Is it weird to take prenatal vitamins when not trying to get pregnant?

M
My doctor said I have a slight iron deficiency and recommended taking a supplement. She said that prenatal vitamins were a good option. I never thought to take prenatal vitamins before because I always thought they were for women who either were or were trying to get pregnant. I'm 20 years old and a junior in college and 150% single so I'm definitely not trying to get pregnant right now, 

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