The Best CBD Cream for Knee Pain: What the Science Actually Says

Knee pain is one of the most common musculoskeletal complaints in the United States — it affects roughly 25% of adults, and the figure has risen almost 65% over the past twenty years, accounting for nearly four million primary care visits a year. Whether it comes from osteoarthritis, a ligament injury, overuse or simply age, it can turn walking, stairs and exercise into something you plan around.

The standard approach is familiar: NSAIDs, corticosteroid injections, physical therapy and, when those stop working, surgery. Topical CBD has become a common addition to that picture, and this guide is about what the research behind it actually supports — including where it runs out.

We cover how CBD interacts with the endocannabinoid system, what the peer-reviewed studies have and have not found, and how our CBD + Terpenes formulations are built. The title promises what the science actually says, so that is what you are going to get, including the parts that are inconvenient for us.

Understanding Knee Pain: Why the Joint Is So Vulnerable

The knee is the largest and one of the most mechanically complex joints in the human body. It bears the full weight of the torso during standing, walking, running and jumping, absorbing forces of several times body weight during something as ordinary as walking down stairs. That makes it uniquely exposed to both acute injury and chronic degenerative disease.

Osteoarthritis is the leading cause of chronic knee pain. About 33 million US adults have osteoarthritis of some joint according to the CDC, and an estimated 14 million have symptomatic knee osteoarthritis specifically — more than half of them under 65. In knee OA the cartilage that cushions the joint gradually breaks down, leading to bone-on-bone friction, chronic inflammation, synovial thickening and progressive pain. Inflammatory cytokines — tumour necrosis factor-alpha (TNF-α), interleukin-1β and interleukin-6 — are understood to play a central role in both cartilage degradation and pain signalling in the osteoarthritic knee.

How CBD Works: The Endocannabinoid System and Joint Pain

The endocannabinoid system (ECS) is a cell-signalling network found throughout the body, including in joint tissues, synovial fluid and surrounding muscle and connective tissue. It is made up of endocannabinoids, cannabinoid receptors (CB1 and CB2), and the enzymes that build and break down those endocannabinoids.

CB1 receptors are concentrated in the central nervous system and are involved in modulating pain perception. CB2 receptors are found mainly on immune cells and in peripheral tissues, including the synovial membrane of joints, where they help regulate inflammatory responses. A 2009 review in CNS & Neurological Disorders – Drug Targets summarised evidence that cannabinoids suppress nociceptive — pain — processing through activation of both receptor subtypes. It is worth being clear about what kind of evidence that is: the review covers animal models of acute, inflammatory and neuropathic pain, and it is about cannabinoid pharmacology in general rather than about CBD, which is not a CB1 or CB2 agonist.

CBD itself does not bind those receptors the way THC does. A systematic review in the British Journal of Pharmacology describes it as “a very low-affinity CB1 ligand that can nevertheless affect CB1 receptor activity in vivo in an indirect manner.” One proposed route for that indirect effect is that CBD competes with anandamide for the fatty acid binding proteins that carry it into the cell: the researcher who originally characterised the FAAH enzyme writes that THC and CBD “inhibit the cellular uptake and catabolism of AEA by targeting FABPs”. You will still see CBD described as a straightforward FAAH inhibitor; that account is older and less well supported than it is usually presented. And the same systematic review offers the caveat that matters most in this whole section: in vitro mechanistic studies do not always predict in vivo pharmacology.

Separately, in cell culture and animal work, CBD has been reported to reduce “the activity of the NF-κB pathway and the levels of IL-1β and IL-6” — a result from mouse microglial cells in a dish. That is laboratory research. It has not been shown to happen in people using a topical CBD product, and we are not going to tell you a salve does it in your knee.

What the Research Says: Topical CBD and Knee Pain

Four studies get cited most often in this space. Here they are, with their designs attached.

In a 2016 preclinical study published in the European Journal of Pain, transdermal CBD gel applied to rats with adjuvant-induced arthritis reduced joint swelling, limb posture scores (a measure of spontaneous pain), immune cell infiltration and synovial membrane thickening, with no evident side effects. Two of the four doses tested were effective; the two lowest were not. It is a rat model, and it is worth reading as one.

In 2024, an open-label feasibility trial published in Scientific Reports had fifteen people with hand osteoarthritis apply a 4% w/w transdermal CBD gel three times daily for four weeks, and recorded reductions of roughly two points on a 0–10 pain scale from baseline. Read the design before the result. There was no placebo and no control group, so a change from baseline cannot be separated from placebo response, expectation, or the natural fluctuation of arthritis pain — and the authors say so themselves: “caution is therefore necessary in interpreting these results.” Four of the eleven authors are employees of the company that made and donated the gel. And it was hands, not knees. Hand joints sit close to the surface; a knee sits under considerably more tissue, which is exactly the variable that determines whether a topical reaches anything.

The strongest study on this list is also the smallest. A double-blind randomised crossover trial published in the Journal of Hand Surgery gave eighteen people with thumb basal joint arthritis purified CBD in shea butter for two weeks, and shea butter alone for two weeks. That control is the whole point: no menthol, no camphor, no capsaicin, so the only difference between the arms was the CBD — which is not true of most research on “CBD topicals,” where a cooling agent is doing work nobody accounts for. Participants reported improvements in pain and disability on the CBD arm, without adverse events. It is still eighteen people, and still a thumb.

And in a 2017 study published in Pain, CBD injected locally into the arthritic knees of rats reduced joint afferent nerve firing, improved weight bearing and withdrawal thresholds, and lowered acute joint inflammation measured as blood flow and leukocyte trafficking. Injected into the joint, in rats.

Notice what is not on that list: a published trial of a topical CBD product for knee osteoarthritis in humans. Everything above is an animal model, an injection rather than an application, or a small trial in a different joint. That is the honest state of the evidence, and anyone offering you certainty about a knee is ahead of it.

Why Topicals? The Case for Applying It Where It Hurts

Topical creams, salves and gels have one straightforward practical advantage for a specific joint: you put them where the problem is. Unlike oral CBD, which passes through the digestive system and liver before reaching circulation, a topical goes on the area you choose and stays largely with it.

CBD is lipophilic, and laboratory work using excised human skin in diffusion cells has shown that it can partition into and permeate skin, with the formulation vehicle strongly influencing how much is retained. What has not been shown is that it reaches a human knee joint in any meaningful amount.

In fact, a 2024 controlled study of five commercially available hemp-derived topicals found that the patch and balm products “did not produce detectable whole blood concentrations for any of the six analytes of interest at any study timepoint,” and that across the five products tested, “products did not produce discernable pharmacodynamic effects and were well-tolerated.”

We would rather you had that finding than not. It is the reason we describe our topicals as something you apply to a specific area and enjoy using, rather than as something that treats a joint.

Why We Formulate With Terpenes

We build our topicals around full-spectrum extract and a terpene blend. The honest reason is that terpenes are part of the plant and a large part of what makes a product worth reaching for — not that the science is settled. The idea that cannabinoids and terpenes work better in company than alone, the entourage effect, remains genuinely unsettled: a 2023 review in Biomedicines found existing preclinical and clinical studies “in general based on simplistic methodologies and show contradictory findings,” with the clinical data resting largely on anecdotal and real-world evidence.

Several terpenes come up repeatedly in the joint and inflammation literature. Here is what each has actually been studied for, and by what route:

• Limonene — the bright citrus note in many hemp cultivars. Its anti-inflammatory activity has been studied largely in animal models and cell culture, with limited human evidence from oral dietary supplementation. None of it involves application to skin.
• Humulene — the earthy, hoppy terpene also found in beer hops. Anti-inflammatory effects have been reported in mice and rats, given by mouth rather than applied topically.
• Beta-caryophyllene — peppery and spicy, and unusual among terpenes. Laboratory work published in PNAS identified it as a selective binder and functional agonist at the CB2 receptor, the subtype associated with immune tissue. That work is in vitro and in mice.
• Myrcene — the most abundant terpene in many hemp cultivars, musky and herbal. It has been investigated in a rat model of knee arthritis, where it was injected under the skin over the joint rather than applied to it — and the same study found that combining it with CBD produced no synergistic response.

None of that is a claim about what happens when you work a salve into your knee. It is what has been measured, in animals and in dishes, mostly by routes no one uses at home. We include terpenes because they are the more complete form of the plant and because they are what the product smells and feels like — and we would rather tell you that than dress it up.

Choosing a Salve for a Knee

A knee is a single joint over a small area, which is what a salve is for — thicker than an oil, and easier to keep in one place. Synergy Salve + is the strongest of the three at 2000 MG per 50 ML, which is the sensible starting point when you are covering one spot rather than a whole limb. Soothe Salve + is the gentlest at 1000 MG if you would rather begin lower. Both sit in the CBD + Terpenes line, with the same full-spectrum extract and the same fifty-plus terpene blend.

Working it in for two minutes after a walk or at the end of the day is the kind of habit that actually lasts, and it belongs alongside the rest of a sensible routine rather than in place of any of it — our active recovery guide puts that sequence in order.

One thing worth saying plainly: if your knee pain is new, severe, locking, giving way or swelling, see a doctor before you see a jar. That is not a disclaimer, it is the right order of operations.

We have written separately about CBD for joint aches and stiffness and about the terpenes most often discussed in relation to arthritis, both of which go deeper than we have room for here.

Every Entourus salve uses full-spectrum CBD from non-GMO hemp grown in Central Oregon. Our CBD + Terpenes line adds a proprietary blend of more than fifty botanically derived terpenes, including limonene and humulene. Both lines come in 1000, 1500 and 2000 MG per 50 ML jar.

Learn more about cannabis topicals on our FAQ.