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JWH-210 is a synthetic cannabinoid of the naphthoylindole class that acts as a potent agonist at both cannabinoid receptors, CB1 and CB2. It was created during academic research into cannabinoid structure and pharmacology and later appeared as an active ingredient in illicit herbal smoking blends sold as synthetic cannabis [1][2]. It has no approved medical use and is controlled as an illegal substance in many countries [2].
- Extreme CB1/CB2 potency (research interest)
- Probe for the endocannabinoid system
- CB2-mediated immune signaling studies
- As a potent full agonist, its effects can be stronger and less predictable than cannabis
Overview
JWH-210 is a synthetic cannabinoid belonging to the naphthoylindole chemical class, formally named 4-ethylnaphthalen-1-yl-(1-pentylindol-3-yl)methanone [1]. Structurally it consists of an indole ring joined by a carbonyl bridge to an ethyl-substituted naphthalene group, a design that lets it mimic the actions of the cannabinoids found in cannabis [1]. It is a laboratory-made compound with no natural source and no recognized therapeutic role [2].
The substance was first prepared by the American chemist John W. Huffman and his research group, whose initials give the JWH compounds their names [1]. It was one of many indole-based cannabinoids synthesized to probe the structure-activity relationships of the cannabinoid receptors and to develop selective research tools; within its series JWH-210 emerged as one of the most potent members [1].
Like several other JWH compounds, JWH-210 later moved beyond the laboratory and was detected as an added ingredient in herbal smoking mixtures marketed as legal alternatives to cannabis and sold under names such as Spice and K2 [2][3]. Such products usually consist of plant material sprayed with one or more synthetic cannabinoids, and their potency and composition are inconsistent [3]. In response to their spread, the European Union placed these agents under early-warning monitoring, and individual governments moved to restrict them [2].
JWH-210 is now a controlled substance in many jurisdictions. It is listed as a Schedule I controlled substance in the United States, as a Class B drug in the United Kingdom, and under equivalent prohibitions in countries including Sweden, which acted against it in 2010, as well as Canada, Poland, and China [1][2].
Research on the compound has centered on its pharmacology and its risks rather than any benefit. A small observational study of volunteers who self-administered it by smoking recorded cannabis-like subjective effects, while laboratory and animal studies have flagged cytotoxic, genotoxic, and neurotoxic potential at higher exposures [2][3][4]. Because reliable human safety data are limited, the health risks of recreational use remain incompletely characterized [2].
Mechanism
JWH-210 is a member of the naphthoylindole family of synthetic cannabinoids, built on an indole core linked through a carbonyl group to a naphthalene ring [1]. It binds with high affinity to the body's cannabinoid receptors and behaves as an at both the CB1 receptor, which is concentrated in the central nervous system, and the CB2 receptor, which is found largely on immune cells [1][2]. Its measured binding affinities lie in the low nanomolar range at both receptors, making it one of the more potent compounds in its series and considerably stronger than tetrahydrocannabinol, the main psychoactive constituent of cannabis [1].
By activating CB1 receptors it produces cannabis-like, or cannabimimetic, effects; in a small observational study of people who smoked it, users reported subjective effects resembling those of THC, such as feeling intoxicated [2]. Because it is a potent full rather than the partial agonist THC, and because the amount present in a given product is unpredictable, its effects can be more intense and less controllable than those of herbal cannabis [2][3]. Laboratory studies have reported cytotoxic and genotoxic activity in human cell lines at high concentrations, and animal work has described signs of neurotoxicity, including damage to neurons in the nucleus accumbens after large doses [3][4].
receptor fingerprint
CB1 receptorfull agonist (high affinity)
CB2 receptorfull agonist
Safetyrisks and cautions, not medical advice
JWH-210 is hazardous and has no medical use. As a potent full agonist at CB1 (far more efficacious than THC's partial agonism), it carries the severe risk profile of the synthetic-cannabinoid class: acute anxiety, agitation and psychosis, tachycardia and hypertension, seizures, vomiting, and acute kidney injury, with deaths reported for the class. Tolerance, dependence and a withdrawal syndrome develop with repeated use. Potency and uneven distribution on herbal 'Spice'/'K2' substrate make real-world doses wildly unpredictable, and preclinical work flags cytotoxic and genotoxic potential. It is a controlled substance in most countries.
Subjective profileweighing the evidence above
Avoid entirely. Full CB1 agonists like this one are behind the seizures, psychosis, kidney injury and deaths that gave synthetic cannabinoids their reputation, and uneven spraying onto plant material makes every dose a gamble. It has no medical use.
Resources
This entry is here for reference.
Research
- 2005first citedStructure-activity relationships for 1-alkyl-3-(1-naphthoyl)indoles at the cannabinoid CB(1) an…
- 2021most recentAcute Pharmacological Effects and Oral Fluid Concentrations of the Synthetic Cannabinoids JWH-1…
- 1.Structure-activity relationships for 1-alkyl-3-(1-naphthoyl)indoles at the cannabinoid CB(1) and CB(2) receptors: steric and electronic effects of naphthoyl substituents. New highly selective CB(2) receptor agonists.
- 2.Acute Pharmacological Effects and Oral Fluid Concentrations of the Synthetic Cannabinoids JWH-122 and JWH-210 in Humans After Self-Administration: An Observational Study.
- 3.Toxicological profiles of selected synthetic cannabinoids showing high binding affinities to the cannabinoid receptor subtype CB₁.
- 4.Neurotoxicity of Synthetic Cannabinoids JWH-081 and JWH-210
4 listed here; entry last updated August 2026
Reviews
My notesprivate to this device
FAQ
What is JWH-210?
It is a potent synthetic cannabinoid that fully activates the CB1 and CB2 receptors, studied mainly as a research chemical and drug of abuse.
How does it compare to THC?
It binds CB1 more strongly and acts as a full agonist rather than a partial one, so its effects are much stronger and less predictable than THC.
Is it safe?
No; full-agonist synthetic cannabinoids carry real toxicity risk and this entry is reference-only, not a recommendation.
Limitations of the evidence
- Cell and animal studies suggest cytotoxic and neurotoxic potential at high doses
Adverse effects
- As a potent full agonist, its effects can be stronger and less predictable than cannabis
Notes and cautions
- It has no approved medical use and is an illegal drug in many countries
- Product potency is inconsistent because it is sprayed onto plant material