There are several risks associated with purchasing a second-hand mattress, which we’ll detail in a moment. In general, we would not recommend buying a used mattress because it isn't safe for your home or your sleep health.
From unhygienic surfaces to introducing infestations to your home, it's best to avoid used mattresses. A second-hand mattress won't come with a warranty, either. Purchasing directly from a manufacturer will eliminate these risks and be a better investment of your money.