Transparent Labs Stim-Free Pre-Workout Review – Is Anything Missing?

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Transparent Labs is making some pretty serious waves in the supplement industry, and not just because their products are all free from artificial ingredients. This is the kind of company that takes transparency pretty darn seriously: not only do they provide certificates of analysis and authenticity on their website, but they also back up all their claims with links to published studies.

They have a large amount of pre-workouts on offer as well. We’ve tried the one designed for muscle gain and the one designed for fat loss, but the Transparent Labs Stim-Free Pre-Workout is pretty interesting as well. Of course, there are no stimulants. So what does it bring to the table?

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Transparent Labs Stim-Free Pre-Workout
Transparent Labs Stim-Free Pre-Workout

An unusually powerful preworkout that's packed with clinically effective doses of ingredients linked to everything from power to endurance. Save 10% by using code BARBEND10.


Transparent Labs Stim-Free Pre-Workout Ingredients

One scoop is pretty large (about 25 grams) and contains the following:

Citrulline malate (6g)
Branched chain amino acids (4g)
Beta alanine (4g)
Creatine Hcl (3g)
Betaine (2.5g)
Taurine (1.3g)
N-acetyl l-tyrosine (600mg)
Choline bitartrate (500mg)
Velvet bean extract (70mg)
BioPerine (5mg)

Transparent Labs Stim Free Workout
Transparent Labs Stim Free Workout

Transparent Labs Stim-Free Pre-Workout Benefits & Effectiveness

So what do all these do? There’s seriously a lot going on here.

If you’re interested in power, the betaine and the creatine were both included on our science-backed list of supplements for boosting power. Tyrosine and taurine can both improve focus, with taurine also having some links to improved recovery because it can help draw more water into cells. Beta alanine is another pre-workout stalwart that may help with endurance, while choline bitartrate can improve anaerobic endurance or short, high-intensity bursts of energy. The branched chain amino acids (BCAAs) may help with muscle retention and focus during intense workouts, particularly if you’re exercising on an empty stomach.

There are also some less common ingredients here. Bioperine is black pepper extract, which some studies have found can improve absorption and the norvaline may help with muscle growth and vasodilation. Finally, the mucuna pruriens is also called velvet bean extract, which is meant to help with the production of hormones like adrenaline and testosterone. To be fair, most studies that have found that were on people whose hormone production was already impaired.

What about the doses? They’re actually pretty darn solid. Many pre-workouts contain ingredients that have a lot of research supporting them, but they don’t include enough of them to produce the desired effects. Transparent Labs really does a great job in this regard, with the possible exception of branched chain amino acids which are dosed at 4 grams, while many feel 7 grams is a better bet.

Transparent Labs Stim Free Pre Workout
Transparent Labs Stim Free Pre Workout

There are just a couple of potential downsides. Norvaline has a bit of a reputation for producing dizziness and beta alanine can cause a tingly sensation on the skin, which will be especially pronounced here because the product has over twice the 1.6-gram dose you normally find in a pre-workout. Because of this, it’s probably a smart idea to start out using smaller doses of the product.

Transparent Labs Pre Workout Scoop
Transparent Labs Pre Workout Scoop

Transparent Labs Stim-Free Pre-Workout Price

You can pick up a bag of 30 servings for $49, so it’s $1.63 per serving. If you get multiple bags the price drops a little bit: you save about $5 a bag if you get two, and about $10 a bag if you get three.

That’s a little pricy for a pre-workout; in my experience most are between 80 cents and $1 per serving, but since most pre-workouts aren’t as well-dosed you may find the price worth it.

Transparent Labs Stim-Free Pre-Workout Taste

It’s available in four flavors and I grabbed the Strawberry Lemonade flavor, which tasted a bit like sour bubblegum. I liked it a lot. Oftentimes, naturally flavored pre-workouts will focus on lemony flavors because it’s easier to produce natural sour flavors than sweet, but while it’s more sour than anything else, there’s definitely an undercurrent of strawberry that makes this a pretty enjoyable flavor.

The Takeaway

Transparent Labs have made a really remarkable product, here. Without using stimulants it uses the industry’s most popular and promising ingredients for power, endurance, intensity, focus, and recovery. The norvaline and beta alanine may make it a bit strong for some folks but if you don’t have issues with those ingredients, there’s not much to dislike here.

Transparent Labs Stim-Free Pre-Workout

Per Serving: $1.63










  • Wide variety of effects
  • Well dosed
  • No artificial ingredients


  • Norvaline can produce dizziness
  • A little pricy
  • Very high in beta alanine
Nick English

Nick English

Nick is a content producer and journalist with over seven years’ experience reporting on four continents. His first articles about health were on a cholera outbreak in rural Kenya while he was reporting for a French humanitarian organization. His next writing job was covering the nightlife scene in Shanghai. He’s written on a lot of things.

After Shanghai, he went on to produce a radio documentary about bodybuilding in Australia before finishing his Master’s degrees in Journalism and International Relations and heading to New York City. Here, he’s been writing on health full time for more than five years for outlets like BarBend, Men's Health, VICE, and Popular Science.

No fan of writing in the third person, Nick’s passion for health stems from an interest in self improvement: How do we reach our potential?

Questions like these took him through a lot of different areas of health and fitness like gymnastics, vegetarianism, kettlebell training, fasting, CrossFit, Paleo, and so on, until he realized (or decided) that strength training fit best with the ideas of continuous, measurable self improvement.

At BarBend his writing focuses a little more on nutrition and long-form content with a heaping dose of strength training. His underlying belief is in the middle path: you don’t have to count every calorie and complete every workout in order to benefit from a healthy lifestyle and a stronger body. Plus, big traps are cool.

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