oil
Silybum Marianum Seed Oil
A botanical seed oil from milk thistle rich in linoleic acid and silymarin polyphenols. Used in prestige colour cosmetics for antioxidant and skin-soothing support.
Benefits
- High linoleic acid (>60%) — barrier-compatible emollient
- Silymarin (silybin) antioxidant complex
- Hepatoprotective flavonolignans with topical anti-inflammatory activity
- Supports skin barrier via linoleic acid delivery
- Unique among seed oils for the silymarin co-fraction
Example uses
- Powder blush formulas with antioxidant claims
- Face oils
- Anti-inflammatory skincare
- Sensitive skin oil formulas
- Radiance-boosting face oils
Mechanism of action
Linoleic acid as omega-6 PUFA may support ceramide-2 synthesis. Silybin (the major silymarin component) inhibits NF-κB signalling and ROS generation in UV-irradiated keratinocytes. However, silymarin concentration in the seed oil phase is substantially lower than in polar extract fractions.
Clinical evidence · Emerging
Silymarin anti-inflammatory mechanism characterised in vitro; topical studies exist for pharmaceutical-grade silymarin extract. Specific studies for topical silybum marianum seed oil at cosmetic concentrations are limited.
Effective concentration range
0.5–5%
Formulation notes
High PUFA content — oxidation-prone. Requires tocopherol antioxidant protection. UV-protective packaging. Compatible with most cosmetic oils.
Watchouts
The oil form contains significantly less silymarin than the seed extract — silymarin is preferentially extracted in polar solvents, not oil. The silymarin benefit from the oil phase formulation may be very limited.
Controversies & overclaims
The silymarin anti-inflammatory benefit claimed from oil-phase formulations may be largely unavailable — silymarin is preferentially in polar extraction fractions, not oil. This formulation-chemistry reality is not communicated in marketing.
Market positioning
Marketed as antioxidant milk thistle oil. Linoleic acid emolliency is accurate. Silymarin availability from oil-phase formulations is questionable.
Comedogenicity
3 / 5
Sensitisation risk
Low
INCI & aliases
Silybum Marianum Seed Oil
milk thistle seed oil · silymarin source oil
Clean beauty perception
Accepted in clean beauty as botanical antioxidant oil. Milk thistle's hepatoprotective reputation from oral supplements adds consumer credibility.
Related ingredients
Graph relationships
Timeline