By HRS Food · Published · Reviewed
Marshmallows explained: how do sugar and air become fluffy?
A marshmallow is a sweet foam: many tiny air bubbles are held in a sugar-based structure. Gelatine helps support that structure in many conventional recipes. The air is a physical ingredient in the fluffy texture, even though you do not see air listed like a flavour on the front of the bag. [1][2]
What is inside a fluffy marshmallow?
Candy-chemistry teaching materials describe marshmallow as a mixture containing dispersed air bubbles. It is not a solid white block. Those small spaces help explain its lightness and the way it compresses.
Many traditional formulations use sugar syrups and gelatine to support the foam. This is a general explanation of the structure, not an exact recipe or a claim that every marshmallow has the same proportion of air.[1]
Is a marshmallow just a large gummy sweet?
No. An aerated foam and a relatively dense gummy have different structures, even when both recipes use a gelling ingredient.
What does gelatine do in marshmallows?
Gelatine is one way of giving a sweet mixture enough structure to hold its aerated form. The current UK HARIBO Chamallows declaration lists gelatine alongside sugar, glucose syrup and other ingredients.
Other products may be made to different recipes. A white or pink colour does not tell you whether a particular marshmallow is vegetarian or vegan. Use the exact maker’s declaration for any alternative formulation.[2]
How should you compare marshmallow products?
Look at the named format and intended use: small pieces for toppings, larger pieces for sharing, or a product sold for toasting. Size changes how you serve them; it does not prove a different gelling ingredient.
The HRS Chamallows link is a marshmallow example. The Squashies link is a related soft gum for texture comparison, not a marshmallow substitute with an identical recipe. Keep ingredient and allergen information with each product when preparing a mixed selection.[2]
Compare the differences at a glance
Explore the difference
Air bubbles
Part of the foam’s physical structure.
| Look for | What it tells you |
|---|---|
| Air bubbles | Part of the foam’s physical structure. |
| Sugar-based mixture | The sweet material surrounding the bubbles. |
| Gelling ingredient | Helps support the finished structure in the named recipe. |
Related confectionery at HRS Food
HARIBO Chamallows is the marshmallow example. Original Squashies is a different soft gum included for a useful texture comparison.
Product images identify the named retail or case formats; quantities are set by the linked listing and your selected option. Use the current product page and physical pack for ingredients, allergens, dietary suitability and storage. Recipes and available formats can change.
Customer questions, answered
Sources and how we checked
Written by HRS Food. Brand and science references checked on ; HRS product examples checked against the live catalogue. The cited regional product is identified where market recipes differ. This is an independent educational guide. The illustrations explain structure and are not evidence of a private manufacturing recipe.