Ingredient Check: What's A Growth Factor? What's EGF?

Every once in awhile, a particular ingredient (edible or otherwise) gets a ton of press and starts appearing in everything from drinks to lotions. Why? Is it all hype, or are there any real benefits? If there are benefits, what's the best way for you to incorporate this new ingredient into your already-crowded life? We sort through the hype and do the r…