Skin Conditioning
STREPTOCOCCUS THERMOPHILUS LYSATE
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A lysate of the food-grade bacterium Streptococcus thermophilus. Conditioning, barrier-supporting ingredient with a decent emerging evidence base.
Streptococcus thermophilus is a food-grade Gram-positive bacterium used in yogurt starter cultures. Its lysate — the disrupted, non-viable cell fraction — contains peptides, sphingomyelinase (which may support ceramide production), polysaccharides, and metabolites. Small peer-reviewed studies describe improved skin barrier function and ceramide content when applied topically. No CIR monograph; no EU CosIng restriction. Lysates pose no infection risk since the bacteria are non-viable, and the parent organism has decades of GRAS food use.
Function
Skin benefits
- Probiotic-derived ferment active
- May support skin barrier and ceramide content
- Soothing profile in sensitive skin studies
- Food-grade microbial source
Known concerns
- Supplier-specific composition
- Lysate = non-living cell fragments; marketing may overstate 'live probiotic' effect
- Limited large-scale independent clinical data
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related skin conditionings
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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.