Who would you write a letter against animal testing to?

I would write a letter against animal testing to regulatory agencies, such as the Food and Drug Administration (FDA) or the European Medicines Agency (EMA), which oversee and approve testing methods for pharmaceuticals and products. Additionally, I could address it to companies that conduct animal testing, urging them to consider alternative methods. Raising awareness among influential figures in the scientific community and policymakers could also amplify the message against animal testing.