The Best Stim-Free Pre-Workout (2026): Amp Up Your Workouts Without the Caffeine Crash

Swolverine PRE is a clinically dosed pre-workout that’s an excellent choice for those looking to avoid stimulant-based formulas. Each ingredient is carefully chosen to support energy and hydration without causing the jitters that come with high servings of caffeine. All of these factors help Swolverine PRE top our list of the best stim-free pre-workouts currently on the market.

GGR product tester Anthony O’Reilly, CPT, CNC, tested Swolverine PRE and gave it 4 out of 5 stars for the flavor. He tested Mango Lemonade, which is the only flavor available at the time of writing.

“It’s more mango than lemonade,” explains Anthony. “It’s pretty refreshing, and since it’s non-stim, I’ve often used it for focus on long drives or when I have to do lots of work but don’t want to feel over-caffeinated.”

Taste aside, the formulation truly shines with this pre-workout profile. To start, it contains 5,000 milligrams of citrulline malate, which is the combination of L-citrulline (a non-essential amino acid) and malate. A 2021 critical review¹ suggests citrulline malate directly influences nitric oxide (NO), which may improve skeletal muscle function and performance by enhancing blood flow, contractility, and mitochondrial respiration, which is a fancier word to describe energy production with the help of oxygen. 

Other key ingredients of the formulation—like 3.2 grams of beta-alanine², 2.5 grams of betaine anhydrous³, and 1.2 grams of taurine⁴—help delay the onset of physical fatigue, increase overall strength, enhance overall muscle endurance and focus, support muscle growth, improve body composition, and delay next-day muscle soreness.

“It contains a great combination of the most research-backed and common pre-workout ingredients at decent doses. Formulations like these are important for stim-free pre-workouts. Also, no artificial sweeteners or ingredients is always a plus,” adds registered dietitian Destini Moody.

It also contains coconut water powder to support hydration, and eleuthero root extract, or Siberian ginseng—an adaptogen that may support mental focus and clarity¹⁵.

Anthony gave this 4 out of 5 stars for the effects, saying, “It’s stim-free, so no energy, but the pump is decent and you get some mental focus.”

Each ingredient is clearly listed on the transparent label, which means that Swolverine tells you exactly how much of each ingredient you’re getting. We love to see this sort of transparency, and we give Swolverine PRE 5 out of 5 stars for the formulation.

Our only minor callout is the price per serving, which earns 3 out of 5 stars. You get 25 servings for $49.99, which brings the cost per serving to $1.99, although you can save 15% by setting up a subscription through Swolverine.

If you’re looking for a vegan-friendly, non-GMO, gluten-free, soy-free pre-workout with a great formulation, Swolverine PRE is worth a try.

Transparent Labs Stim-Free Pre-Workout is a vegan-friendly, non-caffeinated performance formula that relies on clinically effective ingredients and dosages. And if there’s one thing we know about Transparent Labs supplements, besides their commitment to transparency, they’re strategic about their formulation and only use purposeful ingredients. 

Both GGR Director of Content Nicole Davis and GGR Senior Staff Writer Amanda Capritto have tried Transparent Labs Stim-Free pre-workout, giving it an overall 3 out of 5 for taste. Nicole tried Fruit Punch (which isn’t currently available) and thought that it had a slightly chemical taste. Plus, it also got very foamy when shaken, which she thought was weird. 

Amanda tried Cherry Limeade (which has since been replaced by Grape Limeade) and thinks that it’s tart but not overly sweet, which is something she appreciates. She did have some issues with solubility, though, getting persistent chunks (even with a shaker bottle). 

The “star child” of Transparent’s stim-free formula is the 6,000 milligrams—or 6 grams—of citrulline malate, which is the combination of L-citrulline (a non-essential amino acid) and malate. A 2021 critical review¹ suggests citrulline malate directly influences nitric oxide (NO), which may improve skeletal muscle function and performance by enhancing blood flow, contractility, and mitochondrial respiration—or just a fancier word to describe energy production with the help of oxygen. 

Other key ingredients of the formulation—like 4 grams of beta-alanine², 2.5 grams of betaine anhydrous³, 1.3 grams of taurine⁴, 1 gram of L-tyrosine⁵, and 500 milligrams of choline bitartrate⁶—help delay the onset of physical fatigue, increase overall strength, enhance overall muscle endurance and focus, support muscle growth, improve body composition, and delay next-day muscle soreness. It also contains branched-chain amino acids (BCAAs)—specifically 2:1:1 of leucine, isoleucine, and valine—that prove to be the ideal ratio and what the GGR team looks for in the best BCAA supplements. 

But there’s more: The stim-free pre-workout supplement contains other unique ingredients such as Huperzine A to increase cognition and focus, as well as BioPerine® to enhance the absorption of other available nutrients. It also provides sodium and potassium⁷ to boost the pump even more and promote hydration. 

The stim-free pre-workout contains beetroot powder intended for natural color according to the product label. However, research⁸ tells us beetroot can also stimulate NO production and improve exercise performance. 

So, we guess you could say Transparent Lab’s stim-free pre-workout is stacked with research-backed ingredients. If you enjoy reviewing the data just as much as we do, be sure to check out their site’s “Ingredients” tab to access more research on their selected ingredients. 

Ingredients aside, all eight delicious flavors are naturally flavored, colored, and sweetened with stevia. This means no use of artificial sweeteners, artificial coloring, and no artificial preservatives—just high-quality and third-party-tested ingredients.

“Also, this contains 4 grams of beta-alanine so the tingles are intense,” Amanda says. “I get really itchy lips and fingertips for 10 to 15 minutes before it dies down. I’m used to it now, but at first I was taken aback and it took some courage to try it a second time.”

You can check out our in-depth look at the supplement in our Transparent Labs Stim-Free Pre-Workout review.

Nothing screams “all-natural” more than Legion’s stim-free, pure pre-workout formula. Pulse actually comes in caffeinated and non-caffeinated options, both with a minimalist formula of clinically proven ingredients.

Sweetened with erythritol, Pulse has no artificial flavors, dyes, or fillers. Several people on our team have used Pulse more than a dozen times before workouts that include HIIT and weightlifting. Jacob Penner, personal trainer and USA Weightlifting L-2 coach, and Nicole Davis, GGR Director of Content and certified nutrition coach, both rated the taste of Pulse highly, giving a 5 out of 5 and 4 out of 5, respectively.

Other functional ingredients of the stim-free pre-workout include L-citrulline malate¹ (8 grams), 300 milligrams of choline⁶ to increase power, 3.6 grams of beta-alanine² to minimize muscle fatigue, and 2.5 grams of betaine³ for improved muscular endurance. 

Legion Pulse Naturally Sweetened & Flavored Stim-Free Pre-Workout is third-party tested through Labdoor, which certifies that there are no banned substances in the powder. We place a priority on products that are third-party tested when it comes to what we determine to be the best, because it means we can trust the label.

In our testing, we found Pulse to be highly soluble, giving it a 5 out of 5. “It mixes well,” says Jacob. “I didn’t have to keep shaking my cup before every drink, like you have to do with some pre-workouts.”

This is one of the most expensive pre-workouts on our list. It’s typical for all-natural, third-party tested pre-workouts to have higher price points than their peers. However, at $2.50 per serving, Pulse is even higher than normal. If you choose to subscribe and save, your price per serving drops to $2.25, which is much more palatable. Your options include shipping every 30, 60, or 90 days.

Read more in our Legion Pulse Naturally Sweetened & Flavored Pre-Workout.

Kaged Pre-Kaged Stim-Free might be stim-free, but it is stacked with ingredients that can help take your workouts to the next level. It also bundles and breaks down the intended function of the ingredients—like “pump” and “muscle fuel matrix”—so you better understand what to expect out of your workout. 

L-citrulline¹ will provide your “pump,” while the branched-chain amino acids—leucine, isoleucine, and valine—will act as “muscle fuel.” BetaPower® (betaine anhydrous), Carnosyn® (beta-alanine), and Creatine HCl® (patented creatine hydrochloric acid) activate strength and power. 

Although creatine monohydrate is the most common creatine on the market, creatine HCl is up and coming. Growing data¹³ suggests that while both forms of creatine can improve athletic performance and strength, creatine HCl is 41 times more absorbable and promotes favorable changes in body composition. 

The non-stim pre-workout also provides “neuro-focus” ingredients—like taurine⁴ (2 grams) and L-tyrosine⁵ (850 milligrams)—and “hydrate and defend” blends using coconut water powder and SPECTRA™ Total ORAC Blend. The SPECTRA™ is supposedly a premium antioxidant of 20+ fruit and veggie extracts—like tomato concentrate, carrot concentrate, blackberry concentrate, and kale concentrate—to fight inflammation and support metabolic health. 

This caffeine-free pre-workout is naturally flavored and contains 1 gram of sugar. It is likewise free of artificial flavors, colors, gluten, and GMOs. 

Former GGR Performance Editor Anthony O’Reilly tried the now-discontinued Cherry Bomb flavor of Pre-Kaged Stim-Free, and while he says that the flavor could be better, the effects are worth it. “The pump is strong with this one! Holy hell, I was working to a heavy top set after taking this, and the after-effects were very apparent,” he says in our Kaged Muscle Pre-Kaged review. “I hate that there are only 20 servings and the scoop is VERY large compared to other pre-workouts, but that’s because there are quite a few compounds in here. I love having this for afternoon workouts.”

RELATED: Best Creatine Supplements

At $2.24 per serving, Pre-Kaged Stim-Free is pricey, but it’s worth it for all of the benefits it provides.

Huge Supplements Pump Serum Non-Stim is claimed as a “powerful stim-free pre-workout supplement formulated to optimize pump, muscle fullness, training capacity, and focus.” It’s intended to intensify your workout performance thanks to the combination of 13 potent and some active ingredients. But what makes it the best stim-free pump pre-workout?

Starting with the more familiar ingredients, the non-stim pre-workout supplies L-citrulline¹ (a whopping 8,000 milligrams) and choline⁶ (980 milligrams). Choline is an essential nutrient needed to produce acetylcholine, an important neurotransmitter for brain and nervous system functions like memory, mood, and muscle control. Because intense exercise can stress the pathways of choline, research⁶ suggests that choline supplementation may increase exercise endurance. 

The non-stim pre-workout contains a variety of patented ingredients like Nitrosigine®, GlycerPump, VasoDrive-AP, Huperzine A, and Bioperine. GlycerPump is a glycerol powder, and glycerol supplementation¹⁰ can have a positive effect on aerobic and anaerobic performance. 

Also new to our line-up, the non-caff pump powder also contains agmatine¹¹, which can help boost nitric oxide. Other nutrients—like L-tyrosine⁵, sodium⁷, and pomegranate and beetroot extracts⁸—are also used to enhance exercise performance and recovery. 

VasoDrive-AP helps increase the production of endothelial nitric oxide synthase (eNOS)¹², which is responsible for most of the nitric oxide produced in the body. This vasodilation action may boost exercise performance by providing an intra-workout pump, reducing muscle soreness and exercise-related fatigue, and improving recovery. 

Huge Supplements Pump Serum Non-Stim also meets quality standards and is manufactured in an FDA-registered facility based in the U.S. But with exotic flavors like Strawberry Mojito and Island Dream, you’ll feel as if you’re transported to the tropics! 

Our tester, USA Weightlifting Level 2 Coach and member of GGR’s expert panel Jacob Penner, tried Cherry Berry and liked the experience overall. “It isn’t incredibly tart, but it is definitely sweet. Instructions say to mix it with 8 to 12 ounces of water; that made the taste too concentrated, so I mixed it with about 20 ounces and it was better. You definitely feel a pump!”

RELATED: Huge Supplements Discount Code

RAW Nutrition Pump is our top budget-friendly non-stim pre-workout. One container is $40, and contains 40 servings, which means you’re paying $1 per serving. If you subscribe-and-save, the price drops to just 90 cents per serving.

Lauren Strong, former GGR Staff Writer and certified personal trainer, and her husband both tested RAW Pump.

“I got a good pump, but I don’t like this for my fasted morning workouts, so my husband has been using it,” Lauren said, noting that taking this on an empty stomach wasn’t pleasant. “My husband lifts after work and used to have a hard time falling asleep from CNS stimulation on top of pre-workout effects. The stim-free has actually been a decent solution for him.”

In one scoop of Pump, you’ll get 2.5 grams of betaine anhydrous³ and 750 milligrams of taurine⁴ to maximize your pump and recovery. This might be a slightly low dose, as betaine anhydrous shows to be safe in doses of up to 3,000 milligrams twice daily while 3,000 milligrams per day of taurine shows to be safe and effective. 

Aside from betaine and taurine, Pump provides additional ingredients like:

• Nitrosigine® (L-arginine that has been stabilized by inositol): Research published in the Journal of the International Society of Sports Nutrition⁹ shows that inositol-stabilized arginine can significantly increase pre-workout energy and muscle pump post-workout while decreasing muscle damage. 

• L-citrulline: This amino acid turns into l-arginine, another amino acid, in the body, which boosts the production of nitric acid that then works to widen the blood vessels and improve blood flow.

• Beta-alanine²: This amino acid has been shown to aid in reducing muscle fatigue and improving anaerobic exercise capacity.

We should point out that ingredients like beta-alanine appear under-dosed; there is only 1 gram per 1 scoop. “I didn’t have any tingles,” reports Lauren, who was excited that she didn’t experience that common side effect that pre-workouts with higher dosages often have.

The non-stim pump powder provides the minerals and electrolytes sodium (via Pink Himalayan salt) and potassium⁷. 

While the Pump powder provides some pretty rad ingredients (and flavors), it’s worth noting that it does contain artificial flavors and sweeteners like sucralose.

Lauren and her husband gave the taste of RAW Nutrition Pump a 4 out of 5. “It’s okay! Pretty fruity, sweet, but also not so sweet,” she says. “I appreciate that it’s not ultra fake-tasting or made-up flavors like unicorn dust. In other words, you won’t have to gag this down.”

Former GGR Performance Editor Anthony O’Reilly and USA Weightlifting Level 2 Coach Jacob Penner both compared the Blue Raspberry flavor of Genius Pre to a blue icee (like the ones you’d get at a gas station or convenience store). “Taste-wise, this is one of the best pre-workouts I’ve ever had, and I’ve had 50+ pre-workouts,” says Jacob. Anthony agrees with him, too. “I think this is the best blue raspberry-flavored anything I’ve ever tried, and it’s certainly at the top of my list for best-tasting pre-workout, stim or non-stim.”

Not a fan of Blue Raspberry? Genius Pre is also available in Grape Limeade, Sour Apple, and Sour Cherry.

Enough about the taste, you want to know if this stim-free pre-workout can get you pumped for the gym, both figuratively and literally. The answer to both is yes, with a caveat. Anthony and Jacob said this non-stim pre-workout differed from others they took in the effect they felt after drinking it.

“Very calm focus,” Jacobs says. “It almost felt like taking a mood stabilizer, because I was relaxed, not stimulated; clear, and ready to take action.” Anthony felt similar effects. “I’ve rarely been as ‘locked in’ as I am when taking Genius pre-workout,” he says.

This is probably due to the nootropics added to Genius Pre, which have been shown to help improve cognitive function and memory¹⁴. Genius also comes with physical benefits thanks to the 6 grams of nitric oxide-boosting L-Citrulline Malate^,1 though Anthony and Jacob noted that their pump didn’t last nearly as long as the euphoric-like state.

For more, check out our Genius Pre-Workout review.

BPN Endopump is a stim- and creatine-free formula claiming to provide stronger muscle pumps, increased nitric oxide, and improved blood flow. If you’re a beginner to pre-workout, this is a solid place to start because it offers an affordable price tag and doesn’t contain beta-alanine, which can stimulate a fairly intense tingling sensation on your face and skin.

GGR expert panelist Jacob Penner, tested BPN Endopump and noticed better muscle stamina and pump from this stim-free formulation. “I felt an increase in energy without the effects of stims,” says Jacob.

A quick look at the ingredients lists shows two pre-workout classics: L-citrulline¹ and betaine nitrate³ both of which have been proven to help with decreasing muscle fatigue and increasing strength.

“I got a good pump, but nothing beyond what I normally get with a traditional pre-workout (with caffeine). However, I think someone fairly new to pre-workout will experience a noticeable increase in blood flow,” Jacob adds.

BPN Endopump tastes good, too. Jacob tested the Blue Raspberry flavor and reports it’s not overly sweet or too tart. Other flavors include Prickly Pear, Blackberry Lemonade, and Sour Watermelon.

If you’re an endurance athlete, you’ve likely enjoyed the energy boost from a pre-run coffee. But you’ve also likely experienced those unwelcome gurgles that run you right into the bathroom (and hopefully in time).

Leave those bathroom runs in the dust with the help of running fuel and 1st Phorm’s Endura-Formance non-stim pre-workout. It’s formulated to energize muscle fibers with more power and stamina—and truly surge endurance performance—thanks to the coupling of creatine monohydrate¹⁴ and beta-alanine² synergized with other well-studied ingredients.

Aside from creatine and beta-alanine, Endura-Formance includes a powerful blend of betaine anhydrous³, Peak02™️, and S7® ingredients. Peak02™️ is a mushroom blend—like Lion’s Mane and Reisha—while S7® is a blend of various antioxidant extracts like blueberry, broccoli, and kale. This combination is said to maximize oxygen and nutrient delivery to the muscles and fight muscle fatigue for optimal muscle power output and endurance. 

The non-stim formula also provides sodium and potassium⁷ to enhance hydration and muscle function. It’s also worth noting that while the active ingredients are sourced from natural products, it does contain artificial flavors and the artificial sweetener sucralose.

And if you’re wondering about the testing protocols, you’ll have to dig a bit deeper beyond the product page. However, 1st Phorm’s official process page clears the air regarding their commitment to quality and expresses, “All 1st Phorm products have been, and will continue to be, produced only in facilities that are FDA-inspected, SQF Level-3 certified, & cGMP (Current Good Manufacturing Practices) compliant.” Dig even more and 1st Phorm confirms that all of their supplements are third-party tested.  

GGR Senior Staff Writer and expert product tester Amanda Capritto really enjoys Endura-Formance, and that’s saying something, as we’ve tested supplements out the wazoo! She loves the taste and solubility, and says overall, this pre-workout has been a great addition to my supplement stack. “I love taking this before all types of workouts, but especially endurance workouts since it has ample sodium,” she says in our 1st Phorm Endura-Formance review.