Whey Protein Isolate

About Whey Protein Isolate

Whey Protein Isolate (WPI) is a high-quality bioavailable protein source that is rapidly absorbed. Whey is one of the two proteins found in cow's milk, along with casein. Unflavoured whey protein isolate typically contains 90% protein by weight and low in fat and carbohydrates, at around 0.5-1% lactose. With seasonal variation, whey protein isolate can vary from 88% to 91% protein content. The amino acids naturally contained in whey protein isolate are quickly digested and rapidly absorbed.

Whey protein has a biological value of 104, the only protein higher than egg (rated at 100). In nutrition medicine, the protein quality of all foods and supplements are compared to egg as a gold standard. The high biological value of whey protein is a simply indicator of complete absorption by the digestive tract. Manufacturing of whey protein isolate can use various processes, including ion exchange, microfiltration and even hydrolysis for a hydrolyzed product.

Whey protein isolate typically contains around 22-24% branched chain amino acids (BCAAs), which are naturally occurring within the complex protein structure. WPI is a powerful stimulator of mTOR, due to its high leucine content, one of the major triggers for protein synthesis. However, a meaningful serving size will need to be consumed in order to achieve this, equivalent to roughly 20-25 grams of protein. Protein synthesis is an anabolic state that repairs and builds crucial parts of the human body, such as organs, collagen, bone and muscle.

Given the low level of milk-sugar in WPI protein, most lactose intolerant people are fine using this product regularly and even multiple times daily. A 30 gram serve of WPI typically contains 200mg (0.2g) of lactose, however this should be confirmed on the packaging if you are lactose sensitive. The sugar content found in the nutritional table of WPI products is typically all lactose, unless sugar containing ingredients have been added, which can be identified on the ingredients list. 

Whey protein isolate is perfect for recovery, repair and lean muscle gain, or to supplement a diet that is low in quality protein. WPI is an excellent source of essential amino acids (EAAs) and, conditionally and non-essential amino acids. Countless clinical trials have been conducted looking into the benefits of whey protein isolate for various health conditions as well as supporting sports and exercise performance and recovery. WPI may be taken post-workout, between meals or with low protein meals.