Do Prenatal Vitamins Make You Gain Weight?

Do prenatal vitamins make you gain weight? Just because it’s loaded with folate, zinc, calcium, and vitamins A to E, that does not mean it’ll make you gain weight. Vitamins do not add to your pounds because it does not have calories. Almost all news articles and doctors will tell you that prenatal vitamins cannot be stored as fat or be broken down to energy.

All pregnant women will eventually gain 20 to 40 pounds during the course of motherhood. So, with or without prenatal vitamins, you will be putting on some extra pounds. You’ll be eating a lot and do some light exercises that may not get those serious fat burns you want.


Roles Of Prenatal Vitamins In Your Pregnancy

Never do prenatal vitamins make you gain weight. It boosts your immune system, gets your body and organs to function properly, and adds up lacking minerals you take from food. You need to take them because, really, it’s hard to get the nutrients to sustain you and your baby. Here are some of the benefits of taking prenatal vitamins:


There’s never more an important time than to take in as much as iron as you needed. Almost half of the women around the world lack the desired amount of it during their pregnancy. A healthy blood flow will get the nutrients straight to your baby. Iron also helps the oxygen passes smoothly in the bloodstream to your unborn child.

Folic Acid

This vitamin prevents congenital disabilities in your child like anencephaly, congenital heart disease, or cleft palate. It prevents preeclampsia – when the mother has kidney problems or suffering from high blood pressure – which results to a premature or miscarried birth.


Zinc is required to boost the immune system of the mother’s body. Babies need zinc for their growth and development, as well as the function of their DNA. Lack of zinc will cause low birth weight and other issues in delivery.


It’s needed for your and your baby’s own bone development. If the baby lacks calcium, the child will take it from the mother’s own. That’s why both should have adequate calcium intake to be strong and healthy. Also, calcium helps in baby’s growing heart, nerves, muscles, and tissues.


Boosts baby’s brain development and regulates the child’s metabolism rate. Little iodine in the mother’s system will result to miscarriage or stillbirth. Thyroid issues will also likely be reduced if the specified amount of iodine is taken by the mother.

Vitamins A to E

  • Vitamin A improves eyesight and skin generation. It also boosts protein synthesis and cell differentiation
  • Vitamin B1 or thiamine converts carbs to energy while developing your baby’s nervous system, heart, and muscles
  • Vitamin B2 or Riboflavin has the same role like thiamine when it produces energy. Moreover, like Vitamin A, it, too, promotes healthy vision and skin development. Riboflavin aids in the growth of bones, muscles, and nerves
  • Vitamin B3 lessens headaches and nausea. It would definitely help mothers-to-be rid of morning sickness!
  • Vitamin B12 supports the spine and central nervous system of a child. It also battles defects that may develop after birth.

Those are the roles of the vitamins found in the supplements. They boost growth and development but never do prenatal vitamins make you gain weight. The reason why you are gaining weight is because of food and lifestyle.

The Confusion In Gain Weight


Many women say that they gain weight while taking prenatal vitamins. But that statement cannot be backed up by science because all pregnant women do gain weight! This is where most confusion goes, however:

Various women react to these vitamins differently. For example, many say it causes more water retention which results to bloating. Moreover, high dosage of Vitamin A or iron can lead to problems of the kidney like fatty liver. If the liver cannot regulate the fats, it will lead to weight gain.

Another claim is that prenatal vitamins can make you crave more food. Now, if you give in to those cravings, you will surely grow bigger.

While some people experience all of these, another half of the population has not. Therefore, no one can really proclaim whether or not do prenatal vitamins make you gain weight. It has no calories and energy to store and burn. It merely is a supplementary to some people like the ones below.​

Why Women Take Prenatal Vitamins


Not all vitamins can be found in your daily intake of food. Or the fact that it’s hard to collect the nutrients you need for our body and baby. That’s why many resorted to taking prenatal vitamins. Women who have dietary issues and limitation are dependent on supplements to meet the needs of their pregnancy. Such women can be of the following but not limited to:

  • Women having twins, triplets, or more
  • Has history of surgery
  • Eating disorders
  • Multiple allergies
  • Food limitations like gluten-free
  • Vegetarians or vegan women

Because of their low sustenance in diet, these types of women can’t fully enjoy the benefits of vitamins found in food.

Side Effects Of Taking Prenatal Vitamins

Do prenatal vitamins make you gain weight? No! It has other side effects but does not add more pounds to that scale. Some of these are common sense while others take you to another level of pooping!

Too much prenatal vitamins: An overdose of prenatal vitamins can cause stomach issues, vertigo, nausea, vomiting, rapid mood changes, and sleeplessness. If you want to avoid that, try talking with your doctor first about taking one.

Green poop while pregnant: Prenatal vitamins can change the color of your poop to green because the bile and bacteria can’t process the stool that long to turn it to brown. Sometimes, the color of your vitamins can also affect the color of your poop.​

In addition to these, if one compound of your body has too much, it would be unwise to take vitamins that will make it worse. You have to read the label of your prenatal vitamins to ensure maximum dosage in your boy system.

When To Take The Vitamins?​

Actually, it would be best to drink the supplements at least three months before getting pregnant. To those couples who are planning to have a baby in the future, ladies should at least be taking prenatal vitamins to help her maintain a healthy, functioning body, ready to tackle the journey to motherhood.

Sudden Weight Gain And Body Control


An abrupt change of weight during pregnancy is still alarming. It could lead to heartburn, high blood pressure, and eventually preeclampsia that can cause premature or miscarried birth in babies. Low birth weight might also happen to children, and the possibility of congenital defects might occur too.

Therefore, pregnant women should better check themselves before opening another jar of cookies! In order to cut down some unnecessary weight, women should turn to eating healthy foods and observe proper diet. The mother should not overeat, but, only eat accordingly to her situation or the doctor’s advice.

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Correlation Between Weight And Prenatal Vitamins

No study can prove the fact that prenatal vitamins can directly change your weight. Whether or not you believe on that hearsay, never do prenatal vitamins make you gain weight. It has always been the control of eating and having an active lifestyle being pregnant.

Do you still believe that prenatal vitamins can make you gain weight? Why not share your thoughts about it?

Sarah Clark

Hi, I'm Sarah Clark. I like to write about mommies and their babies. Sometimes, even if I don’t, I like to hear stories from other mothers. I may not be an expert mommy by any means, but I am happy to share what works for mothers out there. I, for once, would like to build a community for mothers. And that's here in Giant Mommy.