PRE Stim-Free is a pre-workout supplement by NutraBio. It comes in 20 serving containers, in 2 flavors – Green Apple and Watermelon.
Claimed to promote:
As you’ve probably guessed from its name, this supplement doesn’t contain Caffeine – but that’s not always a good thing.
Take a look:
About the Company
NutraBio is a supplements company founded in 1996.
They pride themselves on their manufacturing quality, with all their supplements being manufactured in cGMP certified facilities – which is something we give full marks for.
They market a range of products, from BCAAs to Protein Powders.
The Ingredients and How They Work
PRE Stim Free has a lot of ingredients inside – and more isn’t always better. It contains big servings of almost all of its ingredients, so let’s take a look at whether they’ve over-dosed any.
We’ll take you through the most important ingredients, to get straight to the point – showing you whether it’s effective or not.
See for yourself:
This is considered as the most important branched chain amino acid (BCAA) – it delivers the key benefits.
Its shown to boost muscle recovery and muscle protein synthesis, promoting muscle growth. But this isn’t a key benefit of a pre-workout supplement.
NutraBio should’ve replaced this ingredient with Beetroot Extract – this enhances muscle pumps during your workout.
Basically, this is an ineffective ingredient – studies have shown that it doesn’t offer any benefits.
But it gets worse. Betaine causes fishy odors in your breath and body secretions, which isn’t something you want.
A key pre workout ingredient, due to it’s ability to boost strength and endurance in the gym. It’s been used for decades, for one reason – it works.
NutraBio have dosed this well, but many people choose to supplement Creatine Monohydrate separately, so having a high dose isn’t extremely important (anything above 1,000mg will be effective in a pre-workout).
– Highest Rated Pre Workouts Here –
One of the best ingredients in PRE Stim Free. Why? Because it promotes intense muscle pumps during your gym session.
But how does it work? Well, Citrulline turns into L-Arginine in your kidneys. This raises your nitric oxide levels, leading to your blood vessels widening (vasodilation), resulting in increased blood flow.
So why not take L-Arginine instead? That would be a big mistake – L-Arginine has a very poor absorption rate, meaning your body doesn’t make use of it.
On the other hand, Citrulline Malate has a great absorption rate, and studies have proven it’s effective. NutraBio has optimally dosed this ingredient at 6,000mg, so you’ll be sure to experience great muscle pumps in the gym.
Inositol-Stabilized Arginine Silicate
This is basically L-Arginine bound to Silicate. But as we’ve mentioned in the Citrulline Malate section above, L-Arginine has a poor absorption rate, so this mixture isn’t likely to be effective.
There’s been no studies proven that it works – the only study we found was one conducted by the company producing this ingredient, so it’s very likely to be bias.
This is a herb extracted from the Huperziceae plant species. It enhances mental function and is known for being used to treat Alzheimer Disease.
However, there’s not been a lot of studies conducted on Huperzine A – so there’s no proof that it’s effective in a pre workout supplement.
But here’s the bad news – it’s known to cause side effects like nausea, diarrhea, sweating, blurred vision and cramping.
Check out which ingredients work and which don’t in our
– Pre workout ingredients guide –
NutraBio believe that they’ve avoided side effects by avoiding Caffeine – keeping this pre workout ‘stim free’.
However, ingredients like Betaine and Huperzine A actually come with greater risks of side effects than Caffeine.
Here’s the list of the potential side effects from using PRE Stim-Free:
- Fishy odors in breath and body secretions (Betaine)
- Nausea (Huperzine A)
- Diarrhea (Huperzine A)
- Blurred Vision (Huperzine A)
- Cramping (Huperzine A)
Not what you’re looking for? Check out our
– Top 3 Pre Workout Page –
Pro’s and Con’s
- Contains Citrulline Malate and Creatine Monohydrate
- Optimal amount of Citrulline Malate
- Can cause numerous side effects
- Contains ineffective ingredients (Betaine)
- Not good value for money ($34.99)
PRE Stim-Free Review Conclusion
NutraBio have marketed this product, mainly by making Caffeine look bad and keeping it ‘stim-free’. Why? Because many pre-workouts have a high Caffeine dose which causes side effects, putting people off Caffeine.
However, Caffeine is a key ingredient when dosed properly, between 150-200mg per serving – which isn’t anymore than a cup of coffee or 2 cups of green tea.
Also, NutraBio has been unable to avoid side effects – Betaine and Huperzine A cause unwanted side effects, and are less beneficial than Caffeine.
Basically, unless you can’t consume Caffeine due to allergy, then it’s a key ingredient in any pre workout supplement. The only real positives about PRE Stim-Free is that it contains Citrulline Malate and Creatine Monohydrate.