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Table 2 Caffeine and magnesium content of selected food and drinks

From: Does long-term coffee intake reduce type 2 diabetes mellitus risk?

Food or drink Caffeine mg Magnesium mg
Regular coffee, brewed from grounds* 95 7
Regular coffee, brewed from grounds, decaffeinated* 2 12
Coffee, brewed, espresso* 509 192
Regular instant coffee* 62 7
Decaffeinated instant coffee* 2 12
Carbonated beverage, cola† 29 0
Energy drink† 108.4 11.6
Tea, brewed* 47 7
Milk chocolate bar‡ 9 28
  1. Source: U.S. Department of Agriculture Agricultural Research service (2007).
  2. * cup of 237 mL or 8 fl oz
  3. † can of 355 mL or 12 fl oz
  4. ‡ bar of 44 g or 1.55 oz