Tripropylene Glycol
AKA “TPG, Propylene Glycol Oligomer”
Humectant
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Ingredient Facts
Tripropylene glycol
AKA: TPG, Propylene Glycol Oligomer
Humectant · Antioxidant · EWG: 1
Synthetic
Antioxidant
Humectant
Emulsifier
Clean
Propanol, [(1-methyl-1,2-ethanediyl)bis(oxy)]bis-
CAS #
24800-44-0
See origin →
Functions
Antioxidant
Fights free radicals — the unstable molecules from UV, pollution, and stress that break down collagen and cause premature aging.
Emulsion Stabilising
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Humectant
A moisture magnet. Pulls water from the air and deeper skin layers up to the surface to keep skin plump and hydrated.
Locks In Moisture
Traditional Use
A synthetic polymer derived from propylene glycol, developed in the mid-20th century for cosmetics. Used as a humectant and solvent to improve hydration and product consistency.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
1
CIR
Safe as used
Pregnancy
Yes
Restricted By
CIR Safety Findings
medical-approval
all-shades-safe
Regulatory Agencies
Safety Assessment of Propylene Glycol, Tripropylene Glycol and PPGs as Used in Cosmetics
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Tripropylene Glycol
European Commission
EU Cosmetic Ingredient Database (CosIng)
Tripropylene Glycol
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Safety assessment of propylene glycol, tripropylene glycol, and PPGs as used in cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2012
Safety assessment of propylene glycol, tripropylene glycol, and PPGs as used in cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2012
Safety assessment of propylene glycol, tripropylene glycol, and PPGs as used in cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2012
Safety assessment of propylene glycol, tripropylene glycol, and PPGs as used in cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2012
Safety assessment of propylene glycol, tripropylene glycol, and PPGs as used in cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2012
Safety assessment of propylene glycol, tripropylene glycol, and PPGs as used in cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2012
Safety assessment of propylene glycol, tripropylene glycol, and PPGs as used in cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2012
Safety assessment of propylene glycol, tripropylene glycol, and PPGs as used in cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2012
Safety assessment of propylene glycol, tripropylene glycol, and PPGs as used in cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2012
Safety assessment of propylene glycol, tripropylene glycol, and PPGs as used in cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2012
Safety assessment of propylene glycol, tripropylene glycol, and PPGs as used in cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2012
Safety assessment of propylene glycol, tripropylene glycol, and PPGs as used in cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2012
Safety assessment of propylene glycol, tripropylene glycol, and PPGs as used in cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2012
Safety assessment of propylene glycol, tripropylene glycol, and PPGs as used in cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2012
Safety assessment of propylene glycol, tripropylene glycol, and PPGs as used in cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2012
Safety assessment of propylene glycol, tripropylene glycol, and PPGs as used in cosmetics.
Fiume MM, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2012
Verified Jun 2026
Data: CosIng · EWG · CIR