Blood donation

Since the 1940s, Johnson & Johnson has supported blood drives that have helped save the lives of millions of Americans. Test your knowledge about who is and isn’t eligible to donate, rare side effects and how to find out what happens to donated blood after it’s drawn from your arm.

In honor of World Blood Donor Day, here’s a look at why the warm weather months are a crucial time to consider donating blood—and how just a few teaspoons can have a big impact on someone’s life.