October 26, 2026 Editorial directory · Not a shop

Shown: ricinoleic acid, the main fatty acid in castor oil. This is not the triglyceride oil.

Ingredient

Castor Oil

Ricinus Communis (Castor) Seed Oil — major fatty acid Ricinoleic Acid: C18H34O3; N/A single formula (natural fixed oil)

Strong consumer interest in natural haircare, scalp care, and hair-growth ingredients. Castor Oil combines a natural botanical positioning with hair conditioning and scalp-care benefits, making it highly visible in the HairGrowth and Natural HairCare trend. Kitsch…

Strong consumer interest in natural haircare, scalp care, and hair-growth ingredients. Castor Oil combines a natural botanical positioning with hair conditioning and scalp-care benefits, making it highly visible in the HairGrowth and Natural HairCare trend. Kitsch also highlights Castor Oil as a key ingredient in its Smoothing Air Dry Cream.

Trend evidence

Position Castor Oil as a Natural HairGrowth / Scalp Care trend ingredient, rather than a clinically proven hair-regrowth active. Its strongest established cosmetic functions are conditioning, emollience, moisturization, smoothing, and improving hair feel.

https://journals.sagepub.com/doi/10.1177/10915818251361102

Official page

What it does

Hair conditioning; emollient; moisturizing; smoothing; improves softness and shine; helps reduce dryness and frizz.

Notes

Biological / industrial source: Extracted from the seeds of Ricinus communis (castor plant) through pressing and refining; naturally rich in Ricinoleic Acid.

R&D / institution: Cosmetic Ingredient Review (CIR) — reviewed the safety of Ricinus Communis (Castor) Seed Oil and related castor-derived ingredients.

Developer / supplier: OLVEA; Gustav Heess; Sophim; Croda.

Origin: Originally native to tropical Africa; India is a major commercial production region.

Representative product: Kitsch Smoothing Air Dry Cream.

Approx. retail price: US$16–32 / 5.3 oz.

Evidence maturity: Mature Ingredient — strong cosmetic-use evidence; limited clinical evidence specifically supporting hair regrowth.

Publishing notes: Position Castor Oil as a Natural HairGrowth / Scalp Care trend ingredient, rather than a clinically proven hair-regrowth active.

Products with this ingredient