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E421SweetenerLow concern
Mannitol
In plain words
The short version
A sugar alcohol from seaweed and tree saps — used as a non-cariogenic sweetener and tablet excipient.
Why it's green
It's widely considered safe at the amounts used in food, so we mark it green. The Safety section below has the details.
Safety profile
ADI not specified — considered safe. Like other polyols, large oral doses (~20 g) can cause a laxative effect. Slow GI absorption and partial colonic fermentation. Non-cariogenic — does not feed dental-plaque bacteria.
The detail
Educational information only. Not medical or dietary advice.