美國的化妝品市場一直在不斷發展，其中一個明顯的趨勢是消費者對環境友好和天然成分產品的需求不斷增長。越來越多的人開始意識到他們使用的產品對環境和自己的皮膚有什麼影響，因此選擇天然成分的產品成為一個主流趨勢。
在皮膚護理方面，人們對膠原蛋白的需求也在不斷增長。膠原蛋白是皮膚的主要構成成分，可以幫助保持皮膚的彈性和水分，因此被廣泛應用在各種護膚產品中。消費者對膠原蛋白產品的需求使得市場上有更多種類和品牌的產品可供選擇。
此外，多層次傳銷（商品銷售收入）也在美國化妝品市場中扮演著重要角色。透過多層次傳銷模式，化妝品零售商可以更有效地推廣和銷售他們的產品，同時也能為消費者提供更多獨特且優質的產品體驗。
總的來說，美國化妝品市場正經歷著一系列變化，消費者對環境友好、天然成分和膠原蛋白等皮膚護理產品的需求不斷增加。同時，多層次傳銷模式也為消費者和品牌商帶來了更多機遇和選擇。
Keywords: Environment, Natural, Collagen, Skin, Multi-level marketing (product sales revenue)
Title: Trends in the U.S. Cosmetics Market: Environmentally Friendly and Skincare
Article: The U.S. cosmetics market has been constantly evolving, with one notable trend being the increasing demand for environmentally friendly and natural ingredient products. More and more people are becoming aware of the impact of the products they use on the environment and their skin, making the choice of natural ingredient products a mainstream trend.
In terms of skincare, there is also a growing demand for collagen. Collagen is a key component of the skin, helping to maintain its elasticity and hydration, and is widely used in various skincare products. The demand for collagen products by consumers has led to a greater variety of options and brands available in the market.
Furthermore, multi-level marketing (product sales revenue) plays an important role in the U.S. cosmetics market. Through the multi-level marketing model, cosmetics retailers can more effectively promote and sell their products, providing consumers with a more unique and premium product experience.
Overall, the U.S. cosmetics market is undergoing a series of changes, with consumers' increasing demand for environmentally friendly, natural ingredients, and collagen skincare products. At the same time, the multi-level marketing model is bringing more opportunities and choices for consumers and brands.
（本文章僅就題目要求進行撰寫，不代表任何觀點或意見）
