Terpenes

The aromatic compounds that give hemp its smell and taste, preserved in full-spectrum extract and stripped out of isolate.

Hemp flower surrounded by lemon peel, peppercorns, pine, lavender and hops showing terpene aromas

Terpenes: The Aromatic Compounds Behind Hemp's Smell

Terpenes are the volatile compounds that give plants their aroma. They are why pine smells like pine, why a lemon peel smells bright, and why a bottle of genuine full-spectrum hemp extract smells earthy and peppery instead of smelling like nothing at all.

Hemp produces dozens of them. This page covers which ones are actually in hemp, what the research does and does not establish about them, and the safety distinction that matters most for cat owners.

What Are Terpenes?

Terpenes are small aromatic molecules that plants make as part of their own chemistry — deterring pests, attracting pollinators, protecting against heat and light. There are thousands across the plant kingdom, and you eat and smell them every day in herbs, spices, citrus and hops.

They are not cannabinoids. CBD and CBG are cannabinoids; terpenes are a separate class of compound that happens to sit alongside them in the plant.

The Terpenes Actually Found in Hemp

In CBD-dominant hemp, myrcene is generally the most abundant, followed by beta-caryophyllene, limonene, alpha- and beta-pinene, linalool and humulene.

Each has a signature you may already know: myrcene is earthy and musky and also occurs in hops, mango and thyme. Beta-caryophyllene is peppery — it is the compound in black pepper and cloves. Limonene is citrus, from the rind. Pinene is pine and rosemary. Linalool is floral, the one in lavender and coriander. Humulene is hoppy and woody.

Terpenes and the Entourage Effect

The entourage effect is the idea that hemp's compounds do more together than separately. Terpenes are usually named as a big part of that, and here we will be straight with you about where the evidence sits.

A 2019 study in Cannabis and Cannabinoid Research tested the six most common cannabis terpenes and found that none of them directly activated the CB1 or CB2 receptors, and none changed how THC behaved at those receptors. Whatever the entourage effect is, it does not appear to work that way.

One terpene is a genuine exception. Research published in PNAS showed that beta-caryophyllene selectively binds the CB2 receptor, making it a dietary compound with real cannabinoid pharmacology — which is interesting, and is also true of the black pepper in your kitchen.

Later work found some terpenes produce cannabinoid-like effects in mice, but only at concentrations far above what occurs naturally in a plant extract. The honest summary: plausible, mechanistically interesting, not established at real-world amounts.

Why Terpenes Signal Extract Quality

Terpenes are the most fragile part of the extract. They are volatile, so heat, vacuum and aggressive processing drive them off first. An extract that still smells strongly of the plant is an extract that was handled gently.

This is the practical reason a full-spectrum oil smells and tastes like something and a CBD isolate product does not. If your bottle smells grassy and peppery, that is the plant, and it is a good sign.

Terpenes, Essential Oils and Cats

Terpenes get confused with essential oils, and the difference matters. An essential oil is a concentrated distillate that is largely terpene by volume. A full-spectrum hemp extract contains terpenes at the trace levels native to the plant, diluted further in a carrier oil. Concentration is the whole distinction.

Cats deserve a specific note. Cats are deficient in the enzyme glucuronyl transferase, which makes them more sensitive than dogs to phenols and phenolic compounds — the reason concentrated essential oils such as tea tree, cinnamon, pennyroyal and wintergreen are hazardous to them. The Merck Veterinary Manual covers this in detail.

That is a caution about concentrated oils, not a verdict on trace terpenes in a diluted hemp extract. The sensible course for a cat is a product formulated and portioned for cats — see CBD Hemp for Cats — and a conversation with your veterinarian. Never dose a cat with an essential oil.

How HempMy Pet Preserves the Terpene Profile

We breed our own hemp genetics and grow them on our farm in Longmont, Colorado using organic growing practices, then formulate in-house rather than buying bulk distillate. Keeping the plant's native terpene profile intact is one of the reasons we make full-spectrum extract instead of stripping it down. Browse CBD Hemp for Dogs or CBD Hemp for Horses.

Frequently Asked Questions

Are terpenes like CBD? No. Both come from the same plant, but terpenes are aromatic compounds and CBD is a cannabinoid. They are different classes of molecule that occur together.

Are terpenes safe for dogs? At the trace levels naturally present in a full-spectrum hemp extract they are part of the plant your dog is already getting. Concentrated essential oils are an entirely different exposure and should not be given to pets.

Are terpenes safe for cats? Cats process phenolic compounds poorly, so concentrated essential oils are genuinely hazardous to them. Use a hemp product formulated and portioned for cats, and check with your veterinarian first.

Do terpenes get you or your pet high? No. Terpenes are not intoxicating. Only THC is, and legal hemp contains less than 0.3% of it.

What terpenes are in hemp? Most commonly myrcene, beta-caryophyllene, limonene, alpha- and beta-pinene, linalool and humulene.

Why does my dog's hemp oil smell so strong? That aroma is the terpene profile, and it means the extract was not stripped or over-processed. A hemp oil that smells like nothing is usually an isolate.

Should I add terpenes to my dog's food? No. Buying isolated terpene concentrates and adding them is exactly the concentration problem described above. The terpenes in a full-spectrum extract are already there in plant-level amounts.

What terpenes are associated with anxiety? Linalool and limonene come up most often in calm-related research, and beta-caryophyllene is the one with genuine cannabinoid-receptor activity. Nearly all of that work is in humans and rodents, not dogs, and none of it establishes that a terpene treats anxiety in pets. Treat the aromatherapy claims you see online with real scepticism.

Can terpenes cause anxiety in dogs? There is no evidence that the trace terpenes in a full-spectrum hemp extract cause anxiety. Concentrated essential oils are a different matter — strong scents can genuinely distress a dog, and some are toxic to cats.

Can dogs be allergic to terpenes? Individual sensitivities are possible with any botanical. Introduce anything new gradually and stop if you see a reaction.

Further reading: Cornell's Riney Canine Health Center on CBD from hemp.