Preservative
A preservative is an ingredient used mainly to inhibit microbial growth in a cosmetic product, especially water-based formulas used repeatedly over time.
At a glance
- Water-based skincare usually needs preservation.
- Preservatives protect the product; they are not treatment actives.
- EU cosmetic rules use Annex V as the positive list for permitted preservatives.
On this page
The short answer
A preservative helps stop bacteria, yeast, and mould from growing in a cosmetic product.
EU cosmetics law defines preservatives as substances mainly intended to inhibit the development of microorganisms in the cosmetic product[1]. That is refreshingly plain for regulation: preservatives keep products from becoming unsafe.
Why skincare uses preservatives
Most skincare is not dry powder in a sealed lab. It is water, oils, humectants, fingers, bathroom air, and weeks or months of use.
That is why ingredients such as phenoxyethanol, sodium benzoate, potassium sorbate, and dehydroacetic acid exist. They protect the formula. They are not there to moisturise, exfoliate, or fade marks.
ECHA describes Annex V of the EU Cosmetic Products Regulation as the list of allowed preservatives, including maximum concentration limits, restrictions, and special labelling requirements[2].
What to do if preservatives bother your skin
Some people react to specific preservative systems. That is real. It is also not a reason to fear every preserved product.
If the same rash or itch keeps returning, compare ingredient lists and consider patch testing. If you tolerate a product well, the preservative is doing the quiet job you want it to do.
Mads's practical read
Preservatives are not the villain in a simple routine. A contaminated cream would be much worse.
Respect reactions when they happen. Otherwise, let preservatives stay boring. Boring is exactly the point.
Keep reading
Common questions
Are preservatives bad in skincare?
No. In water-based products, preservation is often part of product safety. The right question is whether the preservative system is suitable and whether you personally tolerate it.
Why do moisturisers need preservatives?
Many moisturisers contain water and are opened repeatedly. Preservatives help prevent bacteria, yeast, and mould from growing during normal use.