Diazolidinyl Urea, Imidiazolidinyl Urea, Methylisothiazolinone – They are almost guaranteed to irritate you. These ingredients all function as biocides – they kill living cells that they come in contact with. Calling them harsh is putting it lightly.
Diazolidinyl Urea aka 78491-02-8 / 1-(1,3Bis(hydroxymethyl)-2,5-dioxoimidazolidin -4-yl)-1,3- / Bis(hydroxymethyl) urea / Germall II / Germall 11
Imidazolidinyl Urea aka Imidurea / 39236-46-9 / 1,1′-methylenebis(3-(3(hydroxymethyl)-2,5-dioximidazolidin-4-yl)urea) / Germall 115
- Diazolidinyl Urea and Imidazolidinyl Urea are both antimicrobial preservatives that have been widely used in cosmetic preparations. Their manufacturing processes are protected patents. Their safe concentration limit is 0.1%.
- Both of these chemicals are known sensitizers; meaning that exposure can induce skin sensitivities and reactions including allergic contact dermatitis. They are also both known formaldehyde releasers. Other than this very little is stated by regulatory agencies about either of these chemicals, including their carcinogenic potential, as well as their longterm consequences for the environments that are exposed.
- Imidazolidinyl Urea was shown to induce apoptosis (cell suicide) at 0.001%-0.01% concentrations and necrosis (kills the cell) at 0.1% concentration during in vitro studies.
Methylisothiazolinone aka 2-Methyl-4-isthiazolin-3-one / 2682-20-4 / 2-methylisothiazol-3(2h)-one / 2-methyl-4-isothiazoline-3-one
- This water soluble biocide also has patented manufacturing processes and is only available from chemical vendors.
- Methylisothiazolinone had been assessed to be “safe” in cosmetic formulas at 100PPM or <0.01% of a formula. This preservative is a known skin sensitizer and is also known to irritate sensitive skin. The prevalence of allergic contact dermatitis reactions to methylisothiazolinone has increased as exposure in the general population has increased. Methylisothiazolinone has also demonstrated cross sensitivity with Phenoxyethanol.
- Methylisothiazolinone also shows that it has the ability to accumulate in aquatic life and ecosystems as well as presenting a hazard to some aquatic life.
All of these chemicals are known irritants, with known and unknown environmental hazards. They are caustic and corrosive at full strength and all require special handling with personal protective equipment. The natural biome of the skin must also be considered; emerging research shows that the health of our skin is partially dependent on certain beneficial bacterial flora being present. Knowing this, it is hard to believe that any kind of biocide is a smart option for anyone, especially those with sensitive skin. Stop poisoning yourself with these insidious additives. Your beauty routine deserves better.
Coming Up in your preservatives crash course: EDTA’s