Phytosphingosine
Also known as: 4-Hydroxysphinganine
Description
Phytosphingosine is a sphingoid base naturally present in the stratum corneum, where it serves as a metabolic precursor to ceramides — the predominant lipid class in the epidermal barrier. Beyond its structural role, phytosphingosine possesses intrinsic antimicrobial activity against Propionibacterium acnes, Staphylococcus aureus, and Malassezia species, as well as anti-inflammatory properties mediated through inhibition of pro-inflammatory cytokine release. It is used in skincare formulations to strengthen the barrier, reduce inflammation, and control microbial colonization.
Mechanism of Action
Phytosphingosine is enzymatically acylated by ceramide synthases in the epidermis to generate ceramides, particularly ceramide NP and ceramide AP, which are critical for lamellar body formation and barrier integrity. Its antimicrobial activity involves disruption of bacterial and fungal cell membranes through interaction with membrane lipids. Anti-inflammatory effects are mediated by suppression of NF-κB signaling, reducing production of TNF-α, IL-1β, and IL-8 in keratinocytes. It also promotes keratinocyte differentiation, supporting normal epidermal homeostasis.
Indications
- Acne vulgaris
- Atopic dermatitis
- Seborrheic dermatitis
- Impaired skin barrier
- Dry skin / xerosis
- Anti-microbial skin care
- Sensitive skin support
Available Concentrations
Side Effects
- Generally well tolerated
- Rare mild irritation at high concentrations
Contraindications
- Known hypersensitivity to phytosphingosine (extremely rare)
Pregnancy Category
Not classified (generally considered safe; naturally occurring skin lipid)