Dr. G was featured in MSN lifestyle with the following:

"Collagen is made in the body with the help of vitamin C, the amino acids glycine and proline (amino acids that help to build protein) and the mineral copper. Copper activates an enzyme involved in collagen production, explains Dr. Gretchen W. Frieling, a dermatopathologist and CEO of GFaceMD in the Boston area."

Check out the full article here