By Collin Brennan

The Best Pre-Workout Supplements

The best pre-workout supplement has a mix of clinically proven ingredients: creatine and beta-alanine to super-charge anaerobic strength, plus caffeine and citrulline to improve endurance. It also skips junk ingredients like artificial colors and sweeteners. While no pill or powder is going to beat a healthy diet and good night’s sleep, the best pre-workout supplement will safely and conveniently give you that extra boost.

The 3 Best Pre-Workout Supplements

The Best Pre-Workout Supplements: Summed Up

Gnarly Nutrition Pump
Vega Sport Energizer
SAN Nutrition CM2 Supreme
Best for strength workouts
Best for endurance workouts
Bet caffeine-free supplement
60 mg
100 mg
0 mg
Price per serving
Calories per serving
Serving size
1 scoop in water
1 scoop in water
6 tablets

Gnarly Nutrition Pump Pre-Workout Supplement

Best for
Strength Workouts

Gnarly Nutrition Pump

A balanced formula for building muscle from a company that values transparency and education
Quality ingredients
Naturally sweetened
Low Caffeine

Why we chose it

Quality ingredients

Yes, we love the name, but there’s a whole lot more to love about a clean, all-natural supplement that focuses on the ingredients that work and kicks all the other garbage to the curb. Gnarly Pump contains no artificial colors, flavors, or sweeteners and no proprietary blends that make you guess the dose you’re taking.

More important, however, is what it does contain. Many of the experts we talked to recommend a supplement with nitric oxide boosters, which help to dilate blood vessels and increase blood flow to key muscles. Gnarly Pump contains two such boosters in arginine (5,000 mg) and citrulline (1,000 mg), plus 5,000 mg of creatine to help build lean muscle. In keeping with Gnarly’s focus on all-natural ingredients, the supplement also contains 60 mg of green tea extract, a natural source of caffeine that may help to boost energy levels without leading to a case of the jitters.


Gnarly’s entire philosophy revolves around transparency in its products and educating consumers about what they should put in their bodies — no false promise of instant six-packs. All of their products are free of GMOs, hormones, and artificial sweeteners, a commitment that we only saw matched by Vega. The company even runs a blog that’s frequently updated with helpful articles on how to avoid overtraining, what to eat before a marathon, and how to fill your diet with more veggies. We’ll be honest, we got pretty immune to the sports nutrition marketing hype throughout our search. But Gnarly managed to break through that fatigue with genuinely inspiring articles about living a life of wellness. We highly recommend checking it out.

Naturally flavored

Choose between two flavors of powder, Crankin’ Cranberry and Orange Mango, both of which are naturally sweetened with plant-derived stevia extract.

Gnarly for Pre-Workout Supplements

Points to consider

Low caffeine

One serving of Gnarly Pump gives you 60 mg of caffeine, which is less than you’d get with one cup of coffee, and is pretty low by the standards of most pre-workout supplements. A number of reviews online love that the product is all-natural, but said that it just didn’t give them much of an energy boost. So you may not get the jitters from this product, but you won’t see dramatic, “wow”-inducing results either — expect a more subtle, natural lift to your workout.


Taste is subjective, and what appeals to one person might cause another to cringe. That being said, we found numerous internet reviews that were not fond of the cranberry and orange/mango flavors. One reviewer noted that the Crankin’ Cranberry tasted “like cough medicine and melted jello mixed.” In our own testing, we didn’t find the flavor to be that obnoxious; and we’d suggest you try it out yourself to see if it tickles your taste buds or not.

Vega Sport Pre-Workout Energizer

Best for
Endurance Workouts

Vega Sport Sugar-Free Energizer

All-natural energy boosters and extra carbs in lieu of muscle builders, making it perfect for endurance training
Abundant carbs
Natural boosters
Ingredient safety
Doesn't dissolve well

Why we chose it

Abundant carbs

Vega Sport Sugar-Free Energizer doesn’t have muscle-builders like creatine and beta-alanine, because that’s not what it’s designed for. Instead, it has 16 grams of carbohydrates per serving — compared to four grams for Gnarly Pump and zero for S.A.N. — making it an excellent choice for workouts that require more sustained, if less taxing, effort — like yoga, Pilates, or long-distance running. Experts recommend extra carbohydrates for endurance workouts because carbs delay fatigue and optimize muscle function.

Natural boosters

If you tend to work out at a slower or more deliberate pace, this could very well be the supplement to give you that extra bit of energy and focus without making you feel too jittery for a calmer workout like yoga. Vega includes several ingredients that promote overall gut health like ginseng, turmeric, and ginger. It also delivers a good combination of natural boosters like green tea, which a Penn State study suggests may enhance the effects of exercise, and yerba mate, which has been shown to enhance fat metabolism during light and moderate exercise without negatively affecting performance. While they’re not proven to directly impact exercise performance, their benefits carry over well beyond the gym.

Ingredient safety

We were also extremely impressed with the overall quality of Vega’s ingredients. Labdoor, an independent company that tests health supplements for safety and efficacy, gave Vega a 75 out of 100 for ingredient safety (Labdoor has not yet scored Gnarly Pump). Aside from its stellar safety score, Vega is also one of the only supplements we saw that is certified both vegan and gluten-free.

Vega for Pre-Workout Supplements

Points to consider

Doesn’t dissolve well

You start your workout early with this supplement, because it takes work to get it to dissolve nicely in water. Online reviews mention having to use a blender or shaking vigorously to get all the chunky bits broken up, and it tends to leave a bit of residue in the bottom of your glass.


This is a very minor quibble, but it’s worth noting that, especially with the lemon-lime flavor, it will stain if you spill it on your clothes.

S.A.N. Nutrition CM2 Supreme Creatine Supplement

Caffeine-Free Supplement

SAN Nutrition CM2 Supreme

Delivers a comparable strength-boosting formula to Gnarly Pump without the extra energy
Everything but caffeine
Productive ingredients
Tablet form

Why we chose it

Everything but caffeine

Everyone responds to caffeine a little differently. If you know you’re sensitive to it or if you’re already exceeding the recommended amount in your normal diet, S.A.N. CM2 Supreme is totally caffeine-free. It still has all the lean muscle-building ingredients we loved in Gnarly Pump, just without the additional energy booster. Without any caffeine, you’ll also lose some of the sharpened focus that is a big appeal of other pre-workout supplements, but it had everything else we were looking for.

Productive ingredients

This supplement comes with arginine (2,000 mg), a nitric oxide booster that promotes blood flow to your muscles, and creatine (1,000 mg), one of the most proven lean muscle builders around. While the doses of these ingredients are less than what you get with Gnarly, this is both a pre- and post-workout supplement, so you’re really getting double those amounts. S.A.N. CM2 Supreme also has one productive ingredient that we missed in Gnarly Pump: beta-alanine, a nonessential amino acid that’s been shown to increase exercise capacity during short, high-intensity workouts.

CM2 for Pre-workout Supplements

Points to consider

Tablet form

The only thing we weren’t crazy about was the form: Instead of a mixable powder, CM2 Supreme comes in tablet form. S.A.N. recommends six tablets per serving, so you could end up swallowing as many as 12 pills per day if you take them before and after your workouts. We found the supplements that mixed into a drink to be much, well, easier to swallow, particularly if you’re taking your supplements on the go.

Guide to Pre-Workout Supplements

How to find the right pre-workout supplement for you

Assess your workout

As we’ve already indicated with our choices, the type of workout you’re planning has a lot to do with the supplement you choose. If you’ve got a sustained cross training session on your schedule, for example, you need to focus on endurance and your ability to sustain your energy levels for an hour or more. But if it’s leg day and you’re doing squats for a shorter but more intense workout, energy isn’t as important and your muscles may be crying out for a product that builds them up and helps them recover. If you do both types of workouts on alternate days, consider investing in more than one product to give you the right kind of lift for each workout.

Never experiment on race day

Supplements affect different people differently, so it’s never a good idea to test one out on the day of a race or competition. Give yourself a few weeks to ease yourself into a new supplement and gauge how your body reacts to it. When it comes to the big day, the fewer surprises, the better.

Consider your gender

While necessary ingredients won’t change, experts recommended that women keep a closer eye on dosage when looking for a pre-workout supplement. Spano says, “Women will need to carefully look at the amounts of each ingredient because of smaller body size. There are some ingredients that they may need in smaller amounts, particularly stimulants.” All of our top picks contain safe dosages, but if you’re still concerned, you might consider reducing the serving sizes.

There’s also some stigma around women taking muscle-building substances like creatine, but all the research has concluded that it’s just as beneficial for women as men. One study in the Journal of Strength and Conditioning Research reported, “Men and women experience similar improvements in exercise performance following creatine supplementation, but women show a lesser increase in lean body mass.”

Guide to concerning ingredients

Not everything in a pre-workout supplement is good for you. Here’s a brief list of the concerning ingredients (and their side effects) we found in the pre-workout supplements we researched. Our top picks minimize these ingredients, but we had a hard time avoiding them entirely.


Artificial Sweetener
  • Acesulfame Potassium (Sunett) — Methylene chloride (a known carcinogen) is a by-product of the acesulfame potassium (ACK) creation process. The FDA states it does not expect methylene chloride to remain in the finished product due to: “(1) The multi-step purification process used in the manufacture of ACK and (2) the volatility of methylene chloride,” but the connection remains.
  • Splenda (Sucralose) — Splenda is the trade name for sucralose. Research notes that sucralose is made by adding more chlorine atoms to a sugar molecule. Artificial sweeteners like sucralose appear to be correlated with an increase in irritable bowel diseases.

Sugar Alcohol
  • Erythritol — If consumed in high amounts, erythritol can cause cramps, nausea, flatulence, and diarrhea. While it is considered to be one of the safer sugar substitutes, people who overindulge on pre-workout supplements will exceed safe limits.
  • Glycerin (Glycerol)Side effects include diarrhea, nausea, vomiting, and headache.
  • InositolPossible side effects include diarrhea, dizziness, flushing, itching, loss of appetite, nausea, upset stomach, and vomiting if it is ingested in high quantities.
  • Polydextrose — Has the capacity to cause abdominal cramping, bloating, and excessive gas.
  • Xylitol — Gas, bloating, and diarrhea can occur with high dosages.

Pre-Workout Supplements FAQ

Do I really need a pre-workout supplement?

Spoiler alert: The best pre-workout supplement isn’t a supplement at all. Every sports nutritionist we talked to emphasized a “food-first approach,” with a focus on fruits, vegetables, and pre-workout meals rich in carbohydrates. Stella Metsovas, a former USA competitive swimmer and author of Wild Mediterranean, told us, “Supplements should never replace the nutrient quality found in whole foods,” adding that you should focus first on “a healthy balance of macronutrients (proteins, carbohydrates, and fat) around two to three hours before your training session.”

Still, supplements can make a difference when combined with good eating habits. Lindsay Langford, sports dietitian for SVSP, says, “I do feel that when you’re working with athletes especially, a lot of time there’s room for that extra one or two percent that we can get from a supplement.”

How much caffeine is too much?

If a daily cup of coffee or tea is already part of your routine, taking a pre-workout supplement like Legion Pulse (350 mg of anhydrous caffeine) or iSatori ISYMFS Pre-Workout Amplifier (a whopping 425 mg of caffeine in various forms) already puts you over that threshold. Add the occasional chocolate bar or energy drink, and we start to get into dangerous territory. Make sure to plan your diet, and try not to go over that daily 400 mg mark — if you suspect that your body might be able to tolerate a higher dosage, consult with your doctor first.

What if I go over that 400 mg dose?

You probably already know the answer to this if you ever pulled an all-nighter in college. Multiple cups of java or stimulant tablets will leave you feeling jittery and tense; really high levels can cause irregular heartbeat and seizures. It can take nearly 10 hours for that caffeine to move through your system, so overdosing for the sake of a workout will impact your ability to function for the rest of the day, and can keep you from getting a good night’s sleep if you exercise in the evening. If you do work out late in the day, we suggest you stick with a caffeine-free supplement.

Should I take a pre-workout supplement on days when I’m not training?

Probably not. These supplements are targeted to very specific goals, and there’s little benefit to them on your off days. In fact, not taking them on off days is good because it helps your body to remain sensitive to the ingredients in the supplement. It is possible to build up a tolerance to substances like caffeine if you take them every day, so that they are no longer as effective. Taking a break may help them to continue to impact your body at full potency over the long run.

How long before a workout should I take a pre-workout supplement?

The time it takes for a pre-workout supplement to take effect varies, and each product will disclose their best suggested times. However, most take between 20 and 45 minutes. Whichever product you pick, make sure to read the directions on the label to fully understand when to take your pre-workout supplement.

Should I eat something along with my pre-workout supplement?

You can eat before taking your pre-workout supplement, but know it may diminish the effects. Most manufacturers suggest taking them on an empty stomach so that you can experience the full effects. However, if you do choose to eat before you take your pre-workout, you should wait an hour to an hour-and-a-half for your food to digest before taking it.

More Supplement Reviews

Supplements can help you bring out the best in a variety of circumstances. Check out some of our other supplement reviews to get the full story in which ones offers the most benefit.

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