BENEFITS OF CASTOR OIL: your complete guide (+ sources)
- Jul 6
- 6 min read
Castor oil has long been one of those under-appreciated staples tucked into the back of the medicine cabinet – a relic of old-school remedies and whispered family traditions. But haven't you noticed that over the last few years it's made a comeback?
People across the globe are once again turning to castor oil not only for its skin and hair benefits, but also for a wide range of home remedies and wellness rituals. And while science is still catching up to many of these anecdotal claims, the sheer volume of testimonials offers some compelling food for thought.
First, let’s talk about what the science does tell us. Castor oil, derived from the seeds of the Ricinus communis plant, is rich in ricinoleic acid – a fatty acid known for its anti-inflammatory and antimicrobial properties. It’s been shown to be effective as a moisturizing agent, making it useful for dry skin, and its emollient nature means it can help form a protective barrier on the skin to retain hydration. There’s also limited research suggesting it may support wound healing and even boost lymphocyte function when used alongside heated packs, though this hasn’t been openly shared within cancer-specific contexts.
What is ricinoleic acid?
Ricinoleic acid is a unique fatty acid* that makes up about 85–90% of castor oil. It’s a monounsaturated omega-9 fatty acid, but what sets it apart is the presence of a hydroxyl group (-OH) on the 12th carbon of its chain – something not found in other fatty acids in terms of abundance in a natural oil. This little structural difference gives it special abilities that help it interact with cells, enzymes, and microbes in the body in a more targeted way.
*Fatty acids are the building blocks of oils and fats. They're what make carrier oils feel rich, moisturising, and soothing on the skin. Each type of oil has its own unique mix of fatty acids, which is why some absorb quickly, some are heavier, and others are great for calming irritation or supporting the skin barrier.
Anti-inflammatory action
Inflammation in the body is typically caused by compounds like prostaglandins, which signal pain, redness, swelling, and heat. Ricinoleic acid has been shown to inhibit the enzyme cyclooxygenase-2 (COX-2), which is involved in making these prostaglandins.
Think of COX-2 as the "pain switch" – when ricinoleic acid steps in, it blocks this switch from flipping all the way on. This results in reduced swelling, less redness, and diminished discomfort. Some studies even suggest its anti-inflammatory effect is comparable to mild over-the-counter pain relievers.
Antimicrobial action
Ricinoleic acid also disrupts the membranes of bacteria and fungi. It integrates into their lipid bilayers (cell walls) and makes them more permeable – kind of like poking holes in a balloon. This causes the microorganisms to lose essential ions and nutrients, leading to their death.
In other words, it makes it difficult for microbes to survive or reproduce, which is why castor oil can help reduce skin infections, acne, and even fungal issues like athlete’s foot.
Where things get even more interesting is in the personal accounts shared from users around the world. While these stories aren’t peer-reviewed, they are undeniably consistent. Many people claim castor oil has helped lighten dark spots, reduce the appearance of sun damage, and make skin look visibly younger. Some say it works wonders on inflammation, pain (especially when combined with cayenne), and joint issues like arthritis.
Others use castor oil packs – typically a piece of cotton flannel soaked in castor oil and warmed with a heat source – over areas like the liver or abdomen. Though these practices lack robust clinical validation, users report outcomes such as normalized liver enzyme levels, reduced bloating, and relief from digestive issues like IBS-C. A few even believe it helped with gallstones and fatty liver – and we believe it deserves mention and further research.
In the world of haircare, the oil has long been used to promote fuller eyebrows and thicker eyelashes. Some swear by it for stimulating scalp circulation and encouraging hair growth. On the feet and belly button = It’s used to nourish dry skin and support overall relaxation. Some apply it in the eyes and to the eyelids to address eye conditions such as cataracts and floaters, and there are loads of stories from people who have experienced improved vision over time with regular application!
Here are just a few of the testimonials we’ve come across:
"It helped lighten my dark spots and made my face look younger."
"Helped me get my fatty liver numbers in the normal range."
"Relaxes me at night and helps me fall asleep."
"Breaks down cysts, fibrous tissue, even moles."
"Great for arthritis in my hands and knees. I rub it on my joints."
"I use it on my eyelids for cataracts. It’s even helped with floaters."
"Works for hemorrhoids. Helped a lot."
"Helped heal cuts faster and improved my IBS-C symptoms."
Despite the lack of large-scale scientific studies on many of these applications, the overwhelming anecdotal evidence invites us to ask deeper questions.
Why are so many people seeing such broad benefits from a single oil?
Could it be that castor oil’s unique chemistry enables it to penetrate deeper than other oils, as some users suggest?
Does the heat from a pack aid in its absorption, allowing it to influence tissue health more directly?
Castor oil: A household must-have
Beyond the personal care space, castor oil has also found its way into household use. It can quiet squeaky door hinges, loosen stuck zippers, and even help prevent rust on metal tools. Some use it to condition leather goods, while others rub a bit into wooden cutting boards or furniture to add shine and moisture. It’s been used to lubricate sewing machines and protect gardening tools from corrosion. These small, practical applications highlight the versatility of castor oil as a multifunctional household staple.
Traditionally, products like mineral oil and WD-40 have been used for many of these same tasks. The major advantage of castor oil is that it’s plant-based, non-toxic and readily biodegradable, making it an eco-conscious alternative that supports both the home and the planet – and we're all for that!
Of course, more research is needed to move from curiosity to confirmation. But when an ingredient has been used consistently for generations, across cultures and continents, it’s worth pausing to explore its potential.
Castor oil may not be a miracle everything-cure, but it certainly seems to be a natural powerhouse worthy of further investigation. Whether you’re interested in improving your skin, supporting your joints, or simply curious about traditional wellness methods, this humble oil might be worth a second look.
As always, speak to a healthcare practitioner before using castor oil for medical concerns, especially if you’re considering internal use or applying it near sensitive areas like the eyes. But if nothing else, castor oil offers a fascinating blend of old wisdom and new possibilities – a gentle reminder that sometimes the simplest remedies deserve the loudest praise.
Best castor oil
There are lots of adulterated forms of castor oil (meaning, a lot of additives may have been included in its production), so naturally we recommend the best: Organic, cold-pressed, hexane-free castor oil (hexane is a petroleum-derived, commonly used inexpensive solvent).
Cold-pressed oils are best as the process retains more of the seed's powerful nutrients and antioxidants. Hexane-free castor oil is produced using mechanical pressing methods, ensuring a pure and natural oil without the residual solvent. If in doubt, ask your supplier for the Safety Data Sheet (SDS) and Certificate of Analysis (CoA) to have a closer look at the manufacturing process. If your supplier cannot provide it, find a different, more reliable supplier.
We also suggest that castor oil be purchased in an amber-coloured, glass bottle, as otherwise it may pull plastics in to its formula.
SOURCES & RESEARCH
These sources provide a well-rounded understanding of castor oil's composition and its diverse applications across various fields. If you need more detailed information on any specific aspect, feel free to ask!
This safety assessment provides detailed information on the chemical composition of castor oil and its safety profile in cosmetic formulations.
An overview of castor oil's traditional and medicinal uses, including its application in treating various ailments.
This study explores the antimicrobial and anti-inflammatory properties of castor oil, particularly in ocular applications.
This article discusses the role of castor oil in cosmetic products, emphasizing its moisturizing and skin-softening properties.
This preliminary study investigates the potential anxiolytic effects of castor oil and its primary component, ricinoleic acid, in animal models.
This research examines the lubricating properties of castor oil, highlighting its potential as an eco-friendly alternative to synthetic lubricants.
An overview of castor oil's traditional and medicinal uses, including its application in treating various ailments.
This study explores the antimicrobial and anti-inflammatory properties of castor oil, particularly in ocular applications.