Many IM readers are familiar with phosphatidylserine, a soy lipid (see page 64). It’s big on helping reduce cortisol, the stress hormone routinely linked to obesity, cancer, heart disease, depression and muscle loss. A few years ago researchers found that it can reduce cortisol by more than 30 percent in hard-training athletes who want to avoid muscle breakdown and build more muscle size and strength. Now a new study from Korea shows that it can fight wrinkles caused by sun damage and natural aging. It appears to stimulate the production of new collagen in the skin.