Mannitol
Also listed as E421.
SweetenersCAS: 69-65-8
This is what the ingredient is.
Mannitol is a sugar alcohol found naturally in seaweed, mushrooms, and fruits.
Here is why it shows up on the label.
It works as a sweetener (50-70% sweetness of sugar) and anti-caking agent. Used in chewing gum and pharmaceutical tablets.
Here is what food agencies say.
The FDA lists Mannitol as Generally Recognized as Safe. Europe approves it as additive E421.
Here is what research has found.
Lower glycemic impact than sugar. Poor intestinal absorption leads to laxative effects at moderate doses.
Here are a few things worth knowing.
Laxative effect at doses above 10-20g. May cause bloating and digestive discomfort.
Sources
- FDA GRAS
- EFSA E421
How to read this page
We publish plain facts about this ingredient so a label is easier to read. This is not medical advice, and it is not a recommendation to buy, avoid, or use anything. For a personal health question, talk with a clinician who knows your history.
v1.0Updated 9/12/2026