Final answer:
Biological products like vaccines and protein-based drugs must be gently agitated, not shaken, to prevent denaturation and maintain efficacy.
Step-by-step explanation:
Some biological products, such as vaccines, monoclonal antibodies, and certain protein-based drugs, should be slowly agitated instead of shaken. Shaking these products can lead to denaturation or aggregation of the proteins, causing them to lose efficacy and potentially increase the risk of adverse reactions. Instead, gentle agitation is used to mix the product while preserving its structural integrity and effectiveness.