Like any vaccine though, the flu shot can come with potential side effects—which are usually good signs that your immune system is creating the antibodies you need to fight influenza viruses ...

As with other drugs, Vyvanse (lisdexamfetamine) can cause side effects, such as headache or sleep problems. If you are unable to tolerate side effects of Vyvanse, talk with your doctor or pharmacist.

But what happens when levels climb too high? Whether through supplements or injections, excessive B12 can lead to surprising—and sometimes serious—side effects. Understanding these potential risks can ...