Size Slim Pre Workout Review

By: Rob Miller
1 User Reviews
Fact Checked On: 5-29-2018

Editors Note: I received a free bottle of this supplement from Size Slim, however i was NOT paid for this review. Click Here to visit the official Size Slim website.

When you own a supplement review site as large as, you get A LOT of requests from companies to review their supplements. Most of the time I am just completely inundated with these requests, and in many cases I just turn down the offer because I’m too busy.

This wasn’t the case with Size Slim…one of the owners, a man named Roger Bowman, contacted me directly and asked if I would give their supplements a shot. Since I’m always on the lookout for the latest and greatest pre workout supplements and fat burners, I agreed to give it a try.

So how does this pre workout supplement stack up against the others, and more importantly, how well does it work? Read on to find out my experience.

What is Size Slim Pre Workout?

The Size Slim pre workout formula is made up of typical ingredients you’d find in a lot of other pre’s. For one there’s L-Arginine, which is an amino acid that helps to facilitate the process of vasodilation, or widening of the blood vessels. During this process, nutrients are theoretically delivered through the bloodstream more efficiently, and is directly responsible for that “vascular” / veiny look you get when you take a pre workout supplement containing it.

size slim pre workout reviewAs expected, Size Slim pre workout also contains a number of stimulants, including caffeine and synephrine HCL. The caffeine content is 180 mg per serving, which is about the equivalent to a cup and a half of good, strong coffee.

The focus / concentration inducing ingredients appear to be beta-alanine, CDP Choline, and Vinpocetine for it’s ability to help improve blood flow to the brain. The suggested use is 1 level scoop mixed in water, 30 min. prior to beginning your workout.

My Personal Results

Since taking pre-workout supplements is nothing new for me, I knew what kind of results to expect and as a result, whether or not to put Size Slim in the good, bad, or decent category. I’m happy to report that this one is DEFINITELY in the “Great” category.

The first thing I noticed about Size Slim pre workout was the taste…it was GREAT! Alot of pre workout powders leave you with that chalky / chemically aftertaste, but not this one. I felt like I was drinking a Lipton raspberry / lemonade drink, which by the way is the only flavor Size Slim makes to date as far as I know.

I could definitely feel the energy start to kick in about 20 – 30 min. after drinking it, and hopped in the gym for a quick leg workout. I was sort of in a rush, so this was “supposed” to be a 30 min. squat / deadlift session and that was ALL. After pressing out a few sets of squats, I could tell that I was able to squeeze out a couple more reps then normal.

The next thing I knew I had this ridiculous SURGE of energy coursing through my body. It hit me like a freight train, and what was supposed to be a 30 min. workout turned into almost an hour and a half workout. My legs were shaking so bad when I finished I had to sit in my car for about 10 min. before I could even attempt to drive.

One thing I want to note is that you should NOT take this late in the day. The third time I dosed with the Size Slim pre workout formula it was about 5:30 in the afternoon, and I had a REALLY hard time falling asleep that night.

I suggest if you workout later in the day, that you don’t take this within 6 hours of your typical bedtime, otherwise you might be staring at the ceiling for a few hours.

Where To Buy

You can purchase the Size Slim pre workout formula on their official website, A one month supply (30 servings) will run you about $59.99, however, they do offer a substantial discount of 25% if you enroll in there monthly subscription service.

This will ensure that you receive a fresh tub of their product when you need it. As of this review it’s not available in any stores like GNC, Vitamin Shoppe, Walgreens / CVS, but I’ll keep you posted if that changes.


  • Fast acting, could literally feel the effects kicking in within 20 min.
  • Gave me sustained, lasting energy and focus for my workouts
  • Tastes Great!
  • No awful come-down effects
  • No increase in anxiety, which is typical in alot of stimulant-based pre workout supplements
  • No sugar, creatine free


  • Not sold in stores
  • A bit on the expensive side at $59.99 per tub


All in all, I think the Size Slim pre workout formula is a winner. It packs a serious punch to get you primed and ready to have a kick ass workout, and doesn’t have that awful “come-down” feeling you get with alot of other preworkout supplements. With the added focus / concentration you get from the CDP Choline and Vinpocetine, it also seems to act as a very healthy nootropic as well.

Have You Used Size Slim Pre Workout? Leave Your Review Below!

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5 Star User Reviews

Have you used this supplement?


By Sierra roach,  Aug 18, 2015 content/files/2015/08/sierra size slim pre

First and foremost I'm not sure if other people get bad reactions from supplements but it's something I've struggled with the last year or so. Headaches, nausea, shakiness..  Just a lot of unwanted side effects. Until I found Size Slim that was the norm for me.  I've very picky about my recommendations to others and I would never recommend anything I didn't fully love.

This product is hands down the best pre workout I've ever tried.

I start by taking before a work out and I love that I don't instantly feel like I'm going to have a heart attack. My skin doesn't feel like it's crawling.  The way it makes me feel during my workout is just a really high energy and the most amazing pump! I could be mid workout or wrapping up and still have the same energy that I had before I started!  Sometimes I have to force myself out of the gym.

Besides the amazing energy it gives me, there's something a little more important to me. The reason I love this product the most is because of the zero side effects I've experienced.  I cannot remember the last time that I took a preworkout that didn't give me days worth the migraines... I haven't had one since I began Size Slim over a month and a half ago. Another huge side effect I'm happy to say I haven't experienced is the nausea other pre workouts gave me.

I care about my body a lot.  Not just the outside but the inside as well. Knowing Size Slim uses natural ingredients and is vegan is huge to me!  I happen to be lactose intolerant so I love that this is a product can be enjoyed by anyone suffering from the same allergies.

It gets really old trying to find products that my body can stomach. To finally find such an amazing product line has truly been a game changer for me!

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User Questions and Answers

Does size slim have creatine in n it -Virg

None of the Slim Size products has creatine.- Rob

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Author: Rob Miller

Supplement Critique

Rob Miller founded over 7 years ago, and has been the chief editor ever since. He has a diploma in Advanced Dietary Supplements Advisor, and worked at GNC for 3 years. He KNOWS supplements, both inside and out. Rob currently resides in Jupiter, FL, with his wife of 4 years.  Learn more about him in his Bio here. Follow him on Twitter , Facebook, LinkedIn, or find him on Google +.

4 comments on “Size Slim Pre Workout Review”

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  1. I have tried the Size Slim on your recommendation and I loved it.I just cannot find it
    again on their web site.
  2. I was looking into the extreme NO and instant knockout would you recommend buying just one or both because I want to lose a little body fat on the lower part of my abs but want to get muscular and jacked. If I were to use both should I also use the happy hippo phenibut. would really appreciate your help on this dilemma.

    1. Hey Cristano,
      Good questions. It’s definitely worth stacking supplements, but I would recommend you stack Instant Knockout ( with a pre workout supplement called Nitrocut ( instead. It’s a much more powerful combo and will get you faster results.

      Taking Phenibut ( with the two is a GREAT idea, but I would limit it to just 1 or 2 times per week to avoid building a tolerance.

      Hope this helps and let me know if you have any other questions.


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