A synthetic biguanide compound, listed as an antioxidant.
What it is
o-Tolyl biguanide is 1-(2-methylphenyl)biguanide, a synthetic organic compound with a biguanide group attached to a tolyl ring. CosIng lists it as an antioxidant.
Where it is used
Appears on the ingredient lists of a small number of products.
Limits of interpretation
The INCI list shows which ingredients are present, not how much of each. Above 1%, ingredients are listed in descending order of weight; below 1% the order is free.
Functions
- Antioxidant
- Inhibiting reactions promoted by oxygen, thus avoiding oxidation and rancidity.
EU regulation
This ingredient is not listed in the annexes of Regulation (EC) No 1223/2009 in the CosIng data.

