Common Name(s): Oyster sterols,oyster sterols,marine bivalve phytosterols,unusual sterol blend

CAS Number: N/a

DESCRIPTION

What It Does: Provides marine-source phytosterol barrier lipid supplementation with anti-inflammatory 5-alpha reductase inhibitory activity from the c28–c30 unusual sterols not present in plant phytosterol blends.

Why It's Used: Oyster sterols are selected for their unique marine sterol fingerprint — the unusual c28–c30 methylenecholesterol and brassicasterol content provides sc barrier lipid restoration with a sterol diversity unavailable from conventional plant phytosterol sources.

How It Works: Oyster sterols: 24-methylenecholesterol + brassicasterol → sc lipid bilayer intercalation; sterol nucleus → cholesterol-like barrier lipid function; 5α-reductase inhibition → reduced sebum + anti-androgenic activity.

Typically Found In: Barrier care,anti-aging,marine beauty

TECHNICAL DETAILS

Primary Category: Active ingredient – antioxidant

Secondary Functions: Free radical scavenging,anti-aging

Application Areas:

Typical Concentration Range: 0.1%–5%

SOURCING & ETHICS

Vegan Status: No - animal-derived

Halal Status: Contested - marine invertebrate; madhhab-dependent (shafi'i and maliki permit broadly, hanafi restricts to fish), refer to certifier stance

Source Notes: Plant-derived extract or synthetic. [audit 2026-07-29 rev2: marine invertebrate; permissibility splits by school of law. determination requires shariah-panel sign-off.]

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low

Comedogenicity Rating: 0/5 – non-comedogenic

Sensitivity Concerns: Non-irritating; well-tolerated.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Excellent safety profile. ewg score: 1.

Works Well With: Vitamin c,vitamin e,ferulic acid,spf,other antioxidants

Avoid Combining With: No significant incompatibilities

SCIENTIFIC NOTE

Oyster sterols provide the marine-origin equivalent of plant phytosterol barrier repair — appropriate for marine-concept formulations where plant phytosterols are avoided.

Last Verified: 2026-03-22

Primary Sources: Cosing database,oyster sterols marine phytosterol barrier review