If you’ve searched anything about joint pain or back pain recently, there’s a good chance castor oil has come up somewhere along the way. It’s one of those remedies that seems to be everywhere at the moment – packs, rubs, “detox” wraps – all promising to ease everything from arthritis to lower back pain.
Given how often the question comes up, I thought it was worth actually looking into what the evidence says, rather than just repeating what’s already floating around online.
Where does the claim come from?
Castor oil comes from the seeds of the castor bean plant, and its main active component is ricinoleic acid. Traditionally, it’s been used topically as a “castor oil pack” – the oil is applied to the skin, often with a cloth or bandage on top, sometimes with heat added.
The theory is that ricinoleic acid has anti-inflammatory properties, and that applying it to a painful joint or muscle might reduce local inflammation and ease discomfort.
Is there actual evidence for it?
This is where it gets more nuanced than most articles about castor oil let on.
There is some real science behind the mechanism. Ricinoleic acid has shown genuine anti-inflammatory activity in laboratory and animal studies – it’s not an invented idea.
But when it comes to actual clinical evidence in people, there’s very little to go on. As far as I could find, there’s essentially one relevant human trial: a small 2009 study comparing oral castor oil to the anti-inflammatory drug diclofenac sodium in patients with osteoarthritis, published in a specialist phytotherapy journal. It found the two performed comparably.
That might sound promising, but a single small trial, in a niche journal, that hasn’t been replicated, isn’t the same as an established, evidence-backed treatment. It’s telling that when a major review of osteoarthritis pain treatments assessed the available research, this study didn’t even make it into their analysis. Beyond that one trial, what’s out there is mostly wellness articles repeating the same claims, rather than new research adding to them.
So is it worth trying?
Applied topically, castor oil is low-risk – the main downside for most people is the occasional skin irritation, and it’s inexpensive and easy to get hold of. If it’s something you find comforting alongside everything else you’re doing, there’s little harm in that.
What I’d be cautious about is relying on it as your main strategy for dealing with joint or back pain, or assuming it’s dealing with the underlying issue. The evidence simply isn’t there to support that, and pain that’s persistent, worsening, or affecting how you move is worth having properly assessed rather than self-treated indefinitely.
What actually has good evidence behind it?
For joint and back pain, the treatments we see make a genuine difference are the ones backed by proper clinical research: appropriate exercise and movement (we wrote about this recently – see Should You Exercise When Your Joints Hurt?), hands-on osteopathic treatment to address how a joint or area is moving and loading, and, for some patients, adjunct technologies like K-Laser, which has a much stronger evidence base for reducing pain and inflammation than a topical oil.
The honest answer is that there’s rarely a single remedy that fixes joint or back pain on its own – it’s usually a combination of the right movement, the right hands-on treatment, and time.
If you’re dealing with joint or back pain and want an actual assessment rather than another home remedy to try, book an appointment with us and we’ll help you work out what’s actually going on.