When To Stop Taking Calcium Tablets During Pregnancy?

Most pregnant women can stop taking calcium tablets at 37 weeks of pregnancy, though some healthcare providers recommend continuing until birth. The reason is simple: your baby’s skeleton is mostly formed by the final weeks, and the body’s calcium needs shift. Before you make any changes to your prenatal routine, talk with your obstetrician or midwife about your specific situation. They will consider your diet, your bone health, and any conditions like preeclampsia risk that may change the recommendation.

Why Do Pregnant Women Take Calcium in the First Place?

Calcium is a building block for your baby’s bones and teeth. During pregnancy, your body works hard to deliver about 50 to 60 grams of calcium to your growing baby, most of it in the third trimester. If you do not get enough from food, your body will draw calcium from your own bones to meet the demand. That is why prenatal vitamins often include calcium, and why many doctors recommend extra calcium tablets for women who do not consume enough dairy or other calcium-rich foods.

Calcium also plays a role in muscle function, nerve signaling, and blood clotting. Some research suggests that adequate calcium intake during pregnancy may reduce the risk of preeclampsia, a serious blood pressure condition. However, the evidence for this benefit is stronger in women who have low calcium intake to begin with, particularly in populations where dietary calcium is generally low.

When To Stop Taking Calcium Tablets During Pregnancy: The 37-Week Rule

The most common guidance is to stop calcium supplements at 37 weeks of pregnancy. By this point, your baby’s bones have largely finished calcifying. The intense transfer of calcium from your blood to your baby slows down considerably. Continuing high-dose supplements after this time does not provide additional benefit for the baby’s skeleton.

There is another reason for the 37-week cutoff. Some studies have raised a concern about calcium supplements and the risk of kidney stones or constipation in the mother. These side effects are more likely with high doses, especially in the later stages of pregnancy when the digestive system is already slowed down by hormones. Stopping at 37 weeks also avoids any theoretical interference with labor. The evidence here is not strong, but many clinicians prefer to err on the side of caution.

This timing is not a strict medical law. Some guidelines suggest continuing until delivery, especially if your dietary calcium intake is low. The key is that you should not decide on your own. Your healthcare provider can assess your individual risk factors and give you a clear answer.

What If You Have Preeclampsia Risk or Gestational Hypertension?

If you have been diagnosed with preeclampsia or are at high risk for it, the recommendation may be different. Some clinical guidelines recommend calcium supplementation of 1,000 to 1,500 mg per day specifically for women with low dietary calcium intake to reduce preeclampsia risk. In these cases, stopping at 37 weeks may not be appropriate.

Your doctor may want you to continue calcium until delivery if the supplement is being used as part of a treatment plan for blood pressure management. This is a clinical decision that depends on your blood pressure readings, urine protein levels, and overall health. Do not stop taking calcium because of a general rule if your doctor has given you a specific reason to continue.

What Are the Signs That You Should Stop Earlier?

Some women experience side effects that make continuing calcium tablets uncomfortable or unwise. Severe constipation that does not respond to dietary changes is a common complaint. Calcium supplements, especially calcium carbonate, can worsen constipation during pregnancy. If you are struggling with this, talk to your provider about switching to a different form of calcium or adjusting your dose.

Kidney stones are another reason to stop. If you have a history of kidney stones or develop symptoms like sharp back pain, blood in the urine, or pain during urination, stop taking calcium and contact your doctor immediately. Calcium supplements can increase the amount of calcium in your urine, which raises the risk of stone formation in susceptible women.

Some women feel nauseated after taking calcium tablets, particularly in the first trimester when morning sickness is common. If you cannot keep the tablets down, do not force them. Your doctor can help you find a calcium form that is gentler on your stomach, such as calcium citrate, which is better absorbed and less likely to cause digestive upset.

How Much Calcium Do You Actually Need in the Third Trimester?

The recommended daily intake of calcium during pregnancy is 1,000 mg for most women. This is the same amount recommended for non-pregnant adults. Pregnant teenagers need slightly more, around 1,300 mg per day.

Food sources are always the preferred way to get calcium. One cup of milk contains about 300 mg. A cup of fortified orange juice has about 350 mg. A serving of yogurt provides roughly 300 to 400 mg. Leafy greens like kale and broccoli contribute smaller amounts. If you are eating a balanced diet with two to three servings of dairy or fortified alternatives daily, you may not need a supplement at all.

Your prenatal vitamin likely contains some calcium, usually between 200 and 300 mg. If you are also taking a separate calcium tablet, the combined total matters. The upper limit for calcium from supplements and food combined is 2,500 mg per day for pregnant women. Going above this level does not provide extra benefit and can cause problems like kidney stones or impaired absorption of iron and zinc.

What Happens to Your Bones After You Stop Calcium?

Pregnancy naturally causes some bone density loss, especially if your calcium intake is not adequate. This is usually temporary. Your body typically recovers bone mass in the months after childbirth, particularly if you are breastfeeding and then return to normal hormone levels.

Stopping calcium tablets at 37 weeks does not mean you should stop thinking about calcium after birth. If you breastfeed, your calcium needs remain high. Breastfeeding women need about 1,000 mg of calcium per day, and the body continues to prioritize milk production over your own bone stores. A well-balanced diet with adequate calcium and vitamin D is important throughout the postpartum period.

Vitamin D is essential for calcium absorption. Without enough vitamin D, your body cannot use the calcium you consume, whether from food or supplements. Most prenatal vitamins contain vitamin D, and your doctor may check your levels if you have risk factors for deficiency.

Can You Take Too Much Calcium During Pregnancy?

Yes. Excessive calcium intake during pregnancy is possible and can be harmful. Taking more than 2,500 mg per day from all sources combined can lead to hypercalcemia, a condition where too much calcium circulates in your blood. Symptoms include nausea, vomiting, confusion, and in severe cases, kidney damage.

This is rare with typical supplement doses, but it can happen if you are taking multiple supplements that each contain calcium. Check the labels of your prenatal vitamin, calcium tablets, and any antacids you may be using. Many antacids contain calcium carbonate, and taking them alongside calcium supplements can add up quickly.

If you are unsure how much calcium you are getting, keep a simple tally for a few days. Add up the calcium from your prenatal vitamin, any separate supplement, and your food. If the total is well above 1,000 mg, talk to your provider about whether you need all of it.

What To Do If You Missed the 37-Week Mark

If you are already past 37 weeks and still taking calcium tablets, do not panic. You have not harmed yourself or your baby. Simply discuss the timing with your provider at your next appointment. Some doctors will tell you to continue until delivery, especially if your dietary calcium is low. Others will recommend stopping right away.

The decision to stop is not an emergency. It is a routine part of pregnancy management. What matters more than the exact week is that you are getting enough calcium throughout pregnancy and that you are not taking excessive amounts. Your provider will give you a clear recommendation based on your health history and current status.