Top 10 Best Caffeine-Free Pre-Workouts • (2024 Reviews)

Last Updated Feb 15, 2024

Getting all zooted up on caffeine before the gym is a dangerous game. In fact, I overlooked the caffeine in my first-ever preworkout and experienced some nasty jitters that cut my session short. Needless to say, I halved the dose after that debacle. Whether you enjoy a stim-free pre-workout or prefer to get your caffeine from other sources, you’ll find value in my ultimate list of the best caffeine-free pre-workout supplements.

In this guide, I share my top 10 caffeine-free preworkout picks, reviews, and a bonus buyer’s guide that explains why going caffeine-free is essential to maximizing pump and overall performance.

Brand Ingredients & Highlights
#1 Genius Pre
  • Experience a new level of laser focus with this nootropic preworkout that’s taking the fitness world by storm
  • Trademarked ingredients that are scientifically-proven to not only boost performance in the gym but results too!
  • elevATP™ – Enhance ATP energy production without creatine
  • CarnoSyn® – Supercharges your muscles to delay fatigue
  • AlphaSize® – Supports the mind-to-muscle connection like no other ingredient, take your form to peak levels!
  • AstraGin® – All-natural food ingredient that guarantees optimal absorption of the formula
  • No artificial flavors or junk sweeteners
  • No more worrying about quickly building a tolerance to the stims in now-ancient pre-workout supplements
  • Stacks well with Genius BCAA on the days you want caffeine
  • 100% Money-Back Satisfaction Guarantee
#2 Legion Pulse
  • Legion Pulse is another revolutionary nootropic pre-workout with very similar ingredients to Genius Pre
  • Tons of flavors to choose from, plus there’s a caffeinated version
  • L-Citrulline Malate, Alpha GPC, and Beta-Alanine rapidly boost Nitric Oxide before you enter the gym (N.O. is a vasodilator unlike caffeine)
  • CarnoSyn®
  • AlphaSize®
  • Natural sweeteners with no empty fillers
  • Money-Back Satisfaction Guarantee
#3 Type Zero Clean N.O. Booster
  • Ever heard of SuperBeets powder? Well, this stuff is a supercharged version of SuperBeets!
  • An unparalleled N.O. boosting combo of L-Arginine, Citrulline Malate, Beet Powder, Beta-Alanine, and pure Apple Cider Vinegar for ridiculous pumps during your workout
  • 100% Sugar-Free, Caffeine-Free, and Stimulant-Free
  • BioPerine® black pepper extract for enhanced absorption
  • 1g of GABA per serving to soothe your mind and boost focus
#4 Jacked Factory N.O. XT Nitric Oxide Boosting Agent
  • The perfect choice for people who aren’t a fan of powdered pre-workouts
  • A three-pronged approach to blast pumps, skyrocket endurance and maximize your strength during even the hardest gym sessions.
  • Contains the most advanced form of N.O.-boosting arginine on the market, NITROSIGINE®, an Inositol-Stabilized Arginine Silicate
  • N.O. XT stacks L-Citrulline and L-Glutathione with NITROSIGINE® for a simple, yet highly-effective formula that won’t cause dependency or a crash
  • Made in the USA with a money-back satisfaction guarantee
  • And if you’re over gelatin caps, these caps are all veggie
#5 Evlution Nutrition Pump Mode
  • Pump Mode stim-free pump accelerator is the preferred choice of top bodybuilders, and it’s sold for a budget price
  • Betaine Nitrate as NO3-T® is a special ingredient that coverts nitrate molecules in the body to Nitric Oxide, which equals more blood flow and enhanced oxygen utilization throughout the body
  • HydroMax® is the future of glycerol available now in Pump Mode
  • A healthy dose of Vitamins C & D nourishes your body to shorten recovery times and boost the immune system
  • 6 delicious flavors to choose from
#6 ALLMAX Nutrition Impact Pump
  • ALLMAX, the makers of my favorite weight gainer, produces one of the best stimulant-free preworkout supplements currently on the market
  • Contains Lion’s Mane mushroom powder that works to bolster mind-muscle connection for top-notch form and results
  • 6 grams of Citrulline Malate 2:1 and 1 gram of Glycerpump™ per dose to boost vascularity and enhance pumps
  • 100% Stim-Free and Caffeine-Free
  • A heavyweight formula built for men who want to extend their pumps to new heights all the while boosting testosterone!
  • CarnoSyn® Beta-Alanine, HydroMax® Glycerol Powder 65%, L-Citrulline (4g per serving)
  • L-Tyrosine to spike alertness, boost strength, and reduce blood pressure
  • Agmatine for a stim-free energy rush
  • Clinically-studied and patented “CFB” for all-natural testosterone support
  • Unflavored version available
#8 RSP Pump Boost
  • One of the best stimulant-free Nitric Oxide boosters available preferred by bodybuilders seeking to enhance pump with minimal ingredients
  • The most affordable pump accelerator pre-workout in my Top 10
  • A blend of L-Citrulline, HydroMax® Glycerol, and coconut water powder
  • The simple formula makes Pump Boost the best pre-workout in my Top 10 to stack with your other favorite supplements
  • Keeps your muscles hydrated and primed to endure long & intense training sessions
#9 Cellucor NO3 Ultimate
  • Cellucor, the maker of the popular C4 preworkout supplement, whipped up something extraordinary with its NO3 Ultimate extreme pump amplifier!
  • The ultimate arginine combination: NITROSIGINE®, Arginine Alpha-Ketoglutarate (AKG), and NO3-T®
  • NO3 Ultimate pairs 4g of L-Citrulline with its 3-ingredient arginine formula to further enhance NO production and boost pumps
  • 3 delicious flavors to choose from
#10 BSN N.O.-XPLODE Legendary Pre-Workout w/ Creatine
  • BSN threw everything but the kitchen sink into this power-packed formula!
  • Perfect for people who want creatine in their stim-free pre-workout
  • Combines 5 special blends that work together to enhance every facet of your workout: bigger pumps, more energy, more endurance, laser focus, and lit performance
  • 5.1-gram creatine blend per serving with AstraGin® for enhanced absorption
  • Experience an energy rush without caffeine

Buyer’s Guide and Reviews

Now that you’ve checked out the top 10 best caffeine-free pre-workout supplements currently on the market, let’s dive deeper.

In this section, I share reviews for several of my top picks along with a helpful buyer’s guide that explains why stim-free is the new caffeine.

Genius Pre

If you’re unfamiliar with the Genius Brand, it’s one of the more evolved supplement brands out there. Genius focuses on enhancing physical performance by unlocking the power of the mind. Genius took what bodybuilding supplement companies already know and made it even better.

Each serving of Genius Pre contains a whopping 6 grams of L-Citrulline Malate 2:1, 2 grams of Betaine, and 1 gam of L-arginine. The blend combines the power of these effective bodybuilding supplement ingredients with nootropics Huperzine A, L-tyrosine, and Rhodiola.

You may have also noticed that Genius Pre contains four trademarked ingredients that a lot of the other pre-workouts in my Top 10 offer. Bottom line, this stuff is loaded with goodies to enhance not only physical performance but the all-important mind-to-muscle connection.

  • Depending on how your body reacts to the ingredients, you may not feel the effects of this supplement and feel let down, especially at this price point.
  • You may experience a tingly feeling that hinders your workout.
  • There’s a chance you may feel fatigued after taking Genius Pre.
  • The flavor is certainly not for everyone.
  • You may experience a feeling similar to a niacin flush.
  • There’s a chance of experiencing nausea.
  • There’s a strong chance that the nootropics in this blend will take your focus level to the highest of highs.
  • Genius Pre is perfect to stack with caffeine supplements or caffeinated beverages on the days you want an extra jolt of energy.
  • Bigger pumps, more stamina, increased energy, and quicker recovery times are common with Genius Pre.
  • If you’re over 40, you may prefer Genius Pre over other popular pre-workouts that are loaded with stims.
  • Feelings of well-being
  • No tolerance equals a consistent effect without chasing the feeling you felt after the first use (a common problem with caffeinated pre-workouts)
  • An overall more productive workout
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Legion Pulse

Legion Pulse is essentially the same supplement as Genius Pre without the added nootropics. Legion also beefed up the L-citrulline, CarnoSyn, and Betaine Anhydrous dosages in its blend.

One thing I really like about Pulse is most users who tried C4 or MP Assault before Pulse prefer the effects of Pulse.

Like Genius Pre, the ingredients in Pulse have a consistent effect. With supplements like C4, people often end up having to double or even triple the dose before the stuff stops working altogether.

The drawback to Pulse is it’s not the best choice for people who are seeking a preworkout that focuses on boosting pumps. Pulse is best suited for people who are looking for a stim-free energy boost and effective – not best – N.O. boosting formula.

Lastly, Pulse is available in both caffeinated and non-caffeinated blends.

  • There appears to be a conflict between the old blend and the new blend. It’s critical to read the most current reviews before you buy it to confirm which ingredients are in the latest formula.
  • You may experience side effects such as headaches, drowsiness, tingly feeling, itchiness, brain fog, allergic skin reaction, upset stomach, and several others.
  • Be careful about which flavor you choose because it might not agree with your tastebuds.
  • The stim-free energy boost with this pre-workout supplement is the real deal. If you’re craving something to help you power through longer workouts without the caffeine, Legion Pulse may be your answer.
  • You may feel an unquenchable thirst to hit the gym.
  • Legion Pulse may help you break through plateaus.
  • You may find that 1 scoop is all you need, which doubles the life of a single jar.
  • No proprietary blends, only transparent dosages for each key ingredient
  • You might find that Legion Pulse is the best pre-workout without creatine.

Evl Pump Mode

For bodybuilders or aspiring bodybuilders who are looking to enhance their pump, look no further than Pump Mode. What I like the most about Pump Mode is it’s a no-nonsense formula with minimal ingredients for an affordable price.

Most bodybuilders like the freedom Pump Mode offers since it stacks well with other supps. The key ingredient Betaine Nitrate (as NO3-T®) is a cutting-edge Nitric Oxide booster that more and more bodybuilders are reaching for to get real results.

The main ingredients in Pump Mode boost blood flow and optimize oxygen delivery to the muscles. These are two of the keys to achieving intensified pumps.

  • There appears to be a quality control issue that’s causing the powder in some jars to clump and fizz.
  • You may find that the texture of the mixed drink is too chalky for your liking.
  • The flavor could be a dealbreaker for you.
  • If you’re hoping for a caffeine-free energy boost and are accustomed to the effects of caffeine, you may not experience a sufficient energy boost with Pump Mode.
  • The greatest advantage of Pump Mode is experiencing the pump you desire without the caffeine jitters.
  • The ability to extend your workouts
  • A noticeable difference in muscle size and fullness during your workouts
  • The low price compared to bigger-name supplements with jacked up prices
  • The effects start almost immediately after taking it, perfect to take right before a hard workout.
  • You may feel a surge in energy and a suppressed appetite.
  • Enhanced focus


Compared to other stim-free pre-workouts in my Top 10, NITRAFLEX is on the lighter side with similar ingredients to several of my other picks. For example, it contains a 4g dose of L-citrulline while others in my Top 10 offer 6 grams or more. Despite this slight shortcoming, I love the addition of the testosterone-boosting ingredient CFB.

On top of that, NITRAFLEX offers several additional ingredients not found in other blends, such as Agmatine for an all-natural energy boost. To even the mix out for a serious pump boost, GAT added HydroMax® Glycerol and CarnoSyn® Beta-Alanine.

All in all, the greatest selling point for NITRAFLEX is the T boost not offered by most other pre-workout supplements. It’s also one of the best creatine-free pre-workouts currently on the market.

Cellucor NO3 Ultimate

Did Cellucor deliver with its caffeine-free NO-boosting alternative to C4? C4, the most well-known Cellucor pre-workout supplement, has the disadvantage of tolerance. Most users love C4 until they realize that the effects quickly wear off after several uses.

The good news is there are no stimulants to build up a tolerance to in NO3 Ultimate. NO3 Ultimate is all about amplifying pumps through the power of boosting Nitric Oxide. If you’re a fan of arginine in your pre-workout supp, NO3 Ultimate is the most complete arginine formula in my Top 10 with three different types of arginine.

Cellucor also stands behind this supplement with a 30-day 100% money-back guarantee. This is more than most other lesser-known supplement companies offer.

  • Depending on how you react to the active ingredients, there’s a chance you’ll experience little to no pump.
  • If you’re craving energy from a stim-free pre-workout, there are better options.
  • The effects may not last long enough to push you through a long, hard workout.
  • You may experience an unbelievable pump during and after your workout.
  • Tastes better than most other similar supps
  • A potent fatigue fighter
  • The serious NITROSIGINE® dose gets the job done.
  • Mixes better than other pre-workouts
  • If you were let down by other pump enhancers, you may find that NO3 Ultimate gives you the pump you’re seeking.


Note: Be sure to check for the “Non Caffeinated” label in the bottom left corner of the main label to ensure you choose the stim-free version of N.O.-XPLODE

Stim-Free N.O.-XPLODE is the best caffeine-free pre-workout supplement with creatine in my Top 10. It contains five different blends: Myogenic Matrix, Endura Shot, Thermic Energy, N.O. Alpha Fusion, and Shock Composite.

The biggest drawback is each formula is a proprietary blend, so you don’t know exactly how much of each ingredient you’re getting per serving.

However, if you’re a fan of proprietary blends and on the hunt for a complete stim-free preworkout with creatine, there’s no better choice than caffeine-free N.O. Xplode. It covers all the bases from Nitric Oxide production to enhanced energy & focus.

  • There’s a chance of the new formula upsetting your stomach.
  • Cramps and nausea are reported N.O.-XPLODE side effects.
  • You may experience a tingling sensation in your skin that negatively impacts your workout.
  • As with all supplements, you may experience little to no positive effects with this formula.
  • The caffeine-free fruit punch flavor may not agree with you.
  • You may experience a sizeable energy boost that powers you through your workout.
  • Most people experience a noticeably larger pump after training on N.O.-XPLODE.
  • No jitters or crash
  • Increased focus, a solid creatine pump, and more endurance
  • Increased vascularity
  • Does not impact sleep at night

The Danger of Mixing Caffeine with Exercise

The BIGGEST reason to avoid caffeine before the gym is the fact that excessive caffeine intake restricts blood flow (it’s a vasoconstrictor). Since we want to increase blood flow for a serious pump, it’s vital to consider stimulant-free preworkout supplements that work as vasodilators.

One study found that caffeine reduces myocardial blood flow during exercise, which can cause serious repercussions including cardiac death (*). Ischemia and arrhythmia may occur even in young healthy adults when caffeine is combined with exercise.

As more people realize the dangers of training on caffeine, more people are reaching for stim-free preworkout supplements to get the same edge, minus the dangerous potential side effects.

The Problem with Caffeinated Pre-Workouts that Boost Nitric Oxide

Nitric Oxide is a potent vasodilator that’s beneficial to take before exercise (*). Caffeinated pre-workouts that aim to boost N.O. production have conflicting ingredients.

The vasoconstrictive effect of caffeine works against the vasodilatory effect that N.O.-boosting ingredients in a pre-workout supplement produce.

L-citrulline and L-arginine

L-citrulline is an effective and safe supplement that increases vasodilation. In older men, L-citrulline combined with L-arginine was shown to increase muscle blood flow (*).

These two amino acids are found in mostly all the stim-free pre-workout supplements in my Top 10 because of their effectiveness as vasodilators that enhance pump.

It’s important to reach for pre-workout supplements that contain both amino acids because the research for L-arginine on its own is conflicting.

Nootropics in pre-workout supplements?

If you’ve never heard of nootropics, you may be wondering what they are. Nootropics are the new fad type of supplement that aims to enhance cognitive function.

In the fast-paced world we live in today, people either sink or swim. This is why a lot of people are supplementing to gain that mental edge.

It all started with the Limitless movie featuring Bradley Cooper. After that movie’s release, everyone wanted to know whether that pill actually existed.

The reason nootropics are a great addition to a caffeine-free preworkout is the positive effect on the mind-muscle connection. Experienced bodybuilders know that form is critical.

It took me years and years to begin dialing in my form. Eventually, I realized that form is a lot more important than the amount of weight I lift when I’m isolating a muscle or muscle group.

Nootropics work to enhance focus, alertness, feelings of well-being, motivation, memory. They also help to reduce anxiety, depression, brain fog, sleepiness, and fatigue.

It’s easy to see why the effects of nootropics benefit people who are serious about fitness.

How to Choose the Best Caffeine-Free and Stimulant-Free Preworkout

Before you choose the best caffeine-free pre-workout in my Top 10, it’s best to consider your goals. Below are several key questions to ask yourself before you choose your stim-free pre-workout supp:

Are you looking for a bigger pump or more energy?

Are you looking for a more affordable supplement that’s not going to break the bank?

Do you want to avoid artificial sweeteners, dyes, and fillers?

Do you prefer a simple formula that stacks well with other supplements?

Have you had any allergic reactions or other negative reactions to ingredients in supplements before?

Do you prefer unflavored powders?

Do you prefer capsules instead of powder?

Once you answer all or several of these questions, you’ll have a better idea of which supplement suits you best. It’s also important to keep in mind that most bodybuilding pre-workout powders contain the same ingredients with different combinations and dosages.

You may also want to try 2-3 to decide which one works best for you. Whenever I try a new supplement, I spend what I call “experiment money.” Without experimenting and comparing several brands, it’s nearly impossible to find the one that treats you best.

Best Stim-Free Pre-Workout Supplements for Energy

  • Genius Pre
  • ALLMAX Impact Pump

The four supplements above provide the greatest energy boost of the formulas in my Top 10. The rest of the supplements’ main focus is to boost Nitric Oxide and blood flow for an intensified pump.

I have yet to see another pre-workout supplement on the market that’s as complete as Genius Pre. I’ve reviewed several Genius Brand supplements, and most of them impressed me.

Bottom Line

In essence, there are two types of caffeine-free pre-workouts: the type that enhances your pump and the all-around type that provides an energy boost along with an enhanced pump. It’s up to you to decide which type of supplement is your preferred choice.

I saw people make the mistake of buying an N.O. booster pre-workout and expecting it to give them a jolt of energy like caffeine.

By following my guide and choosing the right supplement in my Top 10 for your goals, you give yourself the best chance of choosing the best caffeine-free pre-workout supplement for you the first time.

Jump Back to My Top 10