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They shouldn't. There's nothing in a vitamin tablet that should affect wakefulness.
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∙ 13y agoThis answer is:
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Wiki User
∙ 15y agob vitamins are for energy initially... its kind of like how sugar or an energy drink works. they give you energy and then you crash, or making you feel sleepy
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Wiki User
∙ 14y agoYes, they can make you drowsy.
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∙ 13y agoyes
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Earn +20 ptsQ: Why does b vitamins make you sleepy?
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