What E422 actually is
Glycerol is a humectant, which means it holds water. That is why it keeps cake moist, stops icing cracking, and gives protein bars their chew instead of turning them into bricks. It is also mildly sweet, roughly 60 percent as sweet as sugar, and is the backbone molecule of every fat and oil.
What it is made from
Three routes. Most glycerol is a by-product of soap making and biodiesel production, where the fat source can be plant oil or animal tallow. Some is made by fermentation, and some synthetically from propylene. The finished molecule is identical regardless, which is exactly why the label cannot distinguish them.
Vegan, vegetarian, and halal status
This sits in the same category as E471: genuinely maker-dependent, and the code answers nothing. A certified vegan, vegetarian, halal, or kosher mark means the source has already been verified as part of that certification. Without a mark, ask the manufacturer. Note also that glycerine is chemically an alcohol in the same sense sugar alcohols are, and it is not intoxicating, so that name is not itself a halal concern.
Is E422 safe?
Glycerol is permitted with no numerical intake limit in the EU, UK, and US. The body metabolises it as it would any component of fat. One practical warning does exist and has caused real harm: slush ice drinks made with glycerol have caused hypoglycaemia and loss of consciousness in young children, and UK and Irish food safety bodies have advised against selling them to children under four and limiting them for under tens.
- UK and Irish food safety advice against glycerol slush drinks for children under four, following cases of hypoglycaemia
- Large quantities have an osmotic laxative effect
- Metabolised normally as part of fat, with no intake limit set
Where regulators stand
- EFSA (EU)
- Permitted with no numerical acceptable daily intake.
- FDA (US)
- Generally recognized as safe.
- FSA (UK)
- Advises glycerol slush drinks are not sold to children under four, with limits advised for under tens.
Foods it turns up in
- Cakes, icing, and fondant
- Protein and cereal bars
- Slush ice drinks
- Sugar-free and low-sugar confectionery
- Toothpaste, cosmetics, and medicines
Names it hides behind
- E422
- Glycerol
- Glycerine
- Glycerin
- Humectant (E422)
Common questions
- Is glycerine halal?
- It depends on the source. Plant-derived and synthetic glycerine is acceptable; tallow-derived is not unless it comes from a halal-slaughtered animal. The code does not say which, so look for a certification mark or ask the maker.
- Is glycerine vegan?
- Only when it is plant-derived or synthetic. A large share of commercial glycerol is a by-product of processing that can use animal fats, so a vegan mark is the reliable signal.
- Is glycerine alcohol?
- It is an alcohol in the chemical sense, like sugar alcohols, but it is not intoxicating and is not ethanol. That naming alone is not a halal concern.
- Why are slush drinks a problem for young children?
- Glycerol is used to stop them freezing solid. In small children a large quantity can cause hypoglycaemia and loss of consciousness, which is why UK and Irish advice is against selling them to under fours.
- Is glycerine the same as glycerol?
- Yes. Glycerol is the chemical name, glycerine and glycerin the common ones. All are E422.
Checking a real pack
This page answers the code. The pack in your hand is what decides, because the same code can come from different sources depending on the manufacturer. LabelWise, formerly SafeChoice, scans the label and explains what is in front of you.
LabelWise content is educational and describes how additives are made, regulated, and labelled. It is not medical, dietary, or religious advice. For certification questions, the mark on the pack and the certifying body are the authority.