Caffeine Effects: Withdrawal, Sleep & Health Impact

Caffeine impacts everything from sleep quality to concentration and heart rate. Learn how long withdrawal takes, the diuretic effects on the body, and the potential risks of taking caffeine tablets with medication or alcohol.

What Types of Tea Are Caffeine Free?

Published Jul,08 2011 | By Megan Smith

Whether you've decided to cut back on caffeine on your own, or your doctor recommended you reduce your caffeine intake, one strategy is to eliminate black and green tea, which both contain caffeine. Even black teas that are labeled "decaffeinated" contain trace amounts of caffeine.