According to the Law of People's Republic of China (PRC) on the Protection of Consumers' Rights and Interests, consumers can return goods for no reason within seven days after purchasing them. However, food and beverage products are special commodities, and their effects and applicability vary from person to person, so they are usually not included in the scope of unreasonable return.

In this case, it is necessary to understand the return policy and relevant laws and regulations of slimming products. If the return policy of slimming products clearly stipulates that it can be returned, and the time for customers to request a return is within the scope allowed by the return policy, then it should be returned. If the return policy does not clearly stipulate whether it can be returned, or if the time required by the customer has exceeded the time limit stipulated in the return policy, then the merchant can refuse to return the goods.

In addition, if the reason why customers want to return goods is the product quality problem or the fraudulent behavior of the merchants in the sales process, then the merchants must accept the return goods and bear the corresponding responsibilities.

In short, the return policy is an agreement between merchants and consumers, and the return requirements should be handled according to the policy and relevant laws and regulations. Any dispute can be settled through negotiation, mediation and arbitration.