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Skin Conditioning

STREPTOCOCCUS THERMOPHILUS

70

Safety score · 0–100

Fine

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

About

A yoghurt-culture lactic acid bacterium used in skincare for microbiome support. GRAS in food, with limited cosmetic-specific safety data.

Streptococcus thermophilus is a lactic acid bacterium widely used in dairy fermentation (yoghurt) and recognised as GRAS for food use. In cosmetics it is added either as a live, heat-killed, or lysed culture for skin-microbiome support and conditioning. There is no SCCS or CIR opinion on the cosmetic use of the species; toxicology relies on its long food history and supplier dossiers. Whole bacterial preparations may rarely sensitize and require careful preservation/sterility control. EU CosIng allows it without restriction.

Function

SKIN CONDITIONING - EMOLLIENT, SKIN PROTECTING, SKIN CONDITIONING - HUMECTANT, SKIN CONDITIONING - MISCELLANEOUS

Skin benefits

  • Probiotic-style microbiome conditioning
  • GRAS food-grade parent organism
  • Generally low irritation

Known concerns

  • Live or lysed bacterial material can rarely sensitize
  • Microbial purity depends on producer
  • No SCCS or CIR opinion

References

EU

EU CosIng database

European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.