have not heard of Dr McCormick - but always wonder about those who recommend products that they also sell - and seems like he doesn't know enough about the collagen used in the products he sells. The chemical constituents of collagen are broken down in the digestive process. This suggests 2 things to me - that you could just as easily obtain those chemicals through the food you eat (assuming a healthy, nutritional diet here) and you need to make sure that you are fully digesting - and therefore getting the nutritional benefits of - the food you do eat.