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A number of studies have found that athletes consuming commercial carbohydrate sports fluids to replace losses during games and endurance sports often experience stomach upset or gut disturbance. 

The greater incidence of gastrointestinal discomfort with fructose ingestion is thought to be related to the absorptive mechanisms of fructose in the small intestine. Unlike glucose which is actively transported across the the intestinal epithelium, fructose is absorbed via facilitated diffusion. Consequently, fructose is absorbed from the proximal small intestine at a rate slower than that of glucose resulting in comparatively slower rates of fluid absorption. This is considered the cause of the gastrointestinal distress and diarrhea often reported with fructose feeding.1

 1 Litchfield, R. 2012. Iowa State University publication: Eat to Compete: what you should know about fluids.

The products are manufactured in Australia and New Zealand.

All of the products in the IsoWhey Sports range are free from any artificial colours, flavours or sweeteners. They are naturally sweetened with stevia, xylitol or thaumatin. 

Stevia is a sweetener derived from the leaves of the plant Stevia rebaudiana. Steviol glycoside extracts have up to 300 times the sweetness of sugar. Stevia has a negligible effect on blood glucose making it an ideal option for individuals trying to minimise carbohydrate intake.

Xylitol is on par with sucrose for sweetness, but with 33% fewer calories. Xylitol is naturally found in low concentrations in the fibres of many fruits and vegetables.

Thaumatin is an extract from the katemfe fruit (Thaumatococcus danielli) which is harvested from west African rainforests. It is a protein, not a carbohydrate, therefore does not impact the blood sugar or have a laxative effective. Thaumatin is 3650 times sweeter than sugar.


Damage is caused to the body when you train. Small micro-tears occur in muscles, nutrients are used up, and the heat shock from your higher body temperature can damage your intestines. The damage to the intestines means that digestion and nutrient uptake is compromised and you become susceptible to nausea and diarrhea, plus you are likely to get more infections.

Our gut is home to numerous bacteria, typically in a balance of both good and bad bacteria. A healthy digestive system has a balance of both good and bad bacteria. Causes for the balance to be disturbed include: eating a poor diet high in refined carbohydrates, insufficient dietary fibre and exposure to environmental toxins.

Probiotics are micro-organisms (mostly bacteria) that are essential and beneficial to digestive balance. They help support digestive function and the immune system. 

The Pre-Workout Fuel contains 100mg of caffeine per serve, while 100% Lean WPI+ Chocolate contains 42.5mg caffeine per serve. 

The Australian Institute of Sport (AIS) has classified caffeine as a Group A Supplement, which means that it is supported for use in specific situations in sport. In comparison, a typical short black/espresso would contain approximately 107mg of caffeine.1

1  Table  1:  Caffeine  content  of  common  foods,  drinks  and  therapeutic  products  (Australia)  adapted  from  Burke  et  al.  2012  from  a  variety  of  sources.

Typically, when whey protein isolate (WPI) is analysed for its nutrient composition, we find that it will contain 90% protein, 5% total mineral content and 5% moisture. Therefore, what we have in 100% Lean WPI+ is 24.9g of WPI, providing 90% (22g) of protein.

Each 30g dose contains approximately 21.5g of carbohydrate, 13.5g of which is glucose.