High5 Energy Source X’treme

EnergySource X’treme is from British based company High5 Sports Nutrition. The description of this supplement states that it can help with concentration, attention and increased reaction time as well as maintaining endurance performance. This review will aim to understand how the ingredients within this supplement can achieve this.



Maltodextrin is a polysaccharide which is a complex carbohydrate. This ingredient is water soluble and unlike other carbohydrates, is easily digestible (1) and can give a quick release of energy without any spikes of glycaemia (2).


Fructose is a simple carbohydrate and is an intermediary in the metabolism of glucose (3). It has a low caloric value, low glycemic index (4) and gives a sweeter taste (5).


Sucrose is a simple carbohydrate and is an intermediary in the metabolism of glucose (3). It has a low caloric value, low glycemic index (4) and gives a sweeter taste (5).

Citric Acid

The main function of citric acid is the reduction of physical fatigue (6). The reason for this is due to citric acid being a major component of the tricarboxylic acid (TCA) cycle. TCA cycle is the process of converting carbohydrates, fats and proteins into carbon dioxide and water (7). By increasing citric acid it activates the TCA cycle and in turn speeds up ATP production thus replenishing energy.

Malic Acid

Malic Acid is an organic compound that is naturally created within the body. The benefits of this ingredient have been suggested to include a lowering in blood pressure, helping against pre – exhaustion which will prolong exercise and reduce fatigue. There is a lack of research for this ingredient and more is needed to fully understand the benefits of this ingredients.

Magnesium Gluconate

Magnesium has been found to be used for 300 biochemical reactions in the body (8). It has been found to maintain muscle function (9), support a healthy immune system (10), keep the heart beat steady (11), and help strengthen bones (12). It has also been found to maintain blood glucose levels (13) and aid in the production of energy and protein.

Tri Sodium Citrate

Sodium Citrate is the sodium salt of citric acid. The benefits of this ingredient that have been observed are mainly for short term high intensity exercise (14). During high intensity exercise performance is limited due to an increase of pH within the muscle and the bodies inability to counteract this from buffering systems (15). Sodium Citrate can help aid this by helping to neutralize and offset these hydrogen ions and decreasing the pH level, this means that the body can perform short term, high – intensity exercise for longer periods of time (16).

Potassium Citrate

Potassium citrate is a form of potassium which has several function such as regulating water balance (17), central nervous system function (18) and helps convert glucose into glycogen which provides energy to the bodies muscles (19).

Calcium Gluconate

Calcium is a vital part of dietary consumption in order to aid growth and maintenance of bones (20). Other important benefits of calcium include helping blood clotting (21), heart contractions (22), lungs (23) and muscles to function properly (24), this is due to calcium binding with phosphate to create calcium phosphate (25).


Sodium chloride is otherwise known as salt. It is theorised that sodium chloride can help prevent cramps as the key mechanism in muscle contraction is the flooding of the action potential in the muscle membrane, and so if there is a sodium deficiency it may cause the muscle to cramp (26).


For many years caffeine has been a widely used as an ergogenic aid. There have been many studies of caffeine’s effect of both the aerobic system, (27), and the anaerobic system, (28) on sporting performance. The suggested benefits of caffeine supplementation include the ability to attain greater use of fats as an energy source and sparing of muscle glycogen, (29).

It has also been suggested that there is an increase of calcium release from the sarcoplasmic reticulum, which can create a greater muscle force production, (30). It has also been theorised that the effects of caffeine are probably exerted through effects upon the central nervous system or skeletal muscle by greater motor unit recruitment and alterations in neurotransmitter function (31).


The ingredients within this supplement can achieve the claims that it makes which include increased reaction time, concentration and  attention with the help of caffeine. Prolonged endurance performance is also achievable with carbohydrates that are included. This product is recommended to be taken either pre or during exercise. This product has no banned substances when referring to the WADA prohibited list when observing the label / ingredients posted on the website.

*NOTE – This product has not been tested in a laboratory and may contain other substances that may not appear on the label


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30 – Tarnopolsky, M. A. (1994). Caffeine and endurance performance. Journal of Sports Medicine, 18(2), 109–125

31 – Bruce, C. R., Anderson, M. E. & Fraser, S. F. (2000). Enhancement of 2000-m rowing performance after caffeine ingestion. Journal of Medicine and Science in Sports and Exercise, 32 (11), 1958–1963.

Use for  Endurance
Website  highfive.co.uk
Price  £16.49 – 29.49