PreSeries STIM-FREE Pre-Workout Review


  • Optimal dosage of Citrulline Malate (6,000mg)
  • Great dosage of Creatine (3,000mg)
  • No Artificial Sweeteners 
  • Taurine reduces cramping
  • BCAAs promote muscle protein synthesis (muscle growth)


  • Doesn’t contain Caffeine – good for those who want a stim-free pre-workout, but bad for those who love Caffeine.


  • Betaine is ineffective (but isn’t harmful either).
  • Beta-Alanine can cause paresthesia (tingling on hands, but isn’t harmful).
  • Can only buy from Transparent Labs’ website – it’s not sold in retailers (we were told this was to keep the selling price of products down and the quality high).

Learn More About Stim-Free Pre-Workout, Visit:

Transparent Labs Stim Free Pre Workout Review - LeanBulking

About This Product 

You can guess what this product is from it’s name – Stim-Free Pre-Workout. It’s made by Transparent Labs, a supplement company based in the USA.

This pre-workout comes in 2 flavors – Raspberry and Green Apple. We tried the Green Apple flavor, and it was surprisingly tasty, so this is a nice bonus feature.

How Much Does It Cost? 

The cost of Stim-Free Pre-Workout depends on what you order:

  • 1 Pouch is $49.
  • 2 Pouches are $89.
  • 3 Pouches are £119.

As you can see, the more you decide to buy, the less each individual pouch will cost.

Who Are Transparent Labs? 

Transparent Labs are a supplements company with a great reputation for products without any artificial sweeteners, food dyes, or harmful additives.

One thing we like about this company, is that they ship worldwide, and to military addresses – you’ll be surprised at how many supplement companies refuse to ship to APO, FPO or DPO addresses.

You can see more about their shipping policies on their website here, but we’ve never had any problem with Transparent Labs before.

Why You’ll Like It

One big positive for those who don’t like Caffeine or other stimulants in pre-workouts, is that this product by Transparent Labs is  stimulant-free. This completely takes away the risk of suffering from jitters, energy crashes or anxiety.

But we’re not hating on Caffeine at all – infact, when dosed correctly, it’s a key pre-workout ingredient. The problem is that many supplement companies add large doses of the stimulant in their pre-workouts, which can cause the side effects mentioned above – the good news is that you don’t have to worry about these side effects with Stim-Free Pre-Workout.

Not only that, Stim-Free Pre-Workout contains an optimal dosage of Citrulline Malate (6,000mg) – which means you’ll be sure to experience skin-splitting muscle pumps while you bi-cep curl and squat. This ingredient is one of our favorites, so we’re happy Transparent Labs did their research here.

Here’s what Stim-Free Pre-Workout claims to promote: 

  • Muscle Pumps
  • No Jitters or Energy Crashes
  • Strength Boosts 
  • Endurance

In this review, we’ve taken a look at this pre-workout’s:

  • Ingredients
  • Dosages
  • Side Effects
  • Our Personal Experience With Stim-Free Pre-Workout

For More Info About Stim-Free Pre-Workout
Visit Their Website:

What Convinced Us To Try Stim-Free Pre-Workout

We tried many different pre-workouts to review on this website, and were pretty disappointed by most of them. The main issue with the majority of pre-workouts, is that they generally contain too much Caffeine, which caused us jitters and energy crashes (a large dosage is over 200mg per serving).

For this reason, we wanted to try a stimulant-free pre-workout, which didn’t contain any Caffeine – to see how effective a pre-workout would be without it.

And we’re glad that we came across Transparent Labs’ Pre-Workout, after reading numerous positive reviews about it online.

Here’s why we chose Stim-Free Pre-Workout: 

  • No Stimulants – This means zero risk of suffering from jitters or side effects.
  • Great Ingredient list – This pre-workout contains great ingredients in optimal dosages.
  • Good Value For Money – With 6,000mg of Citrulline Malate, 4,000mg of BCAAs, and 3,000mg of Creatine, we knew we were getting our moneys worth here.
  • Carefully Tracked Delivery – We hate things getting lost in the post, but we felt safe knowing we could track our order.

Buying From Transparent Labs’ Website – Good or Bad?

From making our order, to Stim-Free Pre-Workout arriving – we didn’t have any problems. 

As a first time buyer from Transparent Labs, we’d were quite worried whether our order would arrive on time (or at all). We’ve had some bad experienced with supplement companies, where our order was lost in the post – we won’t name anyone, but just know that it happens.

Fortunately, Transparent Labs didn’t let us down – our order came on time, so we didn’t have anything to complain about.

We haven’t had to deal with their customer service team yet (which is a good thing), but we’ve heard good things about them online.

Here’s why buying from Transparent Labs’ website is safe: 

  • No reoccurring charges – We didn’t have any problems and were billed just the once.
  • Tracked Order Delivery – Your order won’t get lost, as you can track it throughout its journey to your home.
  • Great Customer Service – We’ve read great things about their customer service, in the unlikely event you have to contact them.

If you have any doubt, then we’ve heard great things about their customer service – ask them any questions on their website here.

To Buy, Visit:

Stim-Free Pre-Workout’s Ingredients Explained

The most important feature of any pre-workout is it’s ingredients. Ultimately, this section will inform you just how effective this product really is – if it has good ingredients, then it’ll be a good product – it’s as simple as that.

You’ll be glad to hear that this Stim-Free Pre-Workout most has great ingrededients that’re proven to work. In fact, Citrulline Malate & Creatine are two of our favorite pre-workout ingredients, and they’re dosed optimally – which is rare to find, in a market filled with terrible products.

Using our expert knowledge, we’ve analyzed each ingredient for you – so you can see how effective Transparent Lab’s pre-workout is.

Transparent Labs Stim Free Pre Workout Ingredient List Review - LeanBulking

Here’s Everything You Need To Know:

Citrulline Malate 

This is one of the best ingredients you can find in a pre-workout supplement. Citrulline Malate’s been proven to enhance your muscle pumps in the gym, in dosages between 6,000mg-8,000mg.

Transparent Labs has done well to add an optimal 6,000mg here, so your muscles will be pumped up while you curl those weights.

How does it work?

Well, Citrulline turns into nitric oxide in your kidneys – which increases your blood flow and therefore allows more blood into your muscles, effectively pumping it up.


We’ll be honest here – BCAAs aren’t essential in a pre-workout supplement.

However, it’s shown to promote muscle protein synthesis (muscle growth) and there’s no negatives to having this in Stim-Free Pre-Workout. For this reason, we’re giving it a thumbs up – especially as Transparent Labs have still included key pre-workout ingredients, such as Citrulline Malate & Creatine in this product.

Creatine HCI 

Creatine Hydrochloride is a form of Creatine – you’ve most probably heard of Creatine Monohydrate before, as it’s been around since the 1990’s.

Again, we have to be honest here: we prefer Creatine Monohydrate, but we’re part of the older generation stuck in our ways, and we’re used to supplementing with it.

Simply put, Creatine Hydrochloride is Monohydrate’s cooler, newer version – it’s believed to be more water soluble (so it’ll mix better in less water), and just as effective.

We didn’t find any differences between Creatine Monohydrate and Hydrochloride, which is a good thing because Monohydrate is one of the best ingredients available.

For this reason, this gets the thumbs up from us.


This ingredient is believed to enhance endurance, fat mass, and fatigue – while it hasn’t shown to deliver these benefits, it does lower your cholesterol levels.

But let’s be honest, it’s not the best pre-workout ingredient in Transparent Lab’s product. Fortunately, Stim-Free Pre-Workout’s other ingredients make up for this.


This is an organic acid that contains sulfur. It’s able to reduce cramping by increasing blood flow – meaning it’s likely to promote muscle pumps too.


A great ingredient for improving your cognition in the gym. When this is added into a pre-workout containing Caffeine, we’d say it’s not necessary as Caffeine enhances your focus – but as Stim-Free Pre-Workout doesn’t contain Caffeine, L-Tyrosine plays an important role in replacing it’s benefit.

How does increased focus improve your workout?

Basically, more focus allows you to form stronger mind-muscle-connection – meaning you make the most of every rep by concentrating on them more. Ultimately, you’ll make more progress in the gym.

To Learn More About Stim-Free Pre-Workout’s Ingredients: 
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Choline Bitartrate

We’re going to honest with you here. This is the worst ingredient in Transparent Labs. It offers no benefit at all – but the good news is that it’s not harmful in any way.

Stim-Free Pre-Workout contains optimal amounts of important ingredients that are proven to improve your workout; so this isn’t really an issue.

Mucuna Pruriens

Also known as ‘Velvet Bean’ due to the its furry texture – although you won’t notice this texture as it’s in powder form in Stim-Free Pre-Workout.

It’s an extremely beneficial ingredient in any supplement; Mucuna Pruriens improves numerous things, from your general health, to your testosterone levels. For this reason, it’s usually seen in T-Booster supplements, but as it can also reduce stress levels, it’s useful in a pre-workout too.


This is an interesting ingredient. It’s very useful in a pre-workout, and works in synergy with Citrulline Malate, or any other nitric oxide promoting nutrient.

How does it work?

Simply put, your body usually has a limit to the amount of nitric oxide it can produce. However, L-Norvaline allows your body to push past this barrier, and produce even more nitric oxide – which enhances your muscle pumps.

Ultimately, L-Norvaline ensures that you experience skin-splitting muscle pumps in the gym – helping you look look and feel good, but more importantly, train harder for longer.


This is simply black pepper that’s been given a fancy name – yes, the same black pepper that you put on your food and cook with.

It goes well with food, but not many know about its benefit in supplements. Basically, black pepper increases the absorption rate of other ingredients that it’s consumed with.

This means that the key ingredients that are inside Stim-Free Pre-Workout (such as Citrulline Malate & Creatine) become even more effective.

Black Pepper is a very underrated ingredient, but its proven to be very beneficial in numerous scienfitic studies.

Learn More About Stim-Free Pre-Workout on
Transparent Lab’s Website:

What Others Are Saying About This Product

As we mentioned at the start of this review – we were impressed by the countless positive reviews about Stim-Free Pre-Workout online.

Many people were happy with its performance, and these personal reviews are what convinced us to try Transparent Lab’s product. For this reason, we’ve included a few of the reviews left by customers below.

Take a look:

Transparent Labs Stim-Free Pre Workout Testimonials

Our Personal Experience

We always try every product that we review – at least for one serving. Obviously, if a supplement causes any side effects, we’ll throw it away and inform you in a review.

With Stim-Free Pre-Workout, we experienced no side effects – which is definitely a sign of a great pre-workout. We believe that this is because this product doesn’t contain any Caffeine – although we never experience jitters or side effects after consuming Caffeine doses under 200mg per serving anyway.

Personally, we do enjoy Caffeine in a pre-workout – but it’s hard to find a supplement that has a correct dosage, without causing side effects. So we also like that Transparent Labs has played it safe and made Stim-Free Pre-Workout great for those sensitive to Caffeine.

Stim-Free Pre-Workout review - LeanBulking

To Buy, Visit:

Side Effects

Transparent Labs are a company that prides itself on their products – they aim to avoid artificial sweeteners, food dyes, and harmful ingredients.

For this reason, Stim-Free Pre-Workout doesn’t contain any ingredients that can cause any harmful side effects. In fact, one reason why you might be interested in this pre-workout, is because it doesn’t contain any stimulants like Caffeine.

Ultimately, without any Caffeine, you have completely no chance of suffering from side effects like jitters or energy crashes – but on the other hand, you might not experience any intense energy boosts either.

If you don’t enjoy consuming Caffeine, or are very sensitive to it, then Stim-Free Pre-Workout is a great option for you.

Review Conclusion

We had mixed feelings when ordering this supplement – but we had to try it due to the countless positive reviews that we found online.

After trying Stim-Free Pre-Workout for ourselves, we have to agree with other customers and say how impressed we were by it. We usually choose pre-workouts that contain Caffeine (because when Caffeine is dosed correctly – between 150-200mg per serving – it offers numerous benefits), but we were glad that we chose Transparent Lab’s product to review.

This is definitely the best Stimulant-Free pre-workout that we’ve tried so far (we’re writing this in 2017), and we believe it’s the best option for those wanting to stay away from Caffeine – to avoid potentially suffering from jitters or energy crashes.


To Buy, Visit:
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