Topical CBD for Thumb Arthritis

Hands come up all the time when people talk to me about pain.

For many people, especially as they get older, hand pain doesn't start with one big injury. It shows up in ordinary moments. A jar suddenly takes two tries to open. Turning a key hurts at the base of the thumb. Buttons get annoying. Holding a coffee mug by the handle feels different than it used to.

Each of those seems small until they start happening all day long. That's what makes hand arthritis so frustrating. We ask a huge amount of our hands, and even mild pain can get in the way of dozens of everyday tasks.

People reasonably ask whether a CBD topical might help. Until recently, the honest answer was that the biology looked interesting, the personal stories were plentiful, and the human evidence was thin. A 2022 study in The Journal of Hand Surgery gave us something better to work with.

It was still a small study, and it didn't prove that CBD treats arthritis. But the researchers asked a narrow question, designed the experiment carefully, and got a result worth a close look. The details matter, because this is exactly the kind of study that gets exaggerated once it leaves the medical journal. So let's look at what the researchers did, what they found, and what it can reasonably tell us about putting CBD on a painful hand.

Why the base of the thumb matters

The study looked specifically at thumb basal joint arthritis, also called CMC osteoarthritis (short for first carpometacarpal). This is the joint where your thumb meets your wrist. It takes a lot of force every time you pinch, grip, twist or open something, so when it wears down, ordinary hand movements can hurt surprisingly often.

That narrow focus is one of the study's strengths. The researchers didn't enroll people who simply said their hands hurt. They studied people with arthritis in one specific joint and measured outcomes tied to that problem. That makes for a much cleaner experiment.

It also sets a clear limit on the conclusions. A result in thumb arthritis is evidence about thumb arthritis. It doesn't automatically carry over to shoulder pain, knee pain, nerve pain, back pain or any other reason someone reaches for a topical. That sounds obvious, but it's one of the most common ways a small study turns into a big marketing claim.

The researchers started with safety

Before testing whether CBD helped with pain, the researchers ran a small safety check. Ten healthy volunteers applied one milliliter of a CBD preparation (6.2 mg of CBD per milliliter, mixed into shea butter) twice a day for seven days. The team watched for skin reactions and other side effects, found none, and got the go-ahead to run the main trial.

That first step matters because putting CBD on your skin and swallowing it are different things. Swallowed CBD passes through your digestive system and liver before it reaches your bloodstream. A topical goes directly on the painful area, and how much gets through the skin becomes part of the question. The amount used, the base it's mixed into, the condition of your skin, where it's applied and the other ingredients can all change what happens next.

So when we talk about research on topical CBD, we shouldn't casually borrow evidence from studies of CBD taken by mouth. They're different routes, and they deserve to be treated that way.

How the main trial worked

The main trial included 18 people with painful thumb arthritis. Each person was randomly assigned to start with either the CBD balm or a control balm. They used it twice a day for two weeks, stopped for a one-week break (called a washout), and then switched to the other balm for two more weeks.

Three design choices make this small study stronger than it looks.

The control was the same balm without CBD. The CBD balm was 6.2 mg/mL of CBD in shea butter. The control was plain shea butter. That's an important detail. Rubbing any balm on a sore joint involves touching it, massaging it and moisturizing the skin, and all of that can feel good on its own. Comparing CBD-plus-shea-butter to shea butter alone isolates the one thing that differed: the CBD.

Everyone tried both. This is called a crossover design. Instead of comparing one group on CBD with a different group on placebo, each person served as their own comparison. That helps cut down the natural person-to-person differences that make small trials hard to read.

Nobody knew which balm was which. The trial was blinded: neither the participants nor the people measuring results knew which treatment was in use at the time.

With only 18 people, those choices matter a lot. They can't make a study bigger. They can make a small study better.

What improved, and what didn't

The clearest results came from the participants themselves. While using the CBD balm, people reported less pain and less disability than while using the plain balm. The researchers measured this with a standard 0-to-10 pain scale and two established questionnaires about hand and arm function: the DASH (Disabilities of the Arm, Shoulder and Hand) and the SANE (Single Assessment Numeric Evaluation).

The researchers also measured the hand physically: range of motion, grip strength and pinch strength. Those came out about the same with either balm.

The improvement in how people felt is meaningful. Pain is, by definition, something reported by the person who has it. If someone can turn a key, hold a mug, cook dinner or get dressed with less discomfort, that matters even if an instrument can't detect a matching change in the joint.

I don't see the strength results as a contradiction. Pain, strength, function and joint structure are related, but they aren't the same thing. Someone can hurt less without suddenly squeezing harder. What this study suggests is that the most noticeable effect was in how people experienced their arthritis and how much it got in their way, not in the physical measurements taken after two weeks.

There are several possible explanations. CBD may mainly affect how pain is perceived. Two weeks may be too short for strength or motion to change. The strength tests may not pick up the kind of difference people were feeling. Or, in a study this small, some of the benefit may be less solid than it looks and could shrink in a larger group.

This study can't tell us which explanation is right. That's what the next study is for.

How it compares with other hand arthritis studies

Two other studies help put this one in context, and they point in different directions.

A newer study adds a clue

In a 2024 study, people with painful hand osteoarthritis applied a 4% CBD gel three times a day for four weeks. Eighteen people started and 15 finished. During treatment, their pain dropped by about 2 points on a 0-to-10 scale. Grip strength went up, and they also reported less stiffness, fatigue and anxiety. When they stopped using the gel, pain and grip strength drifted back toward where they started. Small amounts of CBD showed up in their urine, so at least some of it was absorbed into the body.

That sounds promising, but there's a big catch: there was no placebo group. Everyone knew they were using CBD. That makes the study useful for showing the treatment can be tested and for generating ideas, but it can't show that CBD itself caused the improvements. The authors said the same thing: the benefit still needs to be proven in a placebo-controlled trial.

Put the two topical studies together and you get something interesting but not definitive. The controlled 2022 trial found less pain and disability but no change in strength. The 2024 study found less pain and better grip, but without a comparison group to tell us how much was due to CBD. That's not a finished body of evidence. It's the start of one.

A larger oral study found no benefit

This is where the way you use CBD becomes especially important. A much larger trial studied people with hand osteoarthritis or psoriatic arthritis. They took synthetic CBD capsules (20 to 30 mg a day) or a placebo for 12 weeks. Pain didn't improve any more with CBD than with placebo. There was also no benefit for sleep, anxiety, depression or pain catastrophizing (the tendency to expect the worst from pain).

That doesn't cancel out the topical study. It does remind us not to talk about "CBD for arthritis" as if every product and every way of taking it were the same. A capsule isn't a balm. A gel designed to soak through the skin isn't necessarily the same as either. Strength, dose, how often you use it, what it's mixed into, how well it gets through the skin and where the problem is all matter.

So "Does CBD work for arthritis?" isn't the most useful question. A better one is: under what conditions, in what form, at what dose and applied how might CBD affect pain? We don't have a complete answer yet.

The FDA did not approve CBD for arthritis

The original paper mentions that the study went ahead after FDA and institutional review. That line is easy to misread.

The FDA's involvement was about the research itself. After the safety phase, the researchers were allowed to move on to the main trial. That's not FDA approval of CBD topicals as an arthritis treatment. The FDA didn't approve any product category based on this trial, and the study certainly didn't approve any Blue Sky CBD product. This was a clinical experiment, and that difference matters.

What the study actually used

The researchers used a deliberately simple preparation: pure CBD isolate in shea butter. No CBG. No CBN. No blend of cannabinoids.

That simplicity makes the result easier to interpret. If people did better on CBD than on the same shea butter without it, the CBD was the main thing being tested.

It also matters when we try to apply the study to products on the shelf. If a topical contains CBD plus CBG, CBN, THC or another cannabinoid, we can't point to this study and assume the same result applies to that whole formula. That doesn't mean those combinations don't work. It means they aren't what this study tested.

Why Deep Relief is the Blue Sky topical I'd point to

Here I can be more specific. Deep Relief is a 2 oz topical in which CBD is the only cannabinoid. It doesn't contain CBG or CBN. That makes it the closest match among our topicals to what this study tested.

Our Max Relief formulas deliberately combine CBD with CBG, and our Sleep formulas use a different cannabinoid approach. Those products are built for different goals, and this study tells us nothing about whether adding another cannabinoid improves or changes the result. So if you read this research and ask which Blue Sky topical most closely follows what the researchers tested, my answer is Deep Relief.

That does not mean Deep Relief is the study product. It isn't. Nobody has run this trial with Deep Relief, and I don't want to blur that line. The researchers tested their own mix of CBD isolate in shea butter. Deep Relief is a separate commercial formula. The connection is narrower: both use CBD as the only cannabinoid. That makes Deep Relief the right Blue Sky product to discuss alongside this research, without pretending the two are the same.

What about strength?

The study preparation contained about 6.2 mg of CBD per milliliter. Deep Relief contains 1,000 mg of CBD in a 2 oz tube.

It's tempting to put those numbers side by side and declare one product two or three times stronger. I don't think that's responsible. The researchers measured concentration per milliliter and controlled exactly how much was applied. A commercial balm is labeled by total product size and total CBD. Comparing them precisely would require assumptions about the finished product's volume, its density and exactly how much you apply each time. That would suggest more certainty than we have.

More importantly, even if one preparation had more CBD per application, that wouldn't mean it works better. More CBD doesn't automatically mean more effect; that has to be shown. So the meaningful comparison is the type of formula, not a made-up strength multiple. The study used CBD alone. Deep Relief uses CBD alone. That's as far as I think the comparison should go.

What I'd actually do with this information

If your hand hurts now and then after gardening, working out, using tools or a long day at the keyboard, a CBD balm is a reasonable wellness product to try. I'd judge it by what you can do, not by looking for a dramatic sensation when you put it on. Ask yourself:

Those questions are surprisingly close to what the researchers were measuring with their questionnaires, and the study suggests that's where a real change is most likely to show up first.

I'd also be consistent. People in the trial didn't use the balm once when their hand happened to hurt. They used it twice a day for two weeks. That doesn't mean you need to copy the research protocol with a store-bought balm; different products have different directions. It does mean one or two scattered applications tell you very little. Give yourself enough time to notice a pattern.

And when you judge that pattern, pay attention to your life, not just your pain score. The jar matters. The key matters. The button matters. Those are the reasons we care about the hand in the first place.

When a balm isn't enough

If the problem really is arthritis, there's a more important point: joint pain that doesn't go away deserves a diagnosis. Talk to a qualified clinician if your hands are:

• Often swollen
• Very stiff in the morning
• Changing shape
• Getting weaker
• Getting in the way of everyday activities
• Getting steadily worse

Hand pain has several causes, and they aren't interchangeable. Osteoarthritis is different from rheumatoid arthritis. Tendon problems are different from joint disease. A pinched nerve can cause symptoms that people first describe as simply "hand pain." Getting the diagnosis right matters because some conditions need treatment to prevent further damage.

A balm shouldn't become a reason to put off that visit. It also shouldn't become a reason to stop medication, quit hand therapy, stop wearing a prescribed splint, or otherwise replace a treatment plan that's working. The evidence for topical CBD simply isn't strong enough to justify that.

So, how good is the evidence?

Better than it used to be. Not as good as I'd like it to be. That's probably the most accurate summary.

Since then, a 2024 study added another encouraging sign in hand osteoarthritis, but without a placebo group it can't confirm that CBD was responsible. And a considerably larger study of CBD taken by mouth for hand arthritis found no pain benefit over placebo.

So the evidence doesn't let us say CBD "treats arthritis." It gives us something narrower and, in my view, more useful: controlled human evidence that topical CBD may ease how thumb arthritis pain and disability feel, and enough other research to justify larger, longer, better-controlled trials. That's a real finding. It's also a limited one. Both parts deserve to stay together.

Where this leaves me

I've spent enough years in natural and integrative medicine to be wary of two opposite habits. The first is dismissing something just because the research is young. The second is turning one encouraging trial into certainty. Neither one helps patients.

When a small but carefully designed trial produces a useful signal, I pay attention. I look at how it was done. I look at what changed. I look just as carefully at what didn't. Then I wait for the next study.

That's where topical CBD for hand pain sits today. The evidence has moved beyond personal stories. It hasn't reached the point where anyone can make sweeping claims.

If you use a CBD topical and find your hand bothers you less and gets in your way less, that's a meaningful result. If it does nothing for you, the science isn't mature enough for anyone to insist it should. And if the pain keeps coming back, keeps getting worse or is changing how your hand works, the most important next step isn't a stronger balm. It's finding out why your hand hurts in the first place.

Eric Dorninger, ND
Director of Research & Development, Blue Sky CBD