Nutritional information may vary depending on flavour. This blend is made with highly purified collagen peptides to give you a delicious shake with a 90% protein content*, helping you to boost your daily intake without taking on unnecessary fats and carbs. What is collagen? Collagen is a protein that's mainly found in skin, hair, nails, and other connective tissues in the body, making it the most abundant protein in humans and mammals. It's slightly different to whey and casein protein because it has a high level of the amino acids, glycine, proline, hydroxyproline and arginine.