Methylpropanediol
AKA: 2-Methyl-1, 3-propanediol, 2163-42-0, 1, 3-Propanediol, .BETA.-HYDROXYISOBUTANOL, HSDB 7267, MP Diol, 3Propanediol, 2methyl
Synthetic
Humectant
Solvent
Synthetic
Clean
See also: Glycerin; methylpropanediol (component of).
Solubility In water, greater than or equal to 3000 mg/L at 25 °C
Formula
C4H10O2
Mol. Weight
90.12
CAS #
2163-42-0
Form
Liquid
State
Liquid
Functions
Humectant
A moisture magnet. Pulls water from the air and deeper skin layers up to the surface to keep skin plump and hydrated.
Solvent
Dissolves other ingredients so they distribute evenly in the formula. Often the invisible "base" everything else is mixed into.
Dissolves Ingredients
Dissolves other ingredients
Traditional Use
Insufficient ingredient name provided; cannot identify or describe traditional use.
Skin Types
●all-skin-types
Best For
General
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory0 listings
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
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Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR