As the “green” products trend continues to advance, consumer demand for natural personal care products is driving a major shift from niche distribution channels to more mainstream mass retail outlets. This is fueling a sharp increase in sales, according to a study by worldwide consulting and research firm Kline & Company. “For a long time, natural products have been the domain of health and organic food stores—niche retailers with a core group of loyal customers,” says Karen Doskow, proj...