Meet Your Skin’s Endocannabinoid Receptors: CB1 + CB2

For years, the endocannabinoid system was discussed almost exclusively in conversations about cannabis. That association makes sense historically, but it has also created one of the biggest misunderstandings surrounding the system itself. The endocannabinoid system, or ECS, is not something cannabis gives us. It is a signaling system already present throughout the human body, and our skin is part of it.

Human skin contains the molecular machinery necessary for endocannabinoid signaling. Researchers have identified endocannabinoids, the enzymes involved in their production and breakdown, and cannabinoid receptors within the skin. Among those receptors are the two considered the classical cannabinoid receptors: CB1 and CB2.

They have been identified in structures including epidermal keratinocytes, sensory nerve fibers, hair follicles, sebaceous glands, sweat glands and cells associated with immune activity. That makes the ECS particularly interesting when we begin looking at skin as something more sophisticated than a surface onto which we apply products.

Skin is constantly receiving information, interpreting its environment and responding to change. The endocannabinoid system appears to be one of the signaling networks involved in that conversation.

The Skin Has Its Own Endocannabinoid System

At its most basic, the endocannabinoid system consists of signaling molecules called endocannabinoids, receptors capable of receiving those signals, and enzymes responsible for creating and breaking down those signaling molecules.

Two of the best-known endocannabinoids are anandamide (AEA) and 2-arachidonoylglycerol (2-AG). Unlike a cosmetic ingredient that has to be introduced from outside the body, these are molecules our bodies naturally produce.

What makes the skin particularly fascinating is that it doesn’t simply contain cannabinoid receptors. Research indicates that skin cells can produce endocannabinoids locally and contain the enzymes needed to metabolize them. This has led researchers to describe a functional cutaneous endocannabinoid system—essentially, an endocannabinoid signaling environment operating within the skin itself.

One of the concepts that comes up repeatedly in this research is homeostasis. Skin is constantly adapting to changing conditions while trying to maintain the balance necessary for normal function. Research suggests the cutaneous ECS participates in the regulation of processes related to cell growth and differentiation, barrier function, sebaceous activity, immune signaling, hair-follicle biology and sensory processes.

That does not mean the ECS independently controls all of those things. Biology rarely works through one system acting alone. Instead, the ECS appears to participate in a much larger network of signals, receptors and pathways that influence one another.

And that brings us to CB1 and CB2.

CB1: More Than “The THC Receptor”

CB1, or cannabinoid receptor type 1, is probably best known because of its abundance in the nervous system and its interaction with THC. That reputation can make it easy to think of CB1 primarily as a brain receptor, but CB1 is also expressed in peripheral tissues—including the skin.

Researchers examining human skin have identified CB1 in epidermal keratinocytes, nerve fibers, hair follicles, sebaceous glands and sweat-gland-associated structures. Its presence in these different locations has prompted research into the ways CB1-associated signaling may participate in normal skin physiology, including epidermal activity, sensory signaling and hair-follicle biology.

The important word here is signaling. A receptor is part of a communication process. A molecule capable of interacting with CB1 may bind to or otherwise influence that receptor, but what happens afterward depends on an enormous amount of biological context: the molecule involved, its concentration, the type of cell, the state of that cell, other signaling pathways active at the same time and many other variables.

This is why receptor science cannot responsibly be reduced to “this ingredient activates this receptor, therefore this result happens.” The biology is considerably more nuanced.

What CB1 does show us, however, is that skin possesses receptor systems capable of recognizing and responding to chemical signals. That is an important distinction when thinking about how topical products interact with living skin.

CB2: Another Receptor, Another Part of the Conversation

CB2, or cannabinoid receptor type 2, has historically been associated more strongly with immune cells and peripheral tissues. Researchers have also identified CB2 throughout human skin, including in keratinocytes, mast cells, macrophages, sebaceous structures and hair follicles.

Because of where CB2 is expressed, much of the research surrounding it has examined its relationship with immune signaling and inflammatory processes. Researchers have also investigated cannabinoid signaling in sebocytes, the specialized cells within sebaceous glands responsible for producing sebum.

Again, the presence of CB2 does not mean that applying an ingredient associated with cannabinoid signaling automatically creates a specific cosmetic or therapeutic outcome. Identifying a receptor tells us that the biological machinery exists. Understanding precisely how that machinery behaves under different circumstances is a much larger scientific question.

That distinction matters enormously in skincare, where complex biology is often compressed into very simple marketing claims.

For us, the interesting part isn’t finding a receptor and attaching a miracle claim to it. The interesting part is recognizing that the receptor is there at all—and asking what that teaches us about the way skin communicates.

CB1 and CB2 Are Related, But They Aren’t Interchangeable

Because CB1 and CB2 belong to the same cannabinoid receptor family, it is tempting to think of them as two versions of essentially the same thing. Their biology is more complicated than that.

Their expression varies across tissues and cell types, and studies examining human skin have found different patterns of CB1 and CB2 expression within structures such as the epidermis, hair follicles and sebaceous glands. Researchers continue to investigate what those differences mean and how cannabinoid signaling interacts with the many other systems operating in skin.

That complexity is actually one of the most compelling parts of receptor biology. Skin does not rely on a single receptor system. It contains a network of receptors and signaling pathways that can communicate with, modify and influence one another.

CB1 and CB2 are two pieces of that network, but they are not the entire network.

The Endocannabinoid System Is Not the Same Thing as CBD

This is probably the most important misconception to clear up.

The endocannabinoid system is not a CBD system, and cannabinoid receptors do not exist because cannabis exists. Humans and other animals produce their own cannabinoid-like signaling molecules—our endocannabinoids—and those molecules participate in normal physiology regardless of whether someone has ever used a cannabis-derived product.

CBD is particularly interesting because its pharmacology is also much more complicated than the familiar cannabinoid terminology suggests. CBD does not simply behave as a straightforward CB1 or CB2 agonist. Researchers have studied its activity across a broader collection of molecular targets, including members of the transient receptor potential, or TRP, channel family, as well as other signaling pathways.

This is where the receptor-driven conversation becomes much larger than cannabinoids.

Our skin contains cannabinoid receptors, but it also contains TRP channels, opioid receptors, nuclear receptors and many other molecular systems involved in cellular communication and sensory biology. These systems do not necessarily operate independently. Biology is interconnected, and researchers continue to investigate the relationships among them.

So when we use the term receptor-driven skincare at Potency No. 710, we are not using it as another name for cannabinoid skincare. The endocannabinoid system is an important part of the conversation, but it is one part.

Why This Matters to the Way We Think About Skincare

Most skincare conversations begin with what we can see. We see dryness, texture, oiliness, redness or visible signs of aging, and then look for ingredients marketed toward that concern.

There is nothing inherently wrong with that approach, but receptor biology gives us another way to think.

Instead of beginning only with what we want skin to look like, we can also ask how skin functions as a responsive biological organ. What signaling systems are present? What receptors do skin cells express? What molecules interact with those systems? How do those pathways communicate with one another? And what does the available evidence actually allow us to say about those interactions?

Those questions are much harder to fit onto the front of a bottle, but they are far more interesting.

They also require restraint. The discovery that an ingredient interacts with a particular receptor is not proof that putting that ingredient into a cosmetic will produce a particular result in a person. Receptor activity observed in a laboratory, activity in isolated cells, animal research and demonstrated clinical outcomes in human skin are very different levels of evidence.

Receptor-driven should never mean receptor-hype.

For us, it means allowing what we know about skin biology to inform the way we think about ingredients and formulation, while remaining equally interested in what science has not established yet.

A Different Way of Looking at Skin

The more closely researchers study skin, the less it resembles the passive outer covering we were once taught to imagine. Skin is sensory, immunologically active and metabolically complex. It produces signaling molecules, expresses receptors capable of recognizing them and continually responds to changes occurring both outside and inside the body.

CB1 and CB2 are part of that story.

Understanding these receptors doesn’t give us a simple formula for making skincare. It gives us a better framework for asking questions about skincare.

We can still ask what is in the bottle. We should ask what is in the bottle.

But receptor biology encourages us to ask another question alongside it:

What is the skin biologically equipped to hear?

That question is at the heart of what we mean when we talk about receptor-driven skincare.