INCI: Phytosphingosine - Also known as: 4-Hydroxysphinganine, (2S,3S,4R)-2-Aminooctadecane-1,3,4-triol

QUICK FACTS

What is Phytosphingosine?

Phytosphingosine is a naturally occurring sphingoid base - a long-chain amino alcohol that forms the backbone of the sphingolipid family of lipids, including all ceramides. It is characterized by its 18-carbon chain, three hydroxyl groups, and a primary amine group - a molecular architecture that gives it both the structural properties of a ceramide precursor and independent biological activity in the skin. In the skin's own chemistry, phytosphingosine is found in the stratum corneum as a free sphingoid base and as the backbone of Ceramide NP, Ceramide AP, and Ceramide EOP - three of the four ceramide types present in Sweet Chemistry's formulas.

What distinguishes phytosphingosine from many cosmetic lipids is its studied dual character: it functions as both a topical ceramide precursor (potentially entering the ceramide biosynthesis pathway in the skin) and as an independent active with its own researched surface associations. Research has explored phytosphingosine's interaction with the skin's microbiome environment and its association with the skin surface conditions linked to acne-prone, easily congested, and sensitive skin types - properties that broaden its relevance beyond a simple ceramide manufacturing input.

At Sweet Chemistry, phytosphingosine is present alongside cholesterol and ceramides in all four formulas - at 0.2% as a standalone in the Oil-Serum's barrier lipid complex, and as part of the three-way 3% blend with ceramides and cholesterol in the three water-based formulas. Its universal presence reflects its classification as a foundational sphingolipid component rather than a peripheral addition.

What does it do for skin?

Phytosphingosine's contribution to skin operates through two studied pathways. First, as a ceramide biosynthesis precursor, it is studied in connection with the skin's own serine palmitoyl transferase and ceramide synthase pathways - the enzymatic cascade through which the skin generates its own ceramides. Research suggests that topical phytosphingosine may be incorporated into this pathway, potentially supporting the skin's endogenous ceramide production rather than solely replenishing ceramide levels topically. This gives phytosphingosine a complementary role to the directly delivered ceramides in the same formula - topical replenishment and biosynthesis support working from two directions.

Second, phytosphingosine's independent association with skin surface conditions has been studied in connection with the balance of the skin's microbiome environment. Research has explored its association with Cutibacterium acnes (formerly Propionibacterium acnes) activity, where it may contribute to a more balanced skin surface environment - a finding that makes it relevant not just for barrier-compromised skin but also for congestion-prone and acne-associated skin types. This is a research-based association formulated within a cosmetic system, not a drug-level treatment claim.

In the Oil-Serum at 0.2% as a free sphingoid base within the anhydrous barrier lipid complex, phytosphingosine works alongside Ceramide NP, Ceramide NG, cholesterol, linoleic acid, and linolenic acid - completing the structural sphingolipid environment of the waterless formula. In the water-based formulas, its blend with ceramides EOP, AP, and NP (plus cholesterol) provides one of the more complete barrier lipid systems available in the over-the-counter skincare category.

FOUND IN

In All 4 Formulas

Phytosphingosine is present in every Sweet Chemistry formula - at 0.2% in the Oil-Serum and as part of the 3% ceramide/phytosphingosine/cholesterol blend in all three water-based products. Its universal presence reflects its status as a foundational sphingolipid component of the barrier lipid system.

Nourishment - All Skin Types

Barrier Repairing Hydra-Serum Phytosphingosine (part of 3% barrier lipid complex) - 1.0 oz / 30 ml

The Hydra-Serum delivers phytosphingosine alongside Ceramide NP, Ceramide AP, and cholesterol within a 40%-active water-based emulsion - a complete sphingolipid and sterol barrier approach for all skin types.

Hydration - Dry to Normal

Elasticity Reinforcing Hydra-Cream Phytosphingosine (part of 3% ceramide/phytosphingosine/cholesterol blend) - 1.7 oz / 50 ml

The Hydra-Cream delivers phytosphingosine within a full three-ceramide (EOP, AP, NP) and cholesterol barrier complex alongside 3% Matrikynes® peptides and 2% THD ascorbate.

Hydration - Dry to Dehydrated

Elasticity Reinforcing Lipid-Cream Phytosphingosine (part of 3% ceramide/phytosphingosine/cholesterol blend) - 1.7 oz / 50 ml

In the Lipid-Cream, phytosphingosine completes the full barrier lipid complex within the richest formula in the lineup, alongside shea butter, nourishing seed oils, and 3% Matrikynes® peptides.

Nourishment - Dry to Combination

Barrier Repairing Oil-Serum Phytosphingosine (0.2%) - 1.0 oz / 30 ml

The Oil-Serum delivers phytosphingosine at 0.2% as a standalone free sphingoid base within the anhydrous barrier lipid complex - alongside Ceramide NP, Ceramide NG, 1% cholesterol, and the omega fatty acid complex in a 100%-active waterless formula.

WORKS TOGETHER WITH

Barrier Lipid Ceramide NP + Ceramide AP + Ceramide EOP

INCI: Ceramide NP, Ceramide AP, Ceramide EOP.

Present across all three water-based formulas alongside phytosphingosine as the primary ceramide types in the barrier lipid system. Synergy Note: Phytosphingosine is the sphingoid base backbone of Ceramide NP and Ceramide AP - it is the molecular precursor to the ceramides it is co-formulated with. Together they provide both the finished ceramide and the biosynthetic precursor to the same barrier lipid structure.

Barrier Lipid Cholesterol

INCI: Cholesterol.

Present at 1% in the Hydra-Serum and Oil-Serum; part of the 3% barrier blend in both creams. Synergy Note: Ceramides, phytosphingosine, and cholesterol form the complete sphingolipid and sterol barrier system - the three components most directly associated with the structural integrity of the stratum corneum's intercellular lipid matrix.

NMF Amino Acid Serine

INCI: Serine.

Present in the amino acid blend in all three water-based formulas. Synergy Note: Serine is the starting substrate for the ceramide biosynthesis pathway that phytosphingosine is also part of - both ingredients are associated with the ceramide synthesis cascade from different points, creating a more complete biosynthesis-supportive approach within the same formula.

ECM Peptide Complex Matrikynes® Bone Peptides

INCI: Hydrolyzed Cow Bone Extract.

At 3% in all four formulas, associated with improvements in the appearance of skin density and aging signs. Synergy Note: A ceramide-replete, sphingolipid-supported barrier environment - to which phytosphingosine contributes from both the topical and biosynthetic dimensions - creates better surface conditions for the deeper dermal-targeting activity of Matrikynes® peptides.