Marshalls, TJ Maxx, and similar discount stores often sell high-end beauty products at significantly lower prices. This is possible because these stores typically source their products from a variety of places, including overstock items from other retailers, discontinued products, and items with packaging changes. However, this business model may inadvertently lead to the sale of expired makeup.

The first reason is the lack of a standardized system for expiration dates in the cosmetics industry. Unlike food products, cosmetic products are not required by law to have an expiration date on their packaging. This can make it difficult for both the retailer and the consumer to determine the shelf-life of a product.

Secondly, the supply chain for these discount stores is often longer and more complex than that of a regular retailer. Products may pass through several hands before reaching the store, which can extend the time between when the product is manufactured and when it is sold. This prolonged timeframe can potentially lead to the sale of expired products.

Lastly, because these stores often deal with overstock or discontinued items, there's a chance that the products have been sitting in a warehouse for an extended period before they even reach the store. This can further increase the risk of the products being past their prime.

While expired makeup may not always be harmful, it can lose its effectiveness. For example, SPF in makeup can degrade over time, reducing the level of protection it offers. Similarly, active ingredients in skincare products can become less potent. In some cases, expired products can cause skin irritation or infections.

Therefore, it's always important to check any beauty product you buy, regardless of where you purchase it. Look for signs of aging, such as changes in color, texture, or smell. If you're unsure, it's best to err on the side of caution and avoid using the product.