PCA Dimethicone
Silicone with PCA group attached; softer than classic dimethicones. Functional formulation ingredient with no standalone activity on the skin.
Supporting ingredient
It gives a product its texture, stability or shelf life. It has no claimed effect on the skin, so an efficacy tier does not apply. What is known about its safety is below
Tolerability and safety
- Irritation potential
- Low
- Allergen risk
- Low
- Pregnancy
- Safe
About this ingredient
PCA Dimethicone is a modified silicone, with a PCA group (pyrrolidone carboxylic acid) attached to the dimethicone molecule. Combines properties of an occlusive silicone and a humectant. Mechanism. Forms a thin film on the skin like ordinary dimethicone, but the PCA fragment additionally pulls moisture from the air. Dual action – occlusive + humectant in one molecule. Where applied. Dry-skin creams, makeup primers, hair products. Concentration 1–5%. In niche cosmetics. Evidence base. No clinical RCTs required – a functional filler. CIR confirmed safety. Safety. Hypoallergenic, non-comedogenic. Pregnancy and lactation – topically safe.
Frequently asked questions
Is PCA Dimethicone safe during pregnancy?
PCA Dimethicone is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What is PCA Dimethicone and what does it do in cosmetics?
Silicone with PCA group attached; softer than classic dimethicones.
What's the INCI name for PCA Dimethicone?
The INCI name is PCA Dimethicone.
See PCA Dimethicone in a product composition right on the store page
The Evigrade extension adds an evidence panel to iHerb, Sephora, Druni and 12 more stores. This ingredient and every other one in the product show evidence-tier, allergen risk and pregnancy/lactation flags at a glance.
Similar role in the formula
Other functional ingredients
Pectin, PEG-10 Dimethicone, PEG-10 Isostearate, PEG-10 Phytosterol, PPG-1 Trideceth-13, Terpineol, Caprylic/Capric/Succinic Triglyceride, Glycereth-26
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