Is your collagen medically-proven? HealthDirect collagen protein is a medical-grade. It is perfectly predigested into the smallest peptides for better absorption, by even the most sensitive gut. It is highly concentrated and ready-to-drink for your busy life. These "whole body" peptides build all 28 types of collagen in the body including types I, II, III, IV, V, and X. This makes us the #1 choice of health professionals for over 40 years.