Probably not, I can have 500ml Cans of Energy Drink with 32mg per 100ml and they wont keep me up all night, but can deffinatly hinder the time it takes to fall asleep. That said, it wont make you feel more energised or awake, or doesn't for me.
I usually have at least 200mg a day but it doesnt stop me sleeping. I usually take that in the morning though so it has usually wore off by mid afternoon.
50mg is about a half a cup of coffee... if you know a cup of coffee wont keep you up then defiantly not. If your looking for a straight source of caffeine, then caffeine pills are your answer. Your normal caffeine pills have 100mg of caffeine (1 cup of coffee) and extra strength have 200mg (2 cups).
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