Phytosphingosine

INCI: Phytosphingosine 

Category: Sphingoid Base / Ceramide Precursor / Antimicrobial Barrier Active 

Used in: Barrier repair moisturisers, acne formulas, sensitive skin treatments, scalp treatments 

Typical Usage Level (Topical): 0.05–0.2%

What This Ingredient Does

Phytosphingosine is a naturally occurring sphingoid base found in the uppermost layers of the skin and in yeast. It serves as a direct biosynthetic precursor to phytoceramides  meaning the skin can convert applied phytosphingosine into ceramides endogenously, supporting ceramide replenishment from within rather than only from topically applied ceramide molecules. Beyond ceramide synthesis, phytosphingosine has direct antimicrobial activity against Cutibacterium acnes and Staphylococcus aureus, two bacteria central to acne and atopic dermatitis respectively. It also modulates the skin microbiome by selectively inhibiting pathogenic bacteria while remaining compatible with commensal organisms. Its role at the intersection of ceramide production, barrier integrity, and microbiome regulation makes it a functionally dense ingredient that supports multiple aspects of skin health simultaneously.

Works most effectively when formulated alongside Ceramide NP, Ceramide AP, Ceramide EOP, and Cholesterol for a complete barrier repair system. In acne formulas, it complements Niacinamide and Zinc PCA.

Also listed under: Functional Skin Support — cross-reference for additional context.

Key Benefits

• Converts to phytoceramides in the skin, supporting endogenous ceramide replenishment

• Direct antimicrobial activity against C. acnes and S. aureus relevant for acne and eczema management

• Modulates the skin microbiome without broad-spectrum disruption of commensal bacteria

• Reinforces lipid lamellar structure when used alongside full ceramide complex

• Effective at low concentrations potent activity without formulation constraints

Who It's Best For

• Acne-prone skin with concurrent barrier disruption addresses both concerns simultaneously

• Eczema or atopic skin where S. aureus colonisation compounds inflammation

• Those using ceramide-based barrier repair formulas phytosphingosine supports ceramide synthesis from within

• Scalp conditions involving barrier disruption and microbial imbalance

Clinical Note by Dr. Su

Phytosphingosine does something most barrier ingredients cannot it supports ceramide production endogenously rather than simply depositing ceramides on the surface. Combined with its antimicrobial properties, it is one of the most multi-functional lipid-category ingredients available. In a complete barrier repair formula, it belongs alongside the ceramide complex rather than as a standalone replacement.

References

• Pavicic T, et al. (2007). Efficacy of cream-based novel formulations of hyaluronic acid of different molecular weights in anti-wrinkle treatment. (phytosphingosine barrier reference context)

• Bibel DJ, et al. (1992). Sphingosines: antimicrobial barriers of the skin. Acta Dermato-Venereologica. PMID: 1357887