Is Magnesium stearate (E470b / INS 470b) Halal?
magnesium stearate is doubtful (mushbooh) — its halal status depends on the source. Used as anti-caking agent.
Why this status?
Used as anti-caking agent. Stearic acid source may be animal.
Editorial summary
This summary is editorial and is general information, not a religious ruling. The status above is unchanged.
What it is
Magnesium stearate, also listed as E470b, is the magnesium salt of stearic acid. It is used as an anti-caking and flow agent, which is why it is so common in tablets, capsules, powdered supplements and seasoning blends, where it keeps ingredients from sticking to equipment.
Why the status depends on the stearic acid
Stearic acid is a fatty acid that comes from vegetable fats such as palm or cottonseed oil, or from animal fats including tallow, which can include pork fat. Plant-derived stearate is halal, and animal-derived stearate depends on the animal and the slaughter. Our rating is doubtful because a label that says only magnesium stearate gives no source. The amount used is tiny, but the source still matters to those who follow the stricter view.
Reading a label
Look for magnesium stearate, vegetable magnesium stearate and E470b in supplements and medicines, and for a halal certificate or a statement of vegetable origin. Many supplement makers say on the label or website whether their stearate is vegetable-sourced, and a halal-certified supplement settles the question. Ask the manufacturer when no information is available.
Common products
Magnesium stearate is most common in supplements, tablets, capsules and some medicines, where it prevents the ingredients from sticking to machinery. It also appears in some seasoning mixes, powdered sweeteners and candies. A halal-certified supplement covers it, and many brands state that theirs is vegetable-derived, so check the brand's website or contact the company.
In short
In short, magnesium stearate is halal when the stearic acid comes from plants and doubtful when it may come from animal fat. The amount is tiny, but certified or vegetable-labeled supplements remove the question.
Also listed on labels as
magnesium stearate can appear on an ingredient list as E470b.
What to ask the manufacturer
Ask the manufacturer in writing where the ingredient comes from: whether it is plant, microbial or animal in origin, and if it is animal, which animal and how it was slaughtered. Ask whether any alcohol was used as a solvent or carrier, and whether the product carries a halal certificate from a body your local authority recognizes. Keep the answer, because suppliers and recipes change.
Sources
Classification based on clinical nutrition assessment; no independent published study cited.
Reviewed by Habib Aman, Islamic Scholar, MBA — last reviewed September 27, 2026.
This is general guidance for everyday shopping, not a religious ruling. Formulations vary by manufacturer and country — confirm with the manufacturer or your local scholar when it matters.
Checking a whole product?
SafaScan is a halal scanner app that is coming soon. It will check magnesium stearate and every other ingredient on a product. Sign up for launch updates. Learn about SafaScan.
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