Pork-Derived Ingredients in Medication: Heparin, Pancreatic Enzymes, and Gelatin

For many medicines, the pork question is about an inactive ingredient, such as the gelatin in a capsule shell. For a few, it is about the medicine itself. Heparin, the injected anticoagulant, is generally made from the intestinal lining of pigs. Pancreatic enzymes, taken by people whose pancreas cannot make enough of its own digestive enzymes, are of pig origin in every preparation with proven effectiveness, and a 2025 European guideline says there is currently no viable alternative for people who avoid pig-derived products.

That changes the practical question. For a filler, the answer is often a different capsule or a different manufacturer. For an active ingredient with no proven substitute, the answer is a conversation with your prescriber and your religious authority. This guide covers where pork-derived ingredients appear, who asks about them, and how to get the facts you need.

Heparin: generally made from pig intestines

FDA guidance on the heparin supply puts it plainly: making heparin generally involves extracting crude heparin from porcine intestinal mucosa, the lining of pigs’ intestines, and then purifying it. That crude heparin is often used to make other drugs too, including heparin for injection and the low molecular weight heparins. The FDA treats any non-pig material in heparin, especially material from cattle and other ruminants, as adulteration unless the drug’s approval specifically allows it. The same guidance notes that some medical devices are coated with heparin, which is worth knowing before a procedure.

It was not always this way. According to the FDA, the first heparin drugs approved in the United States, in the 1930s, were made from cow lung, and manufacturers withdrew bovine heparin from the US market in the late 1990s over concerns about “mad cow” disease, replacing it with heparin from pigs. Some pig-derived heparin was found to be contaminated in 2008, and the FDA says it has worked continuously since then to safeguard heparin and its supply chain. It also says it remains interested in alternatives to pig-derived heparin, and it has encouraged manufacturers to develop bovine heparin again. For now, though, heparin in the United States is generally pig-derived.

Whether an anticoagulant that is not made from animal tissue is an option for you is a question for your prescriber.

Pancreatic enzymes: when there is no proven alternative

Pancreatic enzyme replacement therapy is the treatment for pancreatic exocrine insufficiency, a condition in which the pancreas does not release enough digestive enzymes for normal digestion. A 2025 guideline from a group of European medical societies states that the most commonly used preparations are of pig origin, and that the preparations with evidence of efficacy are all porcine. It recommends that patients be told about the pig origin before they start treatment.

The guideline is also frank about alternatives. A non-porcine formulation was developed but failed to meet its main goal in a late-stage clinical trial, and plant-based or fungal preparations, though under development or available in some countries, have not yet had their efficacy well established. Its conclusion is that there is currently no viable alternative for patients who avoid porcine derivatives. It notes that some people who follow vegan or vegetarian diets, or who are of Jewish or Muslim faith, may ask for one.

Gelatin: the everyday pork-derived ingredient

The more familiar pork question in medicine is gelatin. Gelatin is common in capsule shells, and the medical literature describes it as coming from pigs or cattle. The ingredient list will usually say only “gelatin,” so the animal has to be confirmed with the manufacturer of the specific product. Gelatin can sometimes be avoided with a tablet or a gelatin-free capsule. Our gelatin guide covers those options and how to ask about them.

Who asks, and how traditions approach medical need

Many people avoid pork for religious reasons, and each tradition has its own way of thinking about medicine. A 2013 study in a medical ethics journal asked religious leaders about animal-derived medicines. The respondents for Sunni and Shiite Islam did not accept pork-derived drugs, and the Sunni respondent added that using such a drug is mandatory when no alternative treatment exists, because human life is considered more sacred than the prohibition. The respondents for Vaishnavism, the major branch of Hinduism, and for Sikhism did not approve of pork- or beef-derived products, but said the rules could be set aside in an emergency, or when no alternative existed and the treatment was considered life-prolonging. The authors note that these are the views of the leaders who replied, and that not every believer shares them.

The Seventh-day Adventist Church’s Fundamental Beliefs call members to “abstain from the unclean foods identified in the Scriptures,” and the church’s own encyclopedia traces how its teaching against eating pork developed. People who keep a vegetarian or vegan diet may ask about pork-derived medicines as well. For Islamic and Jewish guidance on medicine in more depth, including how scholars and certifiers treat necessity and illness, see our guides to halal medication and kosher medication.

How to check your medication

• Know the active ingredients to ask about. Heparin, low molecular weight heparins, and pancreatic enzymes are the main ones this guide covers.
• Read the inactive ingredients. Look for gelatin, and ask which animal it came from.
• Ask your pharmacist whether a tablet, a gelatin-free capsule, or another manufacturer’s version exists for any medicine where the pork question is about a filler.
• Before a procedure, tell your care team that you avoid pork-derived products, since heparin is given by injection and some medical devices are coated with it.
• Take the facts to your religious authority when a pork-derived medicine has no substitute.
• Look it up in the app. The AllergenMeds app flags ingredients like these in the exact product you look up, so you know which questions to ask.

infoThis guide is for education only, not medical advice. Always talk to your doctor or pharmacist before starting, stopping, or switching any medication.