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Preservatives & Stabilizers

Preservatives prevent microbial growth in cosmetics, and stabilizers protect formulas from oxidation and separation. This category explains why they are used and how safety is assessed. Browse 26 entries in this category.

Formulation tools, white granules, and an amber vial
Editorial illustration

Illustrated guides

Selected entries interpreted through varied editorial art and photography.

Two-tone linocut of an unlabelled amber vial and a clear droplet in a glass dish

Benzyl Alcohol

A cosmetic preservative and fragrance ingredient; a specific 5% drug lotion has separate head-lice evidence.Amber oil protected beneath a glass dome in a geometric still life

BHT

An oil-soluble antioxidant that protects formulas from oxidation, often confused with an antimicrobial preservative.Amber bottle and wax flakes on folded brown paper

Butylated Hydroxyanisole (BHA)

An antioxidant used to protect formulas from oxidation; not the beta hydroxy acid meant in exfoliating skincare.Clear cosmetic droplets and cream swatches in a geometric paper collage

Caprylyl Glycol

A multifunctional cosmetic diol that conditions skin and helps preservation systems work with less traditional preservative.Monoprint study of branching red seaweed beside a translucent gel swatch

Carrageenan

A red-seaweed food hydrocolloid whose texture role, molecular specifications and limited metabolic research need separate interpretation.Linocut illustration of an amber bottle and a powder dish

Chlorphenesin

A cosmetic preservative, distinct from chlorphenesin carbamate, with formulation-specific safety and occasional allergy reports.Charcoal drawing of a glass vial and ceramic powder tray

Dehydroacetic Acid

A cosmetic preservative often discussed alongside its sodium salt; it is not vinegar's acetic acid.Pencil and watercolor drawing of an amber jar and powder tray

Diazolidinyl Urea

A formaldehyde-releasing preservative, not the moisturizing urea used for dry or rough skin.Clear cosmetic liquid and an unlabelled laboratory vial in a paper collage

DMDM Hydantoin

A formaldehyde-releasing cosmetic preservative whose main practical concern is contact allergy in susceptible users.Ink-wash illustration of two glass vessels with clear liquid

Hexylene Glycol

A formulation solvent whose irritation behavior should not be inferred from another ingredient sharing the word glycol.Vellum collage of a clear gel fold in a shallow glass dish

Hydroxyethylcellulose

A modified-cellulose gel former; physical spreading and historical cosmetic compatibility do not certify a sterile medicine or protective biological effect.Pen-and-wash drawing of a glass jar and powder spoon

Imidazolidinyl Urea

A formaldehyde-releasing preservative with a separate chemical identity and allergy profile from diazolidinyl urea.Amber formulation vial and clear droplets in an archival paper composition

Methylchloroisothiazolinone

A highly efficient preservative usually paired with methylisothiazolinone and closely watched for contact allergy.Amber laboratory bottle, dark comb, and white flakes on charcoal slate

Piroctone Olamine

An antifungal cosmetic ingredient used mainly in anti-dandruff scalp formulas outside the U.S. OTC drug monograph system.Paper collage of a translucent gel ribbon beside a dark green comb

Polyquaternium-10

A cellulose-derived conditioning polymer whose surface-film behavior is a formulation property, not evidence of hair regrowth.A curled translucent film and two empty capsule shells on textured paper

Pullulan

A fermentation-derived film former used in cosmetics and capsule shells; safety assessments do not establish wrinkle treatment or fibre efficacy.Woodcut illustration of an amber jar and ceramic pot

Quaternium-15

A formaldehyde-releasing preservative with a significant contact-allergy context and region-specific regulatory history.A muted green monoprint of a brown-seaweed frond with a translucent gel-like brush mark on cream paper.

Sodium Alginate

A brown-seaweed hydrocolloid whose food texture role and finished reflux formulations require different kinds of evidence.

Preservatives & Stabilizers

  1. 01Benzyl AlcoholA cosmetic preservative and fragrance ingredient; a specific 5% drug lotion has separate head-lice evidence.
  2. 02BHTAn oil-soluble antioxidant that protects formulas from oxidation, often confused with an antimicrobial preservative.
  3. 03Butylated Hydroxyanisole (BHA)An antioxidant used to protect formulas from oxidation; not the beta hydroxy acid meant in exfoliating skincare.
  4. 04Caprylyl GlycolA multifunctional cosmetic diol that conditions skin and helps preservation systems work with less traditional preservative.
  5. 05CarrageenanA red-seaweed food hydrocolloid whose texture role, molecular specifications and limited metabolic research need separate interpretation.
  6. 06ChlorphenesinA cosmetic preservative, distinct from chlorphenesin carbamate, with formulation-specific safety and occasional allergy reports.
  7. 07Dehydroacetic AcidA cosmetic preservative often discussed alongside its sodium salt; it is not vinegar's acetic acid.
  8. 08Diazolidinyl UreaA formaldehyde-releasing preservative, not the moisturizing urea used for dry or rough skin.
  9. 09DMDM HydantoinA formaldehyde-releasing cosmetic preservative whose main practical concern is contact allergy in susceptible users.
  10. 10EDTAThe chelator that keeps products fresh — it traps the metals that spoil formulas, with a heavy-metal medical past.
  11. 11EthylhexylglycerinThe preservation booster with skin benefits — a mild humectant that makes 'paraben-free' systems actually work.
  12. 12Hexylene GlycolA formulation solvent whose irritation behavior should not be inferred from another ingredient sharing the word glycol.
  13. 13HydroxyethylcelluloseA modified-cellulose gel former; physical spreading and historical cosmetic compatibility do not certify a sterile medicine or protective biological effect.
  14. 14Imidazolidinyl UreaA formaldehyde-releasing preservative with a separate chemical identity and allergy profile from diazolidinyl urea.
  15. 15MethylchloroisothiazolinoneA highly efficient preservative usually paired with methylisothiazolinone and closely watched for contact allergy.
  16. 16MethylisothiazolinoneThe preservative that caused a real allergy epidemic — effective at tiny doses, infamous for leave-on sensitivity.
  17. 17ParabensThe most studied cosmetic preservatives ever — safe at legal levels per every major regulator, despite two decades of controversy.
  18. 18PhenoxyethanolThe workhorse cosmetic preservative that replaced parabens — safe at legal limits, controversial at bath-time for infants.
  19. 19Piroctone OlamineAn antifungal cosmetic ingredient used mainly in anti-dandruff scalp formulas outside the U.S. OTC drug monograph system.
  20. 20Polyquaternium-10A cellulose-derived conditioning polymer whose surface-film behavior is a formulation property, not evidence of hair regrowth.
  21. 21Potassium SorbateThe gentle, effective preservative that keeps food, wine, and cosmetics from molding — among the best safety profiles in its class.
  22. 22PullulanA fermentation-derived film former used in cosmetics and capsule shells; safety assessments do not establish wrinkle treatment or fibre efficacy.
  23. 23Quaternium-15A formaldehyde-releasing preservative with a significant contact-allergy context and region-specific regulatory history.
  24. 24Sodium AlginateA brown-seaweed hydrocolloid whose food texture role and finished reflux formulations require different kinds of evidence.
  25. 25Sodium BenzoateThe anti-mold workhorse — the preservative in half the skincare aisle, safe at regulated levels with one vitamin-C caveat.
  26. 26Sodium MetabisulfiteThe sulfite antioxidant that keeps wine and dried fruit fresh — and the most common hidden trigger of sulfite sensitivity.