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Best Iron Supplements for Pregnancy of 2021

Updated
Learn about the role of iron in the body and get a list of iron supplements to try.

Have you done the test, seen the doctor, and confirmed you’re pregnant? Congratulations!

However, your blood tests show your iron levels are below what they should be. You may now be wondering which is the best iron supplement for pregnancy.

When I was pregnant, I was tired beyond belief. I could sleep all night and still nap most of the day. Then I found out my iron levels were low and it was not typical fatigue in pregnancy.

The question then was “Where on earth do I find a supplement?” There are so many on the market, it gets a bit confusing after a while. Let’s take a look at why you need iron supplements and then we’ll tell you our top five picks.

Our Top Picks

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Image
Model
Product Comparison Table
Features

Product Image of the MegaFood Blood Builder - Iron Supplement for Energy Support with Vitamin B12 and...
Best Overall
Mega Food
  • With beetroot which helps lower blood pressure
  • Proven effect in a clinical study
  • Certified kosher & GMO-free
Product Image of the Liquid Mineral Supplement, Iron, Nordic Blueberries, Full of Beneficial...
Best Liquid
Blue Iron Liquid
  • Contains folic acid
  • Plant-based iron
  • Blueberry flavored
Product Image of the Garden of Life Vitamin Code Raw Iron Supplement, 22mg Once Daily Iron, Vitamins...
Best Capsule
Garden of Life
  • From organic natural plants & fruits
  • Can be added to juice or water
  • No binders or fillers
Product Image of the FLORA - Floravital Iron & Herbs, Gluten Free, Vegan, Liquid, by Salus, 17 Fl Oz
Best Vegan Tablets
Floravital
  • Tastes like fruit
  • Non-constipating
  • Yeast and gluten free
Product Image of the NaturesPlus Chewable Iron - 27 mg, 90 Chewable Tablets - High Potency Supplement...
Best Chewable Tablets
Natures Plus
  • Tastes great
  • Gentle on stomach
  • Natural ingredients

The Importance of Iron During Pregnancy

Iron is a mineral that our bodies need to stay healthy. The red blood cells contain most of the iron in our body, in a pigment called hemoglobin. Hemoglobin is responsible for carrying oxygen around our body to the cells, organs, and tissues where it’s needed.

When iron levels are low, so are the levels of hemoglobin. This is bad news as it reduces the oxygen supply. Anemia is the name given to low hemoglobin levels.

The normal levels during the first and last trimester of pregnancy are considered to be above 11 grams per deciliter. This changes during the second trimester, when they can be a bit lower, at 10.5 grams per deciliter.

You might feel a bit like a pin cushion during pregnancy, having samples taken all the time. It is necessary, though, to make sure all is well. One of the things checked during blood tests is your iron levels.

Doctors will also check how much iron your body has stored. Yes, it can retain a certain amount of iron for when it’s needed. If you have depleted your stores and your hemoglobin levels are low, you’ll need iron supplements (1).

In addition to supplying nutrients for two, you are also supplying blood to two when you’re pregnant, so your blood supply increases. You will need about double the amount of iron than you do normally, which is about 27 milligrams per day.

If you’re deficient in iron, you can start to feel tired, weak, and dizzy. Your pregnancy glow can wane and you will look pale and probably find yourself breathless. On top of all your other pregnancy symptoms, this is no walk in the park (2).

Cooking some of your food in an old-fashioned iron skillet will leach iron into your meals, thus increasing your iron stores.

How to Choose an Iron Supplement

Narrowing down the ingredients that will benefit you can help you make an informed decision when choosing an iron supplement. Here are some of the things you should look for.

The Amount of Iron

We have mentioned that during pregnancy you should have 27 milligrams of iron a day. Remember, this won’t only come from the supplement — your body will absorb some from food as well. Consequently, a lower dose in a supplement is fine, as long as you’re also getting iron from your diet (3).

Vitamins

Many iron supplements will also contain vitamin C and other vitamins, like B12 and folates (vitamin B9). The vitamin C will help absorption of the iron while the B vitamins help prevent birth defects, like spina bifida and central nervous system disorders. Folates also help with the production of red blood cells, helping prevent anemia.

Tablet, Capsule, or Liquid

Iron supplements often have a metallic taste and some tablets and capsules can be large. If you find you can’t swallow what looks like a horse pill, then there are liquids and chewable tablets available.

Different Types of Iron

In supplements, you’ll find various iron sources such as elemental iron, ferrous fumarate, and ferrous sulfate, to name a few. You might find one type suits you better than another – if the one you choose gives you lots of side effects then change to a different type. Your healthcare provider should be able to advise you as to which type of iron you need.

Take Note

Before taking any iron supplement, always check with your doctor or OB provider to ensure the levels in your new supplement aren’t more than what you should be taking when combined with your prenatal vitamin.

The Best Pregnancy Iron Supplements of 2021

Here are 5 great iron supplements for pregnancy to consider.

1. MegaFood Blood Builder

Best Overall

This multivitamin and iron supplement from Mega Food is gentle on the stomach and should not cause constipation. Containing 26 mg of iron, it also has vitamin C to help iron absorption and vitamin B12 and folates for pregnancy health.

It’s available in four different sizes from 30 to 180 tablets. This is great because you can save money by buying in bulk.

Another great thing about these tablets is they are suitable for vegans and vegetarians. They are certified kosher and free from GMO. They have no dairy or soy and are also gluten-free.

Pros

  • Contains beetroot which can help lower blood pressure if your blood pressure is on the higher side (4).
  • Helps boost iron levels and prevent fatigue.
  • Tablets are not too large and shaped to be easy to swallow.

Cons

  • Some find the tablets taste metallic.

2. Blue Iron Liquid Mineral Supplement

Best Liquid

Flavored with blueberries, this liquid supplement from Blue Iron is suitable for vegans and vegetarians, and good for expectant moms. The recommended daily dosage of 15 milliliters will supply 25 mg of iron.

The addition of vitamin C, B12, and E enhance the formula, allowing you to absorb the iron easily and boost the production of hemoglobin. I like that this has a patented absorption which makes it gentle on your stomach and alleviates constipation associated with iron supplements.

It also contains biotin which can help the health of your unborn baby (5).

Pros

  • Contains folic acid.
  • Plant-based iron.
  • Dosage can be adjusted to supply less iron if necessary.
  • Many moms like the taste.

Cons

  • No other flavor options if you dislike the blueberry.
  • Contains less iron than the other brands.

3. Garden of Life Iron Complex

Best Capsule

This product is certified vegan, non-GMO, gluten-free, and is made from natural plant products. It is delivered in a single capsule, which measures just less than 1 inch. Although this is fairly large, it will slide down quite easily with a glass of juice or water.

As well as 22 mg of plant-based iron, it also contains vitamins B12 and C, and folates. It is easily digested and does not upset your stomach.

I particularly like that it also contains probiotics and enzymes, which can help support digestive health. They help the good bacteria in your stomach and help with diarrhea or constipation (6).

Pros

  • Made from organic natural plants and fruits.
  • Can be opened and added to juice or water.
  • Does not contain any binders or fillers.

Cons

  • Only 30 capsules in the bottle.
  • Only 22 milligrams of iron.

4. Floravital Liquid Iron Supplement

Best Vegan Tablets

Want an iron supplement that’s free from weird unnamed chemicals? Or are you a Jew with kosher dietary needs? Then Floravital is your supplement.

This brand offers a supplement that is free from preservatives and artificial coloring, as well as gluten, GMO, lactose, yeast and more. Yet, it has been licensed by the FDA as providing the Recommended Daily Allowance of iron for all women of childbearing age. Yep, whether you’re pregnant, lactating, expecting, or just menstruating, Floravital works for you.

Because it uses ferrous gluconate and fruit and herbal extracts, this supplement tastes good and won’t stop up your bowels. What’s more, it also contains vitamin C and B vitamins.

Pros

  • Tastes like fruit — yum!
  • No constipation.
  • Safe for all women of childbearing age.

Cons

  • Reviewers complain that the packaging was poor.
  • It starts to taste “off” if not consumed after a few months.

5. Natures Plus Chewable Iron Supplement

Best Chewable Tablets

Flavored with raspberry and cherry, these chewable tablets will deliver a dose of 27 mg of iron per tablet. They are suitable for vegetarians and are gluten-free.

Added vitamin C will help your body absorb the iron it needs from this product.

These are 100 percent made in the U.S. and are free from artificial preservatives and colorings. The dosage of these tablets is one a day, so with 90 in the bottle they should last three months.

Pros

  • Many love the taste.
  • Gentle on the stomach.
  • Natural ingredients.

Cons

  • Does not contain any added vitamins or folates.

Foods That Increase Iron Levels

Many foods contain iron and they can boost your levels. This is by far the best way to get that essential mineral into your body.

Some iron comes from animals and others from plants. While both contain iron, it’s not the same type.

Animal sources contain heme iron that is absorbed easier than that which comes from plants, called non-heme iron. Foods which are rich in iron include (7):

Animal Sources

  • Meat, including beef, turkey, lamb, chicken, pork, and veal.
  • Liver.
  • Seafood, including mackerel, haddock, sardines, and shrimp.
  • Eggs.
  • Shellfish, like clams, scallops, and oysters.

Avoid raw or unpasteurized eggs as well as limiting mercury-containing fish.

Plant Sources

  • Vegetables, including spinach, kale, collard greens, broccoli, string beans, and peas.
  • Bread, including whole wheat, rye, and enriched white.
  • Cereals, like bran and oats.
  • Beans, including kidney, white beans, and dried varieties.
  • Lentils and dried peas.
  • Corn and maple syrups and molasses.
  • Tofu.
  • Tomato products.
  • Fruits, including dates, strawberries, figs, prunes, and watermelon.
  • Dried fruits, like apricots and peaches.
  • Peanut butter.

Iron is absorbed better by our body when it’s accompanied by vitamin C. So help yourself to a nice chilled glass of orange juice with your iron-rich foods. If you’re having cereal, chop up some fresh strawberries in it (8).

Tea and coffee, as well as caffeinated drinks, are not your friend when it comes to iron absorption. It reduces the uptake of iron from your food, or a supplement. If you must have your daily caffeine fix, then make sure it’s a few hours after taking an iron supplement or iron-rich meal (9).

Another thing that can interfere with the absorption of iron is calcium. Make sure you don’t take a calcium supplement at the same time as an iron one. Also, avoid milk and other dairy products for an hour before and two hours after taking your iron boost (10).

Side Effects of Iron Supplements

Some of the common side effects associated with iron supplements include constipation, nausea, vomiting, and diarrhea. I know, you already have enough to contend with when you’re pregnant without adding more to the mix.

If they make you feel sick, try not to take them on an empty stomach. You can keep constipation at bay by increasing your fluid and fiber intake.

If any side effects are bothersome, then speak to your healthcare provider for advice and support (11).


Headshot of Mary Sweeney, BSN, RN, CEN

Reviewed by

Mary Sweeney, BSN, RN, CEN

Mary Sweeney, BSN, RN, CEN is an oncology nurse navigator and freelance medical writer. Mary has 4 years of experience as an officer in the Navy Nurse Corps. including emergency/trauma, post-anesthesia, and deployment medicine.