At the cutting edge of new trends, the cosmetics industry has a new batch of star products every few years. Take, for instance, retinoid acid, fruit acids, botox, L-ascorbic acid (vitamin C) and collagen-each has experienced its own sales frenzy.
走在潮流尖端的化妝業，流行素材每幾年就有不同的明星產品出現，如維他命 A 酸、果酸、肉毒桿菌、左旋 C、膠原蛋白等，帶動一波波的銷售高峰。