PEG-100 Hydrogenated Castor Oil

What is PEG-100 Hydrogenated Castor Oil?

PEG-100 Hydrogenated Castor Oil originates from castor beans (Ricinus communis seed oil), which undergoes hydrogenation for stability, followed by ethoxylation with about 100 ethylene oxide units to create a water-soluble derivative. This process yields an amphiphilic molecule with a hydrophilic polyoxyethylene chain and lipophilic fatty acid tails. Primarily used in rinse-off cleansers, shampoos, micellar waters, and aqueous lotions, it functions as a nonionic surfactant by reducing surface tension between water and oils. This allows hydrophobic ingredients like fragrances or essential oils to disperse evenly, preventing separation and enabling transparent, stable formulations. In emulsions, it stabilizes oil-in-water systems, while in cleansing products, it aids micelle formation to lift impurities without stripping skin's natural moisture barrier.

Comedogenic Rating 0/5 Low risk of clogging pores

EWG Safety Rating 3 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Fragrance ingredient

Contributes scent character and/or masks base odors, shaping the overall sensory experience of the formula (subject to allergen and IFRA considerations).

Surfactant

Lowers surface tension to enable cleansing, emulsifying, and foaming; central to shampoos, body washes, and many emulsions and micellar systems.

Cleansing agent

Removes dirt, oil, and impurities by lowering surface tension and forming micelles, enabling soils to be lifted and rinsed away from skin, hair, or teeth.

Solubilizing agent

Helps incorporate oils and fragrance into water-based formulas by forming micro-solutions, enabling clear sprays, toners, and micellar products.

Benefits

Facilitates incorporation of fragrances and oils into watery products for even scent distribution.

Enhances cleansing by forming micelles that lift dirt and excess sebum effectively.

Supports stable, clear textures in toners, sprays, and micellar solutions.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit	Who Should Avoid
Individuals using fragrance-heavy water-based cleansers or toners.	Those with known sensitivity to ethoxylated ingredients.
People seeking non-greasy, transparent skincare formulations.	People preferring strictly natural or PEG-free products.
Users of shampoos and body washes needing consistent performance.	Individuals concerned about potential manufacturing impurities.

Safety Notes

Cosmetic Ingredient Review experts deem it safe for use in cosmetics when formulated to limit impurities.
Low comedogenic potential, unlikely to clog pores based on ratings.

Frequently Asked Questions about PEG-100 Hydrogenated Castor Oil

What is PEG-100 Hydrogenated Castor Oil derived from?

It comes from hydrogenated castor bean oil, chemically modified with polyethylene glycol for water solubility.

Is it suitable for sensitive skin?

It shows low irritation potential in expert assessments, though patch testing is wise for sensitivities.

Does it help with product clarity?

Yes, it solubilizes oils and fragrances, creating stable, see-through water-based products.