1. poor sales: the product sales are not high, which will lead to the product being removed from the shelf. This is due to fierce product competition, changes in consumer demand and inaccurate product positioning.

2. Quality problems: the product has quality problems, such as food safety problems or product quality problems, which will lead to the product being removed from the shelf.

3. Legal problems: There are legal problems with the product, and if it violates relevant laws and regulations, it will also lead to the product being removed from the shelf.

The above is only part of the reason. You can ask the merchants why their fruit and vegetable compound tablets are more brightly colored.