions as a precursor to carnosine, a molecule that accumulates in skeletal muscle tissue, where it plays a crucial role in buffering the acid produced during intense physical exercise. 

Supplementing with Beta-alanine has been shown to increase muscle carnosine levels, which are quickly depleted during intense exercise [6, 7].

Research shows that supplementing with Beta-alanine can significantly improve overall exercise capacity including maximal strength and power output, particularly in exercises requiring sustained maximal effort[8].  strength [9

Beta-alanine supplementation may also increase lean muscle mass [10] and delay the onset of neuromuscular fatigue [11, 12]

Beta-Alanine

BetaPure™ Betaine Anhydrous

2,500 mg

Betaine, also known as trimethylglycine, plays a role in various physiological processes, primarily as an osmolyte (helping cells maintain fluid balance) and a methyl donor (assisting in biochemical reactions). Betaine supplementation has shown promise in improving muscle endurance and enhancing strength and power in trained individuals [13, 14, 15].

While the mechanisms are not fully understood, Betaine supplementation may promote athletic performance through regulating cellular hydration, supporting creatine biosynthesis and playing a role in ATP (energy) production. [16]

BetaPure™ Betaine Anhydrous

Taurine

1,300 mg

Taurine is one of the most well studied performance aids offering diverse benefits for athletes and active individuals. Evidence indicates that adequate taurine levels are pivotal for central nervous system (CNS) function and may help prevent fatigue during arduous exercise. [17]

Taurine has been shown to be effective in enhancing both aerobic and anaerobic performance while also supporting recovery from exercise. [ 18, 19

Several studies have demonstrated that taurine supplementation can help delay time to exhaustion and decrease rate of perceived exertion making it an important ingredient for intense physical activity. [20, 21]

Taurine

L-Tyrosine

1,000 mg

Increasing tyrosine uptake may positively influence neurotransmitter-related psychological functioning. Research shows that supplementing with L-tyrosine can significantly enhance cognitive performance, especially under acutely stressful situations (such as intense training) [22].

L-Tyrosine has also been shown to improve “cognitive flexibility,” meaning it can help you adapt to changing cognitive demands without letting extraneous thoughts take over [23].

L-Tyrosine

SenActiv®

50 mg

The adaptogens that comprise SenActiv® are Panax notoginseng root and rose hips (Rosa roxburghii). The notoginseng in SenActiv® is highly concentrated in notoginsenoside R1, a beneficial compound that helps accelerate muscle recovery during/after intense exercise. 

Likewise, the rose hips provide several ginsenoside-like molecules that provide synergistic recovery-enhancing effects with ginsenoside R1 [24]. 

These phytonutrients are suggested to work by bolstering a cellular "cleaning" process known as autophagy, particularly in skeletal muscle cells [25, 26, 27].

SenActiv®

ElevATP®

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 [28, 29]. ElevATP® is also a fast-acting ATP booster that starts working from the very first dose [30].

ElevATP®

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]. 

BioPerine®

Huperzine-A

100 mcg

This natural nootropic is known for inhibiting acetylcholinesterase, thereby increasing acetylcholine levels, a neurotransmitter vital for learning and memory. 

A recent research review contends that huperzine-A, a constituent of the Chinese folk medicine Huperzia serrata, is a good  candidate to improve cognitive function and may help boost memory [32]. 

Huperzine-A

Complete Your Stack

Pair Stim-Free Pre Workout with these products for a complete foundational stack.
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Every Ingredient Matters To Make Every Effort Count.

Customer Reviews

Based on 1394 reviews
78%
(1081)
13%
(180)
7%
(99)
2%
(21)
1%
(13)
E
Eric Gunter
Stim-Free but same Pump!

I have always been skeptical of a non caffeine pre workout. However, switching to working at at night made me require a change as I couldn’t sleep after my workout! So I tried the Stim-Free pre workout. I was shocked at how I didn’t really feel any difference in my workout. No loss of reps and drop in weight. I was able to continue building without missing a beat from the switch in pre workout. I would highly recommend it to anyone who needs to avoid caffeine buts wants the added fuel to workout!

K
Kolby P.
Transparent Labs Stim-Free Pre-Workout Review: Cranked Up Without the Crack

I’ve tried a lot of pre-workouts over the years—some good, some bad, and some that make you feel like you’ve just mainlined lightning. Transparent Labs’ Stim-Free version falls somewhere in between, but not without some caveats. Let’s just say, if you’ve ever wondered what it feels like to be a Tesla coil in human form, this might get you close.

When I take this stuff, my skin feels like it’s short-circuiting. There's a weird electric buzz that makes me feel borderline methed out, which is ironic given the “stim-free” label. It’s an intense ride, and while I assume their main customer base is 16 to 30-year-olds chasing that cracked-out gym rat euphoria, that’s not everyone’s vibe.

Now here’s the kicker: I’m 40. I’m not looking to bench press the moon or chew drywall. I’m looking for clean energy, vascularity, and a solid pump without feeling like my soul is vibrating. That’s why I loved their now-discontinued product, Pump. It was everything a stim-free pre-workout should be—effective vasodilation, great muscle pump, and smooth, consistent energy that made workouts feel powerful but focused. No jitters, no tingling, just results.

TLDR: If you’re younger, chasing the stim dragon, or want to feel like you’ve plugged your nervous system into a car battery, Transparent Labs Stim-Free might be your jam. If you’re like me and want something a little more balanced and sustainable, Pump was the golden era—and its absence is felt.

J
Justin Keiser
Good, Not Outstanding like the one before Stim Free

You need to put the other one back in stock. This just isn't good enough as the one you stopped making before this one. I had way more energy with the other one. BRING IT BACK IN STOCK! Some of us Combat Vets need a good head rush with our workouts.

B
Brandon Smith
Exceeded expectations

Decided to cut caffeine out and bought a tub of the srim free pre workout. It exceeded my expectations. Love the beta alanine and the energy/pump I get even without the caffeine. Bought a second tub.

D
Don
"Natural Flavors"

I've been using TL's "Bulk" since 2018 and I've now just recently tried the Stim-Free; it never occurred to me they use "natural flavors" until recently.

This is easily the most fraudulent ingredient around, and can be comprised of many, many other ingredients. Not only is this inclusion not "transparent" at all--but is likely unclean.

TL has been incredible, generally, with their products, but this is disappointing. Maybe an explanation is found somewhere detailing what they mean by natural flavors? If they ever revamped this ingredient and made it actually transparent and clean, I'd think the positive buzz might make it worthwhile.

I'm not quite sure what to do about this product now. Very conflicting. TL, if you read this: please consider explaining this or revamping your ingredients.

How to Use

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Step 1 - Add Powder

Beginners: To assess your tolerance, add 1/2 scoop (included in the container) of Stim Free Pre-Workout into a shaker cup with 6-8 ounces of cold water or your preferred beverage. Experienced Users: Add 1 level scoop (included in the container) of STIM-FREE Pre-Workout into a shaker cup with 10-12 ounces of cold water or your preferred beverage. If the effects feel subtle, increase to a full scoop before the next workout.
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Step 2 - Mix Thoroughly

Place the lid securely on your shaker cup and shake vigorously until the powder fully dissolves and the mix is smooth.
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Step 3 - Consume

For best results, consume STIM-FREE Pre-Workout 20-30 minutes before your workout (ideally on an empty stomach or at least 90 minutes after a meal).
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Step 4 - Use on Training Days

Take Stim Free Pre-Workout before workouts on days you train.

Frequently Asked
Questions

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.

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.

Will stim-free pre-workout keep me up at night?

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

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).

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.

What is the difference between transparent labs bulk, lean, and stim-free pre-workouts?

Transparent Labs Bulk Pre Workout 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 while the Stim Free pre workout, as the name suggests, contains zero stimulants and has added elevATP® for energy production.

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.

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.

Will stim-free pre-workout keep me up at night?

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

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).

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.

What is the difference between transparent labs bulk, lean, and stim-free pre-workouts?

Transparent Labs Bulk Pre Workout 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 while the Stim Free pre workout, as the name suggests, contains zero stimulants and has added elevATP® for energy production.