HR Labs Defib Pre Workout - 460g
HR Labs Defib Pre Workout - 460g
HR Labs Defib Pre Workout - 460g

HR Labs Defib Pre Workout - 460g

Regular price €39.99
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Defib redefines the pre-workout category. A bold statement for sure but one that we feel is entirely justified. We’ve taken a multi-faceted, synergistic approach to the pre-workout conundrum and cracked the code!

In a category littered with thoughtless, dated formulations, cheap under dosed and ineffective products take up way too much shelf space.

…But thankfully, we ain’t all in it for the money! A few brands do it right and do it well and we like to consider ourselves to be one of them. Defib was designed by people that train, for people that train. We only formulate products that we are excited to use ourselves!

Defib's research driven formula utilises high doses of effective ingredients, is fully transparent and highly effective. Made for Progress!


Citrulline Malate, Beta Alanine, Betaine Anhydrous (Trimethylglycine), Flavouring, Glycerol Monostearate, Taurine, Peak O2™ Adaptogenic Mushroom Complex (Cordyceps, Reishi, King Trumpet, Shiitake, Lion’s Mane and Turkey Tail), Phosphatidylserine, Acetyl-L- Carnitine, Anti Caking Agent (Silicon Dioxide), Acidity Regulator(Citric Acid), Citicoline (Cytidine 5’-Diphosphocholine), Caffeine Anhydrous, Sweetener (Sucralose), Dynamine™ (Methylliberine), L-Theanine, EnXtra® (Alpinia Galanga), Red Beet Extract, BioPerine® (Black Pepper Extract), Vitamin B12 (Cyanocobalamin), Vitamin B6 (Pyridoxine Hydrochloride).


Defib is a highly dosed, research driven pre-workout formulated for advanced trainers. Please consider your own tolerance levels prior to use. We recommend taking one scoop (11.5g) mixed with 250 – 350ml of water 20 – 30 minutes prior to training. Advanced users may benefit from taking two scoops (23g) in the same way. Optimal dosages of active ingredients attained at two scoops. Do not exceed more than 2 servings in any 24hr period, seriously. Do not use within 5hrs of intended sleep.

Allergen Advice: Manufactured in a facility that also handles Cereals including Gluten, Egg, Soya and Milk. Suitable for Vegetarians, Halal Certified.

Warning: Food supplements should not be used as a substitute for a varied, balanced diet. Not recommended for use by anyone under 18 years of age. Consult your doctor prior to use if you are taking any medication or suffer from any pre-existing medical conditions. *High caffeine content (200mg per serving). Not suitable for children or pregnant or breastfeeding women. Do not consume Caffeine from other sources whilst using this product – we’ve included enough!


Ingredients in more detail

Citrulline Malate

A bond of the amino acid citrulline and malate, citrulline malate achieves something in which many other ingredients have failed to do, increase the body’s arginine levels. This makes citrulline malate supplementation superior to supplemental arginine, which is why it is now considered to be infinitely superior. By increasing arginine which converts to Nitric Oxide (NO), citrulline malate expands your veins, greatly increase blood flow and allowing for great delivery of oxygen around your body. Citrulline malate has also shown to increase force production which may increase strength, and the ability to buffer lactate, increasing performance and time to exhaustion


Carnosine is synthesized from Beta Alanine and buffers H+ ions. High intensity exercise elevates the amount of positive hydrogen ions (H+), putting your muscles in an acidic state which increases lactic acid build up, decreases strength and causes fatigue. By buffering H+ ions, carnosine normalises the pH balance, improving muscular performance. Beta alanine is also implicated in being neuroprotective, a quality great in any stimulant based product / pre workout.

Betaine Anhydrous

Betaine, also called trimethylglycine (TMG), reinforces muscle contraction by protecting skeletal muscle ATP, allowing it to generate the force required for the contraction of muscle, leading to better form and growth. Betaine is also an osmolyte, a molecule that regulates the body’s water balance, promoting cell hydration. As an osmolyte, betaine protects cells, proteins, and enzymes from environmental stress. The increase in cell hydration also causes muscular volumization, providing a great training pump.’

Glycerol Monostearate

A compound which main mode of action is hyperhydration. Increasing the concentration of fluid in blood and tissues. An excellent ingredient for hydration which improves exercise efficiency, decreases physiological stress and improves exercise endurance time.


An amino acid known for its ability to facilitate the production of the neurotransmitter GABA and the subsequent calming effects associated with this, helping to offset the negative side of stimulant consumption such as caffeine, subsiding any crash you often attributed to pre-workouts.

Peak O2™

An Adaptogenic Mushroom complex, rich in antioxidants. In clinical trials it was proven to increase the body’s ability to uptake oxygen and use it more efficiently. It was also proven to have a significant impact on power output. In short Peak O2 enables you to train harder, for longer!


A powerful amino acid derived nootropic compound that is found in high amounts in the brain, where it contributes to cognitive functioning, improving mental alertness and focus and enhancing mood.


Acetyl-L-Carnitine provides energy by facilitating the mitochondria’s ability to turn fuel sources such as Triglycerides (fatty acids) and Glucose (carbohydrates) in usable energy, therefore increasing their efficiency and thus rate at which fuel can be converted into energy for greater sports performance.


Caffeine works by blocking adenosine receptors in the brain. Adenosine is a central nervous system neuromodulator that has specific receptors. When adenosine binds to its receptors, neural activity slows down, and you feel sleepy. As caffeine reduces the ability of adenosine to bind to the receptors, the natural “braking” action of adenosine is inhibited, and neural activity therefore speeds up. The stimulated nerve cells then release the hormone epinephrine (adrenaline), which increases blood flow to muscles, improving the transportation of oxygen throughout the body, enhancing performance. Caffeine also increases levels of the neurotransmitter dopamine, enhancing cognitive functioning capabilities and neuromuscular coordination.


A choline source that has shown to significantly increase noradrenaline and dopamine levels in the central nervous system, providing a smooth stimulatory effect. CDP-Choline also elevates acetylcholine levels leading to a neuroprotective effect and improved focus and cognition. This cognitive enhancement is further magnified when combined with caffeine, significantly improving sustained attention, cognitive effort, and reaction.


Also known as methylliberine, a purine alkaloid found in the kucha tea leaf. Structurally it is very similar to its more famous cousin, theacrine (aka TeaCrine®). But is believed to take effect far quicker. Like theacrine, it enhances mood and focus by activating dopamine receptors and other key neurotransmitters all without elevating heart rate or blood pressure. Ongoing studies suggest that Dynamine™ may work synergistically to enhance the beneficial effects of Caffeine.


L-Theanine is an amino acid which is known to block the binding of L-glutamic acid to glutamate receptors in the brain. It is included for its ability to help prevent some of the adverse effects of caffeine such as potential headaches and anxiety. It has a synergetic affect when used with caffeine, improving cognitive function and increases concentration and perception of alertness.


Extracted from rhizomes of Alpinia galanga, EnXtra® is the only natural caffeine-free patent-pending ingredient that has shown in clinical research to improve alertness and focus for up to 5 hours without the addition of a stimulant and without raising blood or heart rate.


A bioavailability enhancer that works by inhibiting Cytochrome P450 enzymes, which are located in the liver and small intestines and usually would break down and destroy quite a few supplements. By inhibiting Cytochrome P450 enzymes you significantly increase the bioavailability of DEFIB’s ingredients for greater impact.

Vitamin B12

A water-soluble vitamin that is involved in the energy metabolism of every single cell of the human body. Vitamin B12 also possesses potent neuroprotective effects and has been shown to regulate human growth hormone.

Vitamin B6

A vital vitamin for physical activity as it improves energy levels by activating the release of glycogen from the liver and muscle. Vitamin B6 is also essential in cognitive and mental health, facilitating the enzymatic reactions that accelerate the synthesis of dopamine and serotonin, helping your overall mood.


Free next-day delivery in Ireland over €60, and from just €1.99 below €60.

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