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Description
Pure Castor Oil100% PureCold PressedHexane FreeVegan The lash and brow oil 90% ricinoleic acid, the highest concentration of any plant oil on earth. Cold pressed from Ricinus communis seeds, nothing added, nothing removed. Castor oil is thick, viscous, and unlike anything else in the carrier oil family. The reason is ricinoleic acid a rare hydroxylated fatty acid that makes up roughly 90% of castor oils composition. Almost no other plant oil contains it in
The lash-and-brow oil — 90% ricinoleic acid, the highest concentration of any plant oil on earth. Cold-pressed from Ricinus communis seeds, nothing added, nothing removed.
Castor oil is thick, viscous, and unlike anything else in the carrier-oil family. The reason is ricinoleic acid — a rare hydroxylated fatty acid that makes up roughly 90% of castor oil’s composition. Almost no other plant oil contains it in meaningful amounts. That single compound is why castor oil has been traditionally used for eyelash conditioning, eyebrow thickness, and hair growth support for generations. It coats each strand, holds moisture against the follicle, and creates a barrier that may help reduce breakage over time.
Sampson’s castor oil is cold-pressed — mechanically extracted from the seeds of the Ricinus communis plant without hexane or chemical solvents. The result is a pale golden oil with a faint nutty scent, full fatty-acid profile intact, and no solvent residues. One ingredient. One bottle. The same oil that has been a staple in apothecary cabinets for centuries.
Who it’s for
Lashes & Brows
Traditionally used to condition eyelashes and eyebrows — may help support thickness and reduce brittleness over consistent use.
Hair Growth
Applied to the scalp as a pre-wash treatment. Ricinoleic acid may help support circulation to the follicle and reduce breakage.
Skin Care
Deep moisture for dry patches, cuticles, and rough elbows. Thick enough to stay put overnight — seals hydration where lighter oils evaporate.
Joint & Muscle
Used topically on sore joints and tired muscles. A traditional remedy — the oil’s thickness makes it ideal for slow-absorbing massage.
“We only put ingredients in our products that we would use on our own family. Every ingredient has a purpose. If it doesn’t need to be there, it isn’t.”
Volume
120 ml / 4 oz
Extraction
Cold-Pressed
Composition
100% Ricinus Communis
Key Compound
90% Ricinoleic Acid
Cruelty-Free
Yes
Vegan
Yes — plant-derived
Benefits
Eyelash & Eyebrow Conditioning
Lash & Brow Care
Castor oil for eyelashes and eyebrows is one of the oldest beauty rituals in the book. The oil’s high viscosity coats each hair from root to tip, and ricinoleic acid may help support the follicle environment. Consistent nightly application — typically 4–8 weeks — is how most people report visible results.
Hair Growth Support
Scalp Health
Applied directly to the scalp, castor oil for hair growth works as a pre-wash treatment. The ricinoleic acid may help support blood flow to the follicle, while the thick oil itself reduces mechanical breakage by coating the shaft. Best used warm — heat improves spreadability and absorption.
Deep Skin Moisturizer
Barrier Repair
Where lighter oils absorb and evaporate, castor oil sits on the surface and seals. That thickness is the point — it creates an occlusive barrier that locks hydration underneath. Particularly useful on dry cracked heels, rough elbows, and cuticles that peel in winter.
Anti-Inflammatory Properties
Ricinoleic Acid
Ricinoleic acid — the fatty acid unique to castor oil — has been studied for its anti-inflammatory properties. Traditionally used in topical applications for joint discomfort and muscle soreness. The mechanism is the same reason it works on irritated skin: it may help modulate the local inflammatory response.
Versatile Carrier Oil
DIY Base
Castor oil blends well with lighter carrier oils (jojoba, almond, argan) and essential oils. Use it as a base for DIY serums, hair masks, or body oil blends. Its thickness makes it a natural thickener — a few drops added to a thinner oil changes the texture entirely.
How to Use
Lashes
Dip a clean mascara wand or spoolie into the oil. Apply a thin coat along the upper lash line, working from root to tip. Do this before bed on clean, makeup-free lashes. Consistency matters more than quantity — a light coat nightly for 6–8 weeks is the traditional approach.
Brows
Place a small drop on your fingertip and massage into the brow in the direction of hair growth. Focus on sparse areas. Apply at night so the oil has hours to sit undisturbed. Some people see visible changes in 4–6 weeks of nightly use.
Hair & Scalp
Warm a tablespoon of oil between your palms and massage into the scalp in circular motions. Work through the lengths if your hair is dry or damaged. Leave for at least 30 minutes (or overnight under a shower cap for deeper conditioning), then shampoo out. Two washes may be needed — castor oil is thick.
Skin & Body
Apply directly to dry patches, cracked heels, or cuticles. For larger areas, mix 1:1 with a lighter carrier oil (almond or jojoba) to improve spreadability. Castor oil on its own is too viscous to spread easily over large skin areas.
Castor oil is thick by nature — that’s the ricinoleic acid at work. For easier application on hair and skin, mix it 1:1 with sweet almond oil or jojoba oil. You get the benefits of ricinoleic acid with the spreadability of a lighter carrier.
Ingredients
Ricinus Communis (Castor) Seed Oil
Single Ingredient
100% cold-pressed castor seed oil. The fatty acid profile is dominated by ricinoleic acid (~90%), with linoleic acid (~4%), oleic acid (~3%), stearic acid (~1%), and trace palmitic and dihydroxystearic acids making up the balance. No other plant oil has this composition — ricinoleic acid is essentially unique to the castor bean.
Full INCI
Ricinus Communis (Castor) Seed Oil.
* External use only. Avoid contact with eyes. If irritation occurs, discontinue use. Patch test recommended for sensitive skin.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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