Last reviewed May 2026 · 1 min read

Is Galactooligosaccharides (GOS) vegan?

Also known as: GOS

Not Vegan

Derived from animals — avoid.

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In short

No — Commercially synthesized from lactose (milk sugar).

01 · The basics

What is Galactooligosaccharides (GOS)?

A popular prebiotic fiber used to feed beneficial gut bacteria.

02 · The source

Where it comes from

Commercially synthesized from lactose (milk sugar). Since lactose is a dairy byproduct, GOS is not vegan.

03 · Alternatives

Best vegan alternatives

Fructooligosaccharides (FOS)

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Inulin

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Frequently asked

FAQ

Is GOS vegan?

No, Galactooligosaccharides are derived from cow's milk.

Commonly found in

Prebiotic supplementsInfant formulaGut health powders

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A source of the essential trace element molybdenum, used in supplements and agriculture.

Magnesium Citrate

Vegan

A magnesium preparation in salt form with citric acid, used as a supplement and a saline laxative.

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E542 (Bone phosphate)

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Used as an anti-caking agent, emulsifier, and source of phosphorus in supplements.

Ghee

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Clarified butter commonly used in Indian cooking.

Lard

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A semi-solid white fat product used in baking and frying.

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