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A deficiency can lead to symptoms like fatigue, breathlessness, numbness or tingling in the hands and feet, memory problems, and mood changes

Metabolism support

Vitamin B12 shots are especially helpful for certain groups of people, including: Vegetarians and vegans : Since B12 is mostly found in animal products, those who avoid meat may have lower levels

I feel more focused and motivated every day. Jessica L

Contraceptives This might seem counterintuitive (arent birth control pills supposed to regulate your cycle?), but hormonal contraceptives such as continuous dose estrogen/progesterone pills, the Depo-Provera shot, the birth control implant, and certain intrauterine devices (IUDs) can cause your period to not occur on time, according to Ella Speichinger, MD, an OB-GYN at University of Missouri Health Care