It's National Coffee Day.

It's National Coffee Day.

Americans are jostling to get their free cup of coffee in celebration of National Coffee Day on September 29. This is a good time for the Americans to get the coffee that they like - it's because it's for free!

Now, CoffeeHouse Inspirations™, America's premier at-home creamers, is extending that sweet coffeehouse experience to the year's other 364 days with luxury you can afford.

According to the Mayo Clinic, the amount of caffeine in different brands of coffee differs dramatically. For example, a 16-ounce Dunkin Donuts brewed coffee can have anywhere from two to four times as much caffeine as a Starbucks espresso

          Here's a short list of caffeine content:

* Dunkin' Donuts, brewed, 16 oz (480 mL) 143-206
* Generic brewed, 8 oz (240 mL) 95-200
* Generic brewed, decaffeinated, 8 oz (240 mL) 2-12
* Generic instant, 8 oz (240 mL) 27-173
* Generic instant, decaffeinated, 8 oz (240 mL) 2-12
* Starbucks Espresso, 1 oz (30 mL) 58-75
* Starbucks Vanilla Latte, 16 oz (480 mL) 150

For those with anxiety, insomnia and a bad belly, caffeine isn't going to help. In fact, the Mayo Clinic warns that heavy caffeine consumption - more than six cups a day - can cause all kinds of ugly symptoms such as irregular heartbeat, muscle tremors, headaches, and of course inability to sleep and irritability.