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Is Cyclopentasiloxane safe on skin (left on)?

Personal care1 use researched3 sourced claims

Where it turns up: volatile silicone, solvent, hair conditioner. Detox My Life researched cyclopentasiloxane under one use, because the same substance means something different in each use. Every claim below carries its evidence tier, how sure the research is that it applies here, and the sources it cites. The level is computed by the app's own deterministic engine, so the page says exactly what the app would.

Level by use and lens

UseMainstreamCautious (default)BasedConcerns · favour · fringe
On skin, left onSwapSwapSwap3 · 0

Mainstream shows consensus claims only; Cautious adds emerging research; Based adds fringe claims, labelled as such. The last column counts, under Cautious, the sourced concerns, the findings in its favour and the fringe claims Based would add.

Safer swaps: the app's swap catalog has no entry tied to this ingredient yet. When you scan a product that contains it, the app suggests cleaner alternative types for that product; the swap categories list what the catalog covers today.

On skin, left on Swap

Under the default Cautious lens cyclopentasiloxane on skin (left on) rates Swap: the app would put this near the top of your swap plan. Mainstream (consensus only) rates it Swap; Based (adds the fringe) rates it Swap. Researched 2026-09-03.

Sourced concerns (3)

ConsensusRestrictedconfidence 100%

Cyclopentasiloxane will be restricted to a maximum concentration of 0.1% in leave-on cosmetic products in the European Union from June 2027 due to its classification as a Substance of Very High Concern (SVHC) for being very persistent and very bioaccumulative in the environment.

Why here
This regulatory action directly limits the use of cyclopentasiloxane in dermal leave-on products.
What would have to be true
Dermal application of leave-on cosmetic products containing cyclopentasiloxane above 0.1% in the EU after June 2027.
The other side
The US Environmental Protection Agency (EPA) and Health Canada have concluded that D5 does not pose a risk to the environment, citing its evaporation from the skin and exhalation, and that it does not bioaccumulate to harmful levels.
Sources the engine cites (no regulator, review or study among them):
  • 4 web articles (I Read Labels For You, StyleSpeak, BeautyMatter, …), linked in the app.
EmergingEndocrineconfidence 80%

Cyclopentasiloxane is linked in some studies to endocrine disruption, with the Environmental Working Group (EWG) expressing a low concern for its potential to interfere with normal hormone function.

Why here
The concern is about potential systemic effects after dermal exposure.
What would have to be true
Dermal application of cosmetic products, particularly at concentrations higher than typically found in cosmetics.
The other side
The Cosmetic Ingredient Review (CIR) Expert Panel considers cyclopentasiloxane safe at existing concentrations, as it is minimally absorbed into the skin and evaporates quickly, making systemic accumulation unlikely.
Sources the engine cites:
EmergingIrritant · allergenconfidence 80%

Some individuals with sensitive or reactive skin may experience mild irritation, dryness, or allergic reactions from cyclopentasiloxane, especially when used in high concentrations.

Why here
This is a direct dermal reaction to the ingredient in leave-on products.
What would have to be true
Dermal application of leave-on cosmetic products containing cyclopentasiloxane, particularly for individuals with sensitive skin or at high concentrations.
The other side
Cyclopentasiloxane is generally considered non-irritating and well-tolerated, with research suggesting it may even prevent irritation in patients with conditions like rosacea.
Sources the engine cites:

Not researched here

The engine has no dossier for cyclopentasiloxane when cooked with heat, in cold food, as a finishing ingredient, in heated food packaging or other uses. The app researches an ingredient for the use it infers from your product, so a scan fills these in; this page only shows what has already been researched and source-verified.

This is research, not medical advice. Detox My Life shows sourced claims sorted by evidence tier. It does not diagnose, treat, or tell you to start or stop anything. Talk to a qualified professional about your health.

Scan your own. The app reads any product label with your camera, works out how you are about to use it, and researches every ingredient for that use with live sources. Every scan adds to a Detox Score for your home, where 50 is a typical home in your region, and a plan of next swaps.

See also: all ingredients · paste a label to check it · how to read an ingredient flag