Are Frosted Flakes Vegan? (No: Vitamin D3) US & UK Frosties Checked

Frosted Flakes have one of the shortest ingredient lists in the cereal aisle: corn, sugar, malt flavor and salt. The problem is in the vitamins added at the end. Like many fortified cereals, they contain vitamin D3, which is almost always made from sheep's wool.

Frosted Flakes ingredients explained

Kellogg's describes Frosted Flakes as "4 simple ingredients plus 8 vitamins and minerals". Here's each one:

Ingredient	Status	Why
Milled corn	Vegan
Sugar	Grey area	US cane sugar may be filtered with bone char.
Malt flavor	Vegan	Made from barley and corn. Contains gluten.
Salt	Vegan
Iron, niacinamide, B6, B2, B1, folic acid, B12	Vegan	Synthetic or fermented vitamins.
Vitamin D3	Not vegan	Usually made from lanolin (sheep's wool grease).

There are no artificial colors or flavors, no high-fructose corn syrup and no BHT in the current US recipe.

Why vitamin D3 matters

Cereals are often fortified with vitamin D, which comes in two forms. Vitamin D2 comes from fungi and yeast and is vegan. Vitamin D3 is usually made from lanolin, the waxy coating on sheep's wool, though a vegan version made from lichen exists. Kellogg's doesn't say which D3 it uses, and lanolin-based D3 is the industry norm.

The amount is tiny, and some vegans eat D3-fortified cereal anyway. We list it as not vegan because the ingredient comes from an animal, and we'd rather you know. It's the same reason Apple Jacks and many other cereals don't make the vegan cereal list.

Frosted Flakes varieties

Variety	Status	What decides it
Frosted Flakes (original)	Not vegan	Vitamin D3.
Reduced Sugar Frosted Flakes	Not vegan	Vitamin D3.
Chocolate Frosted Flakes	Not vegan	Vitamin D3; check for milk.
Milkshake and limited-edition flavors	Not vegan	Vitamin D3; flavors may contain milk.
Frosted Flakes cereal bars	Check the label	Bars often add milk ingredients.

UK and Irish Frosties

In Ireland and the UK the cereal is called Frosties. The ingredients are maize, sugar, barley malt extract and salt, plus niacin, iron, vitamin B6, riboflavin, thiamin, folic acid, vitamin D and vitamin B12. The label just says "vitamin D" without naming the form, which usually means D3. So Frosties are in the same position as US Frosted Flakes.

Frosties milk cereal bars contain milk and aren't vegan.

Are Frosted Flakes vegetarian or gluten-free?

Vegetarian: yes. Lanolin is collected from wool, so most vegetarians are fine with it.
Gluten-free: no. The malt flavor comes from barley.
Dairy-free: the original cereal is, but you'll be pouring milk on it, so use oat, soy or almond milk.

Vegan alternatives to Frosted Flakes

Cereal	Status	Ingredients
Good & Gather Organic Frosty Flakes (Target)	Vegan	Organic corn, organic cane sugar, sea salt.
Annie's Organic Frosted Oat Flakes	Vegan	Whole grain oats and wheat, cane sugar, tapioca syrup, sea salt, natural flavor, vitamin E.
Unfortified organic corn flakes	Usually vegan	Check there's no vitamin D3 or honey.

These are unfortified, so there's no D3 to worry about. Unfortified cornflakes also make a good crumble topping, as in our peaches and cream with cornflake crumble. For more options, see the vegan cereal list.

The bottom line

Frosted Flakes and Frosties are plant-based except for one ingredient: vitamin D3. Whether that matters is your call, but if you want a strictly vegan frosted cereal, choose an unfortified organic brand.

FAQ

Are Frosted Flakes vegan?

No. They contain no dairy, egg or honey, but they're fortified with vitamin D3, which is usually made from lanolin in sheep's wool.

Do Frosted Flakes contain milk?

No. The original cereal is dairy-free. The vitamin D3 is the only animal-derived ingredient. Some flavored versions, such as milkshake flavors, should be checked for milk.

Is vitamin D3 always from sheep's wool?

No. It can also be made from lichen, which is vegan. But cereal makers rarely use lichen-based D3, and when they do, they usually say so.

Are UK and Irish Frosties vegan?

Not clearly. Frosties sold in Ireland and the UK are made from maize, sugar, barley malt extract and salt, but they're fortified with vitamin D, and the label doesn't say which form. It's usually D3 from lanolin.

Are Frosted Flakes vegetarian?

Yes. Vitamin D3 from lanolin comes from wool, not from slaughter, so most vegetarians eat it.

Are Frosted Flakes gluten-free?

No. The malt flavor is made from barley, which contains gluten.

Are Reduced Sugar Frosted Flakes vegan?

They're fortified the same way, so check the label for vitamin D3. If it's listed, they're not vegan by our standard.

Who makes Frosted Flakes now?

WK Kellogg Co, which Ferrero bought in September 2025. Outside North America, Frosties are made by Kellanova, now owned by Mars.

Are Frosted Flakes Vegan?