Can collagen drinks really make a difference to your skin? Dr Haran Sivapalan takes a look at the research behind these expensive little shots. In Greek mythology, Eos, the goddess of dawn, asked Zeus to give her lover Tithonus the gift of immortality. Somewhat forgetfully, she neglected to request that her lover also receive the gift of eternal youth. Over time, Tithonus continued to live, but his muscles became weaker, his skin grew wrinkled and less supple; it began to sag. Despite immortality, Tithonus’ body and its largest organ, the skin, continued to undergo the process of aging. Skin aging…