Are Collagen Peptides Safe In Pregnancy Risks To Know?

You have probably seen collagen peptides on social media or at the store. They are marketed for skin, hair, nails, and joints. If you are pregnant, you want to know if they are safe. The short answer is that collagen peptides are generally recognized as safe for most pregnant people when taken in normal food amounts. But there are important details about sourcing, dosage, and what the evidence actually says. This article walks through what you need to know.

What Are Collagen Peptides and How Do They Work?

Collagen is the most abundant protein in your body. It is a key building block for your skin, bones, tendons, and ligaments. Collagen peptides are broken-down pieces of collagen from animal sources like cows, pigs, or fish. Your body absorbs these small pieces more easily than whole collagen protein.

Once absorbed, the peptides travel through your bloodstream. They can signal your own cells to make more collagen. This is why people take them for skin elasticity and joint comfort. During pregnancy, your body is already making more collagen to support your growing uterus and baby. Taking extra collagen peptides is a way to support that natural process.

The main amino acids in collagen are glycine, proline, and hydroxyproline. These are not essential amino acids — your body can make them. But some research suggests that supplementing with them may help when demand is higher, like during pregnancy.

Are Collagen Peptides Safe In Pregnancy Risks To Know

Yes, collagen peptides are generally safe during pregnancy for most women. The FDA classifies collagen as Generally Recognized as Safe (GRAS). That means it has a long history of safe use in food. Most pregnant women can take collagen peptides without problems.

But there are real risks to know. The biggest risk is contamination. Collagen supplements are not tightly regulated. Some products may contain heavy metals like lead or cadmium. A 2023 investigation by Consumer Reports found detectable levels of lead and cadmium in several popular collagen powders. These heavy metals can cross the placenta and may harm fetal development.

Another risk is digestive upset. Collagen peptides can cause bloating, gas, or diarrhea in some people. Pregnancy already changes your digestion. Adding a new supplement can make that worse.

There is also a theoretical concern about glycine. Collagen is very high in glycine. Some animal studies suggest very high doses of glycine may affect pregnancy outcomes. But those studies used amounts far higher than what you get from a normal serving of collagen. Human data on this is lacking.

To reduce risk, choose a brand that tests for heavy metals. Look for third-party testing seals from organizations like USP or NSF International. Start with a small dose — half a scoop — and see how you feel before increasing.

How Much Collagen Is Safe During Pregnancy?

There is no official pregnancy-specific recommendation for collagen peptides. General guidelines suggest 10 to 20 grams per day is safe for most adults. That is about one to two scoops of most collagen powders.

During pregnancy, your protein needs increase. The recommended dietary allowance (RDA) for protein during pregnancy is about 71 grams per day. A serving of collagen provides about 10 to 11 grams of protein. That can help you meet your higher protein needs, but it should not replace other protein sources.

Collagen is not a complete protein. It lacks the essential amino acid tryptophan. It is also low in several other amino acids. Relying only on collagen for protein would be a bad idea. Think of it as a supplement to a balanced diet, not a replacement for whole protein foods like meat, eggs, beans, or dairy.

If you are unsure about your protein intake, talk to your healthcare provider. They can help you figure out a safe range for your specific situation.

What Does the Research Say About Collagen and Pregnancy?

The direct research on collagen peptide use during pregnancy is very limited. There are no large clinical trials testing safety specifically in pregnant women. Most of what we know comes from general safety data and animal studies.

One 2019 review in the journal Nutrients looked at collagen supplements for skin health. It found they were well-tolerated in adults. But the review did not include pregnant women. Another study from 2021 examined collagen hydrolysate for joint pain. It also excluded pregnant participants.

Animal studies raise one caution. High-dose glycine supplementation in pregnant rats has been linked to changes in fetal growth. But the doses used were much higher than what a human would get from collagen. A normal serving of collagen provides about 2 to 3 grams of glycine. The rat studies used glycine doses equivalent to 20 to 30 grams for a human. That is a big difference.

The bottom line is that the lack of human research means we cannot say collagen is proven safe for pregnancy with 100% certainty. But the evidence we have — general safety data, long food use, and known biology — suggests it is low-risk for most people.

Marine Collagen vs. Bovine Collagen During Pregnancy

Collagen comes from different animal sources. The two most common are bovine (cow) and marine (fish). Both have similar safety profiles during pregnancy, but there are differences worth knowing.

Bovine collagen is the most studied type. It comes from cow hides. It contains mainly type I and type III collagen, which are the types found in skin, bones, and tendons. Bovine collagen is generally safe, but make sure it comes from grass-fed cows to reduce the risk of contaminants.

Marine collagen comes from fish skin and scales. It is mostly type I collagen. Some people prefer it because it is easier to digest and has a milder taste. But marine collagen may carry a higher risk of heavy metal contamination, especially if the fish come from polluted waters. Look for brands that test for mercury and other metals.

There is no clear winner for pregnancy safety. Both are safe when sourced from reputable companies. The more important factor is the brand’s testing and quality control, not the animal source.

Collagen Peptides vs. Collagen-Rich Foods in Pregnancy

You can get collagen from food without taking a supplement. Bone broth is the most well-known source. It is made by simmering animal bones and connective tissue for hours. This releases collagen and gelatin into the broth.

Other foods that support your body’s own collagen production include chicken skin, fish skin, pork skin, and cuts of meat with connective tissue like oxtail or shank. These foods provide collagen directly. They also provide other nutrients like zinc, vitamin C, and copper that your body needs to make collagen.

Eating collagen-rich foods during pregnancy has the same safety considerations as supplements. The main difference is that you are getting collagen in a whole food form, which may be more natural and less processed. Bone broth is generally safe during pregnancy, but make sure it is properly cooked and stored to avoid bacterial contamination.

If you prefer supplements, that is fine. Just know that whole food sources provide additional nutrients that collagen powders lack. A mix of both is a reasonable approach.

When to Avoid Collagen Peptides During Pregnancy

There are some situations where you should avoid collagen peptides or be extra cautious. If you have a fish or shellfish allergy, avoid marine collagen. If you are allergic to beef, avoid bovine collagen. These are rare but real concerns.

If you have liver or kidney disease, talk to your doctor before taking collagen. Collagen is high in protein and certain amino acids that can stress these organs. Pregnancy already increases the workload on your kidneys and liver. Adding a supplement may not be wise.

If you have gestational diabetes or are watching your blood sugar, check the label. Some collagen powders contain added sugars, flavors, or other ingredients that can raise blood sugar. Plain unflavored collagen is usually the safest choice.

If you are taking blood thinners like warfarin, be cautious. Collagen contains vitamin K, which can interfere with these medications. The amount is small, but it is worth mentioning to your doctor.

How to Choose a Safe Collagen Supplement for Pregnancy

Not all collagen supplements are the same. Here is what to look for when you are pregnant.

• Third-party tested. Look for a seal from USP, NSF International, or ConsumerLab. This means an independent lab checked the product for purity and contaminants.
• Heavy metal testing. The brand should publish or provide heavy metal test results on request. Avoid any brand that cannot show you this data.
• Grass-fed or wild-caught. For bovine collagen, choose grass-fed. For marine collagen, choose wild-caught fish from clean waters. This reduces the risk of toxins.
• No added ingredients. Avoid collagen blends with herbs, adaptogens, or other supplements not tested for pregnancy safety. Stick to plain collagen peptides.
• Unflavored. Flavored versions often contain artificial sweeteners or sugar. Unflavored is the cleanest option.

Start with a single ingredient. If you tolerate it well, you can continue. If you feel bloated or nauseous, stop and talk to your provider.

What About Collagen in Prenatal Vitamins or Drinks?

Some prenatal vitamins and pregnancy drinks now include collagen. This is a newer trend. The same safety considerations apply. Check the source and testing of the collagen in these products.

Keep in mind that prenatal vitamins already contain iron, calcium, and other minerals. Adding collagen may affect how your body absorbs these nutrients. Collagen can bind to some minerals and reduce absorption. This is usually not a problem with normal doses, but it is something to be aware of.

If you are already taking a prenatal vitamin, you do not need to add a separate collagen supplement unless you have a specific reason. Your prenatal vitamin provides the nutrients your body needs to make its own collagen.