Ingredient guide · C

Castor Oil

Castor seed oil is a thick, nourishing plant oil widely used in UK beauty products for its ability to moisturise, condition and add shine. It is a staple in lip balms, mascaras, hair treatments and cleansing oils thanks to its versatility and natural feel.

Castor Seed Oil — Castor seed oil is a vegetable oil pressed from the seeds of the castor bean plant (Ric… | UK Lips ingredient guide

How it works in skincare

In cosmetics and skincare, castor seed oil functions as an emollient and occlusive agent that helps lock in moisture while creating a smooth, protective layer on skin and hair. Its unique ricinoleic acid content gives it excellent pigment-dispersing properties, making it a favourite in lipsticks, mascaras and colour cosmetics where it helps pigments glide evenly and stay put. It also adds viscosity and a glossy finish to formulations without feeling overly greasy when used at the right levels.

Key benefits

  • Deeply moisturises and softens dry skin
  • Conditions and adds shine to hair
  • Helps soothe and calm dry, flaky lips
  • Improves smoothness and softness of skin
  • Enhances pigment dispersion in lip and eye products
  • Creates a protective barrier that locks in moisture

Best for

dry skin, mature skin, sensitive skin, dull or dehydrated skin

Where it comes from

Castor seed oil is a vegetable oil pressed from the seeds of the castor bean plant (Ricinus communis), a shrub native to eastern Africa and now grown in many tropical and subtropical regions.

Products with Castor Oil

Not every product on UK Lips lists a full ingredient breakdown — so there may be many more formulas that contain Castor Oil than we can show here. These are the comparisons where we’ve confirmed it in the listed ingredients.

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