D6, a volatile silicone like D4 and D5. Fine on skin, but persistent in the environment — the EU restricts it in leave-on and wash-off products from 2026.
Environmental concern
Also written D6
Ingredients
Look up anything on a label — by its scientific name or the one you know.
4 ingredients · Emollient · Avoid
ClearA mix of volatile silicones — mostly D5, sometimes D4 and D6. Silky on skin, but all three build up in the environment, and the EU restricts them.
Environmental concern
D5, the most common volatile silicone — it gives a silky feel, then evaporates. Fine on skin, but it builds up in the environment, so the EU restricts it in wash-off products (since 2020) and in leave-on products (from 2026).
Environmental concern
Also written D5
D4, a volatile silicone. Classed in the EU as possibly harmful to fertility and as persisting in the environment, so it's restricted in wash-off products since 2020 and in leave-on products from 2026.
Hormone concernEnvironmental concern
Also written D4