If you are selling (or even handing out for free) a physical product, you could be held liable if that product caused illness or injury to anyone.
You will need to purchase product liability insurance to protect you from this cost.
The typical guidelines of Products Liability insurance are that you need it if you are:
1) Manufacturing a product
2) Designing a product to be manufactured
3) Selling or handing out the product in person or online
While it is less common for customers to chase the retailer in the event of a claim, you can still be liable.
This is particularly important if you are selling products that are manufactured abroad, and therefore tracing the business responsible for them is impossible, whether because it’s not documented or simply because there is no contractual obligation to give any financial compensation.
Overall, as a retailer, purchasing Products Liability insurance is advisable.