WHAT IS WHEY PROTEIN ISOLATE (WPI)? Whey protein isolate is a byproduct of cheese manufacturing, and it is the liquid that is left over after the milk has been processed. WPI consists of approximately 90% protein, with almost zero carbohydrates and fats. WPI also has almost no lactose (99% lactose-free), this is why those who have sensitivities to lactose often choose WPI as their protein source. WPI has a full amino acid profile, making it one of the best protein sources on the planet. Because of our Whey Isolate's superior quality and rigorous lab testing, you can expect to receive a complete amino acid profile supporting you to fulfil your full human potential. Our Whey Isolate goes through an ultra-filtration process ensuring the protein is left in its most natural form, leaving a high protein percentage with minimal fats and carbohydrates. Due to its high protein percentage, low fat and low carbs, WPI is highly effective as a muscle recovery shake after intensive exercise.