Best Sugar-Free Pre-Workout Powders of 2025

"I've tried several C4 pre-workout supplements, and this is my first time with this one. It's decent but feels better suited for beginners or women. On the first day, I didn't feel much and didn't experience the usual tingling sensation. The second day was slightly better, but I'm planning to try taking two servings next week. The taste isn't the best but dissolves easily. Overall, it's a good product."

"I honestly don't get why some people complain about the taste—I find it delicious and it works well! I tried the Fruit Punch flavor, and it reminds me of red Kool-Aid. I mixed it just with water for this review to see the true flavor, and I loved it. Coming from a terrible experience with N.O. Xplode, this has been a pleasant surprise. I was able to lift heavier weights and see some muscle development!"

"I really enjoy the canned C4 products for the energy boost and the beta-alanine tingle, so I decided to try this pre-workout as I'm preparing for a cycling road ride. The Arctic Snow Cone flavor is pleasant and not overwhelming. I add a scoop to my water bottle for longer workouts or chug a smaller amount for shorter HIIT sessions. For me, the energy I get is steady and clean, though I wish the beta-alanine tingle was stronger. Overall, it seems like a reliable everyday pre-workout."

"This is my first time trying Bloom. I also drink kiala greens, and I decided to try Bloom based on a friend's suggestion. I really like that it works for me pre-exercise, giving me the perfect amount of happy energy, maybe due to the caffeine. It tastes good, and I can feel the difference within an hour of drinking it. I didn't expect it to work so fast! So far, it's the right amount of boost, and it has improved my mood. I'm cautious about energy drinks but this one has been fine for my heart rate. I will continue to take it and update my review later."

"I used to dread cardio, but Bloom's pre-workout has changed that for me. I typically drink energy drinks like Bang, but I will no longer be using those. Not only does Bloom taste and smell amazing, but it also actually works! I found myself working out for two hours without even realizing it. I was able to do 45 minutes on the stair master instead of just 15, and I lifted extra sets. I didn't crash afterward, which is usually a problem for me with other pre-workout drinks. This stuff is awesome!"

"I started with two other Bloom products and loved them, so I decided to try the pre-workout. I’m so glad I did! It tastes great, mixes easily, and gives me a noticeable burst of energy without any jitters. I mix it with about 12 ounces of water and sip it on the way to the gym. It provides clean energy for my 45-minute workouts without a crash afterward."

"C4 Original Icy Blue Razz is my go-to pre-workout! I love its intense energy boost, enhanced endurance, and delicious flavor. I've noticed improved focus and faster recovery times. Plus, it’s clinically-dosed without any fillers. I rate it 5/5 for energy and taste!"

"I've been using the C4 powder for a few months and I’m thrilled with it! The Icy Blue Razz flavor is amazing and it mixes easily. I experience a smooth, sustained energy boost that helps my endurance. It’s definitely worth the investment!"

"I got this for my husband who plays volleyball, and he’s very happy with it! It gives him great energy and focus for training, and he loves the icy blue razz flavor. It’s sugar-free and has just the right amount of caffeine!"

"I've been using C4 pre-workout for years and it's the best fit for me. I appreciate that it gives me a solid boost without jitters. Buying online saves me money, and with Prime, I get it in just two days!"

"As someone who's been lifting for over 20 years, this pre-workout is top-notch. It reminds me of the old school formulas that really enhance my energy and focus. I often purchase it for my friends too!"

"I find this pre-workout to be very effective and a great value. The full serving was too much for me, causing some nausea, but after switching to half a scoop, I still get energy without the jitters. I've learned it's 300 mg of caffeine per serving, which is quite a bit!"

“I’ve ordered this 14 times because it works! It gives me a clean boost at the gym, allowing me to power through 20-30 minutes of weights and cardio with zero fatigue, 6 days a week. I might be a little addicted to it; my workouts are tough without it. The taste is OK, though a bit salty, which I assume is due to the electrolytes.”

“I was surprised by how much I enjoyed this drink. The flavor is delicious, and I felt a noticeable difference right away. I strongly recommend it since it has no side effects and dissolves quickly without any aftertaste.”

“I initially chose this pre-workout for its no artificial sugar content, which is hard to find. The taste, however, was quite off-putting; it reminded me of dried beets ground into powder. Despite the taste, the clean energy I experienced after half an hour was incredible and lasted for hours without jitters. It’s the best energy I've ever had while working out!”

"I absolutely love the Hawaiian Shaved Ice flavor. It tastes amazing and provides a fantastic boost in energy and focus. No jitters like other pre-workouts I've tried!"

"After warming up, I felt some pins and needles, which I later learned was common. The flavor is okay, not delightful, but I'm seeing good results from regular use—just be active when using it!"

"This is my son's favorite! He feels energized after taking it, and I'm thrilled I discovered it for him. Energy drinks aren’t my thing, but he enjoys this one!"

“After 20 years of training and trying 30-40 pre-workouts, I can confidently say that Alpha GX7 ranks in my top 3. Its energy and focus were evident from the first use, and even after a month, it still performs like on day one. The pump is great, and I feel energized without jitters. Plus, the watermelon flavor is enjoyable, making it a product I highly recommend for anyone serious about their training!”

“Having worked out since 1993, I recently started using pre-workout supplements to maintain my performance. After trying 5-6 products, Alpha Gx7 stands out as the perfect balance of energy without overwhelming intensity. It helps me transition into my 6 AM workouts seamlessly. For anyone looking for a competitive edge, I suggest giving it a shot; it’s a low-risk trial for potentially great results!”

“I was initially skeptical about Alpha GX7 after reading mixed reviews, but it has definitely improved my cardio and weight training. I only use half a scoop, and I’ve seen a 15% increase in my treadmill speed. I feel more focused and energetic throughout my workouts, and there’s no post-exercise fatigue. I’m excited to continue using it and might even try different flavors!”

"I put this product in my water bottle and drink it while exercising."

"I bought this because it was inexpensive. The old saying 'you get what you pay for' made me remember why I like GFuel watermelon pre-workout drink."

"I work out daily without fail. This pre-workout shake has become a ritual for me. I drink it 30 minutes before every workout and use that time for other tasks. The taste is on par with anything else I've tried, and I got it because of the rising prices of pre-workout powders. If the price goes up, I might look elsewhere."

"This product works and tastes pretty good. I've bought multiple tubs, and it remains effective every time."

"At first, I was a bit skeptical, but this product is totally legit! The Wild Berry flavor is amazing, and it doesn’t overload me on caffeine. I love that it has zero artificial sweeteners; those usually give me horrible migraines. I've been using it almost daily before workouts, and it really gets me energized without any crash afterwards!"

"I switched to this product because it uses stevia as a sweetener instead of sucrose, which makes it a healthier choice. I mix it with water, and it gives me a good energy boost for my workouts. The taste is pleasant, though I wish it were a bit stronger, but overall, I’m happy with my choice!"

"I had high hopes for this pre-workout, especially since I’ve tried other brands. Unfortunately, I only felt a little tingle without any extra energy during my morning runs. It’s disappointing because I expected more from it. The flavor is good, but I ended up feeling drained rather than energized."

"I think the new C4 Sport is great! The extra caffeine really works for me, and I enjoy the flavors as well!"

"For me, these products provide just the right amount of energy to power through my workouts. I love the taste of C4!"

"I’ve finally found my ideal pre-workout in Cellucor C4 Sport. The Hawaiian Punch flavor is perfect, and I feel energized and focused throughout my workouts!"