Do Prenatal Vitamins Cause Weight Gain?

Although prenatal vitamins can cause constipation, bloating, and other minor side effects for some women, there is no proof they can cause weight gain. Because they contain zero calories, your weight gain is most likely just from the pregnancy itself.

What happens if you take prenatal vitamins if you are not pregnant?

You may be tempted to take prenatal vitamins because of unproven claims that they promote thicker hair and stronger nails. However, if you're not pregnant and not planning to become pregnant, high levels of certain nutrients over a long period of time may actually be more harmful than helpful.

What are the side effects of prenatal vitamins?

Iron, calcium, iodine, and other minerals in prenatal vitamins can sometimes cause side effects including:
  • hives.
  • stomach bleeding.
  • teeth staining.
  • muscle weakness.
Elena Rostova

Elena Rostova

Lead Health, Wellness & Medical Journalist

Elena Rostova holds a Master's degree in Public Health Journalism. She covers groundbreaking medical research, holistic wellness trends, mental health awareness, and nutritional science.