CBN
Formed as THC ages
Cannabinoid
What is CBN?
CBN (cannabinol) is a minor cannabinoid that forms as THC ages and oxidizes. Over time — or with exposure to heat, light, and air — THC slowly degrades into CBN. This is why fresh flower tests low in CBN, while older or poorly stored flower carries noticeably more of it.
CBN is only mildly psychoactive. It binds weakly to the CB1 receptor — roughly a tenth of THC's potency — so at the levels typically found in flower, it's essentially non-intoxicating.
How CBN forms
Two things turn THC into CBN: time and heat. Oxidation gradually converts THC to CBN as cannabis ages, which is why aged flower tends to make people drowsier. Combustion also creates some CBN when you smoke — a small portion of the THC in the flower converts to CBN in the flame.
As a rule of thumb, the more THC has been exposed to air and light, the more CBN you'll find. Properly stored cannabis keeps CBN levels low; leftover, long-sitting flower is where CBN builds up.
Sleep and relaxation
CBN is most famous as a sleep aid, and it does lean heavily toward relaxing, sedating effects. The honest caveat is that the research is thinner than the marketing. Much of the 'CBN knocks you out' reputation comes from high-dose studies and anecdotal reports, while some human trials have shown little difference from placebo for sleep quality.
That said, in combination with the rest of a strain's profile — especially alongside sedating terpenes like myrcene — CBN is commonly experienced as a calming, sleepy compound, and it's a reasonable choice for winding down in the evening.
Other potential benefits
Early research points to a handful of other uses: appetite stimulation, anti-inflammatory and antibacterial activity, and support for bone health by encouraging the activity of bone-building cells. Studies have also explored CBN for pressure in the eyes (glaucoma) and as an analgesic.
Most of this evidence is still in its early stages, but CBN's low-intoxicating profile makes it an interesting compound for therapeutic use — and a gentle option for people who don't want the high of THC.
CBN in the entourage effect
Because CBN is gentle and relaxing, it's a useful counterweight to THC. As covered in the THC section, pairing CBN with THC can help take the edge off and lower anxiety — useful for people who find THC alone too intense.
Combined with CBG it can boost mood while keeping things calm, and its sedating lean makes it a natural fit for evening or nighttime use alongside relaxing terpenes.
Conditions that cite this compound
These condition guides point here — they cover the same compound from the patient side.