Index:

Caffeine: How much is too much?

2017/03/08

• Mayo clinic Introduction

Mayo Clinic is widely regarded as one of the United States' greatest hospitals and ranked No. 1 in the country on the 2016–2017 U.S. News & World Report List of "Best Hospitals" of the United States, maintaining a position near the top for more than 25 years.

• 400mg as the daily limitation for adult

Up to 400 milligrams (mg) of caffeine a day appears to be safe for most healthy adults.That's roughly the amount of caffeine in four cups of brewed coffee, 10 cans of cola or two "energy shot" drinks. Keep in mind that the actual caffeine content in beverages varies widely, especially among energy drinks.

• Adolescents should consider less caffeine!

Although caffeine use may be safe for adults, it's not a good idea for children. Adolescents should limit caffeine consumption. Avoid mixing caffeine with other substances, such as alcohol.

• You will have such reaction after take more than 400mg caffeine:

• Migraine headache

• Insomnia
• Nervousness
• Irritability
• Restlessness
• Frequent urination or inability to control urination
• Stomach upset
• Fast heartbeat
• Muscle tremors