From Dr. David Eifrig, MD, MBA in Retirement Millionaire Daily:

Your medicine cabinet may be hiding the biggest health danger in your home…

If you’ve been reading Retirement Millionaire Daily, you’re familiar with the risks of taking certain over-the-counter pain relievers and dietary supplements on their own.

But if you’re taking a prescription medication, you’re at even greater risk of a dangerous… even deadly… drug interaction.

A new study in the journal JAMA Internal Medicine found that 25% of seniors don’t report all of the medications they use (including supplements) to their doctors.

What these folks don’t realize is that supplements can have serious… potentially fatal… interactions with other drugs.

For example, popular supplement St. John’s wort makes many drugs less effective. When taken with cancer drug panobinostat, the cancer drug loses 70% of its effectiveness. This is so extreme that it can lead to treatment failure.

Calcium supplements are…