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PreSeries Bulk Pre-Workout Review

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About the Product

PreSeries Bulk is a pre workout supplement marketed by Transparent Labs. It comes in 30 serving containers at $49, so it’s one of the more expensive supplements we’ve seen.

This product is available in two flavors – Blue Raspberry and Green Apple.

Claimed to promote:

  • Muscle gains
  • Testosterone levels

Strangely for a pre workout supplement, there was no mention of boosts in energy levels, strength, or endurance – which are the key benefits of taking these kind of products.

Instead, Transparent Labs have focused on their Testosterone support complex and promoting PreSeries Bulk as a ‘Bulking’ aid.

About the Company

Transparent Labs is a supplements company that markets a range of products – from pre workout supplements, to mass gainer protein powders.

This company is proud of the fact that they don’t add any proprietary blends into their products – something we are fully behind. Transparent Labs only sell their supplements on their website, choosing not to use retailers or other websites.

They claim to only include “science-based ingredients at clinically effective dosages” – so let’s take a look whether PreSeries Bulk lives up to their standards.

The Ingredients and How They Work

One thing we like about PreSeries Bulk is that it doesn’t contain any properietary blends – so you know exactly what you’re getting.

Another positive is that this product contains an optimal amount of Citrulline Malate, which is a key ingredient in any ore workout supplement.

See for yourself:

Testosterone Complex

It’s strange that Transparent Lab has added this into PreSeries Bulk – a boost in T-levels isn’t a key feature of a pre workout supplement.

There are already top quality T-Booster supplements on the market, so if you want to increase your testosterone, you should check out the link: Our Top Rated Testosterone Boosters

Let’s take a look at whether the ingredients are effective:

Vitamin D3

This is a key ingredient in a testosterone booster supplement, but it’s not really needed in a pre workout. It’s proven to raise T-levels, but here’s the problem.

Vitamin D3’s only shown to deliver its benefits when taken in doses of 3332IU’s daily. The amount in PreSeries Bulk is just under, and you only take this supplement once a day, so your body won’t be topped-up with optimal levels of Vitamin D3 to make a huge difference.


Zinc is another great T-Boosting ingredient, but the TUL (tolerable upper limit) is 40mg. The 30mg dose of Zinc in PreSeries is very close to that limit, so those sensitive to it, or consuming foods high in Zinc may experience side effects – such as nausea, vomiting, and diarrhea.

Citrulline Malate

A key pre workout ingredient, Citrulline Malate’s proven to deliver intense muscle pumps in the gym. How?

Well, it turns into L-Arginine in your kidneys, which raises your nitric oxide levels. From there, your blood vessels dilate (vasodilation), and your blood flow increases – resulting in enhanced muscle pumps while you lift weights.

But why not take L-Arginine directly? Because L-Arginine has a poor absorption rate, meaning your body doesn’t make use of it when orally supplemented.

Transparent Labs has done well by including an optimal dose of Citrulline Malate, at 6,000mg. We recommend looking for dose between 6,000mg-8,000mg when looking for a quality pre workout supplement, to get the best results.


Transparent Labs has made a mistake here – while Beta-Alanine’s shown to enhance muscular endurance, it can cause paresthesia in doses over 0.8g-1g.

Paresthesia is a tingling on the skin of your face, chest, hands, and extremities – it’s not life threatening, but it’ll ruin your gym session.

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Made up of three Branched Chain Amino Acids, Leucine, Isoleucine, and Valine.

Supplementing with BCAAs can lead to improved muscle protein synthesis, but here’s the problem – it’s cheap to buy and take separately, so it’s not needed in a pre workout.

It’s beneficial, but not a key pre workout ingredient. Something like Creatine Monohydrate is more suited to a pre workout.


This is one of the worst ingredients in PreSeries Bulk. No studies have shown it to provide any benefits, but it’s known to cause a side effect – fishy odors in your breath and body secretions.

It’s not worth suffering this side effect for an ineffective ingredient,


This is an organic acid containing sulfur, and is most commonly used to reduce cramping. However, it’s not vital in a pre workout – it’s often wrongly believed to boost energy, as it’s found in energy drinks, but it has no effect on energy levels.

There are no negatives to supplementing with Taurine, but it could’ve been replaced by a more beneficial ingredient – such as Beetroot Extract, which promotes muscle pumps by raising nitric oxide levels.


Transparent Labs has obviously done their research, as L-Theanine is a great ingredient to add into a pre-workout. Here’s why – L-Theanine enhances the benefits of Caffeine without increasing the risks of side effects like jitters or energy crashes.


One of the most beneficial and safe ingredients to have in a pre workout, Caffeine improves strength, endurance, and cognition (alertness, focus, reaction time).

Transparent Labs has done well here – the best dose of Caffeine per serving is 150-200mg, so you experience the benefits without risking side effects like jitters or energy crashes. Even those sensitive to Caffeine won’t experience any negatives with a dose between 150mg-200mg.


Also known as Bitter Orange Peel, it’s known to cause harmful side effects and has been banned in the UK. However, companies add Synephrine into their supplements as it’s shown to boost fat loss, which is its main benefit.

But here’s the problem – fat loss isn’t an important benefit of a pre workout supplement.

There are already top quality fat burners on the market, so there’s no need for a pre workout supplement to contain fat burning ingredients – especially one as potentially harmful as Synephrine.

Check out which ingredients work and which don’t in our
Pre workout ingredients guide –  

Side Effects

There are a few ingredients in PreSeries Bulk that can cause side effects – Beta-Alanine, Betaine, and Synephrine.

Here’s the list of potential side effects from using PreSeries Bulk:

  • Paresthesia – tingling on the skin of your face, chest, hands, and extremities (Beta-Alanine)
  • Fishy odors in breath and body secretions (Betaine)
  • Nausea (Synephrine)
  • Sweating (Synephrine)
  • Dizziness (Synephrine)
  • Headache (Synephrine)

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Pro’s and Con’s


  • Contains ‘smart-caffeine’ combo.
  • Optimal dose of Citrulline Malate.


  • Contains Synephrine – banned in the UK for causing harmful side effects.
  • Missing key pre workout ingredients, such as Creatine Monohydrate.
  • Some ineffective ingredients, like Betaine.
  • Expensive.
  • Not good value for money.
  • Can’t buy from retailers.
  • Contains fat burning and T-boosting ingredients, and isn’t a specialized pre workout supplement.

PreSeries Bulk Review Conclusion

There’s a weird mix of great ingredients, along with ineffective ingredients that can cause side effects in PreSeries Bulk.

Transparent Labs has clearly done their research, as they’ve added the ‘smart-caffeine’ combo of L-Theanine and Caffeine, to deliver enhanced benefits of Caffeine without increasing risks of side effects like jitters and energy crashes.

However, they’ve also added Synephrine, which is banned in the UK for causing harmful side effects. Betaine is another questionable choice, as it’s not shown to provide any benefits in any study – but it causes fishy odors in you breath and body secretions, which isn’t pleasant.

Transparent Labs nearly got it right, but they’ve fallen short with PreSeries Bulk. We recommend that you look for a pre workout that’s free from side effects, and includes more key ingredients like Creatine Monohydrate and Beetroot Extract.