Vegan Medication: The Animal-Derived Ingredients Hiding in Pills and Capsules

A medication can fail to be vegan even when the drug itself has nothing to do with animals, because of the inactive ingredients around it. The ones that come up again and again are gelatin in capsule shells, lactose from milk, carmine coloring from insects, shellac from the lac insect, and vitamin D3 made from lanolin in sheep wool. A second group, including magnesium stearate, can come from either plants or animals, and the label does not say which.

None of this means you have to choose between your health and your values. The Vegan Society defines veganism as seeking to exclude the exploitation of animals “as far as is possible and practicable,” and it says plainly that it does not recommend avoiding medication your doctor has prescribed. What you can do is find out what is in your medication and ask whether an animal-free version exists. This guide shows you where to look.

The animal-derived ingredients most likely to turn up

• Gelatin. Made from the skin and bone of animals, usually cattle and pigs, and the main reason capsules are often not vegan. Gelatin-free capsules exist; our gelatin guide covers the alternatives.
• Lactose. The sugar from milk, used as a filler in tablets. Our lactose guide explains where it shows up and how to find versions without it.
• Carmine and cochineal extract. Colorings made from cochineal insects. FDA regulations permit them for coloring medicines taken by mouth. They are worth knowing even if you are not vegan: after reports of severe reactions to foods and cosmetics, including anaphylaxis, the FDA concluded that they may cause potentially severe allergic responses.
• Shellac. A resin secreted by the lac insect, used in some medicines.
• Lanolin, and the vitamin D3 made from it. Lanolin comes from sheep wool. It is also the usual starting material for vitamin D3, which matters for any medicine or supplement that contains D3.

The ingredients that could go either way

Some inactive ingredients are not animal-derived or plant-derived by definition. They can be made from either, and the finished ingredient carries the same name. Magnesium stearate, a common lubricant in tablets and capsules, and stearic acid, the fatty acid it is made from, are the classic examples. Stearic acid can come from plant oils such as cottonseed, coconut, and palm, or from animal fat such as tallow.

Here the odds favor you. As of 2022, research by The Vegetarian Resource Group found that plant sources, especially coconut and palm oils, were the major ones used to make magnesium stearate for both food and medicine. But the same group is careful to say it cannot claim all magnesium stearate is plant-based, and drug labels are not required to state the source. So for a specific product, the only way to be sure is to ask its manufacturer. Our alpha-gal medication guide covers these source-dependent ingredients in more depth, because for people with alpha-gal syndrome the same question is a medical one.

Vitamins and supplements: the vitamin D3 question

Vitamin D is an easy one to miss. According to the NIH Office of Dietary Supplements, vitamin D3 is typically produced from lanolin obtained from sheep wool, while vitamin D2 is made from yeast. An animal-free vitamin D3 sourced from lichen is also available. The ODS suggests that people who avoid all animal-sourced products contact supplement manufacturers to ask about their sourcing. Supplements raise other ingredient questions too, which our guide to allergens in vitamins and supplements covers.

What to expect when you ask

Asking is worth it, but it helps to go in with realistic expectations. Sometimes your pharmacist can find a different manufacturer or a different form of the same medicine, and the problem simply goes away. Sometimes a manufacturer can tell you that an either-way ingredient in its product is plant-derived. And sometimes the answer is less tidy. The Vegan Society’s 2023 article on medicines notes that a manufacturer is not always able to guarantee the source of its inactive ingredients, and that there are times when no alternative to a medicine with an animal-derived ingredient exists.

In that situation, the same article says, the decision about which medicines you need should be made together with your healthcare professional. That is a reasonable place to land: ask the question every time, choose the animal-free option when there is one, and when there is not, make the call with your prescriber or pharmacist rather than on your own.

How to check whether your medication is vegan

• Read the inactive ingredients. Look for gelatin, lactose, carmine or cochineal, and shellac. Vitamin D3 (cholecalciferol) is usually made from lanolin unless the maker says it comes from lichen.
• Flag the either-way ingredients. If you see magnesium stearate or stearic acid, the label cannot settle it. Note them as questions, not answers.
• Ask your pharmacist whether an animal-free version exists: a tablet instead of a gelatin capsule, a different manufacturer, or a different form of the same medicine.
• Ask the manufacturer about the source of any either-way ingredient. The answer can differ between makers, so ask about the product you actually have.
• Check again when something changes. A new manufacturer or a new formulation can mean new ingredients, even for the same medicine.
• 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.

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