People with elevated blood pressure or abnormal heart rhythms are advised to consult their doctor before taking caffeine.

How much caffeine are you getting?*
On the average:
• 8-ounce cup of average coffee = 100 milligrams
• Black Tea (8 ounce cup) = 40 milligrams
• Green Tea (8 ounce cup) = 20 milligrams
• Red Bull (8 ounce can) = 80 milligrams

Starbucks:
• Tall (12oz) = 95 milligrams
• Grande (16oz) = 260 milligrams
• Venti (20oz) = 325 milligrams
• 1 single oz shot of espresso = 65 milligrams

*Source: MSNBC

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