Cannabinoid Encyclopedia

How cannabinoids work

What is FAAH?

A simple explanation of FAAH, why cannabinoid researchers study it, and what its biology can and cannot tell us.

Updated July 2026 49 research sources Human and early research

The short answer

Where FAAH fits into cannabinoid biology

FAAH is a biological target studied to understand how cannabinoids affect cells and signaling. Research on THC, CBG, CBN, and CBC helps explain possible mechanisms. This page brings together 10 human-study sources, 26 research reviews, and 13 lab, animal, or mechanism sources. The source set includes human research as well as earlier-stage studies. A mechanism alone does not prove that a cannabinoid will produce a health benefit in people. 1

Choose your next step

Want the quick path or the full picture?

Use this guide the way you need to. Start with the practical question, then open the study detail only when it helps answer something about FAAH.

What researchers studiedSee the main areas and the evidence behind each one. Safety and limitsKeep product, dose, medications, and context in view. Open the sourcesGo directly to the studies and references used here.

Key takeaways

What to know first

  1. 1

    Research on FAAH covers THC, CBG, and CBN; those areas should not be combined into one claim. 1

  2. 2

    The source set includes human research as well as earlier-stage studies. 2

  3. 3

    Dose, formulation, route, study population, and outcome can change how closely a study applies to a real-world question. 3

Research areas

What researchers studied about FAAH

These are the main questions represented in the current literature. Each link opens a source used to build the overview.

Human research included

THC

Studies examine how THC connects with FAAH or closely related target biology. These findings help explain signaling and pharmacology, not a guaranteed health effect. 2

Too limited for a firm answer

CBG

Studies examine how CBG connects with FAAH or closely related target biology. These findings help explain signaling and pharmacology, not a guaranteed health effect. 3

Mostly mechanism-focused

CBN

Studies examine how CBN connects with FAAH or closely related target biology. These findings help explain signaling and pharmacology, not a guaranteed health effect. 4

Mostly mechanism-focused

CBC

Studies examine how CBC connects with FAAH or closely related target biology. These findings help explain signaling and pharmacology, not a guaranteed health effect. 5

Mostly mechanism-focused

THCV

Studies examine how THCV connects with FAAH or closely related target biology. These findings help explain signaling and pharmacology, not a guaranteed health effect. 6

Mostly mechanism-focused

Anandamide

Studies examine how Anandamide connects with FAAH or closely related target biology. These findings help explain signaling and pharmacology, not a guaranteed health effect. 7

How strong is the research?

Not every study answers the same question

This page separates research in people, research reviews, and earlier-stage biology before interpreting the larger question.

10 sources

Human studies

Research involving people is closest to everyday health questions. The product, dose, population, and outcome still determine what each study can show.

26 sources

Reviews and evidence summaries

Reviews can compare several studies at once. Their conclusion is only as strong and as relevant as the studies they include.

13 sources

Lab, animal, and mechanism research

Early-stage research can explain biological interest. It cannot, by itself, show that the same effect happens in people.

What these studies actually looked at

The research on FAAH is not one kind of study. This source set includes 25 narrative or expert reviews, 15 animal studies, 4 cell or laboratory studies, and 2 clinical studies in people. 3

The recorded populations or models include animal models (17 sources), people or patients (15 sources), and cells or tissue models (5 sources). A result from one group or model should not be assumed to apply to another. 4

The most common recorded outcome focus is endocannabinoid enzyme activity or metabolic mechanisms (16 sources), anandamide biology, receptor pharmacology, metabolism, physiology, or safety-relevant mechanisms (6 sources), and oleamide biology, sleep-related physiology, receptor pharmacology, metabolism, or safety-relevant mechanisms (6 sources). Closely related outcome names can still describe different measurements. 5

The FAAH source set also contains findings or reviews that remain too limited, indirect, or mixed for a broad answer. That uncertainty is part of the result, not an empty space to fill with assumptions. 6

Examples from the literature

What did the studies actually look at?

Each example names the research question and the study details recorded for that source.

narrative or expert review

Potential of Fatty Acid Amide Hydrolase (FAAH), Monoacylglycerol Lipase (MAGL), and Diacylglycerol Lipase (DAGL) Enzymes as Targets for Obesity Treatment: A Narrative Review.

On this page, this source examines Endocannabinoids activity involving endocannabinoid enzyme activity or metabolic mechanisms. 1

Study type
narrative or expert review
Population or model
people or patients
Outcome focus
endocannabinoid enzyme activity or metabolic mechanisms
Evidence stage
evidence still limited

narrative or expert review

FAAH and MAGL inhibitors: therapeutic opportunities from regulating endocannabinoid levels.

On this page, this source examines THC activity involving endocannabinoid enzyme activity or metabolic mechanisms. 2

Study type
narrative or expert review
Population or model
cells or tissue models
Outcome focus
endocannabinoid enzyme activity or metabolic mechanisms
Evidence stage
evidence still limited

systematic review or meta-analysis

The Use of Cannabinoids in Colitis: A Systematic Review and Meta-Analysis.

On this page, this source examines CBG and inflammation-related outcomes. 3

Study type
systematic review or meta-analysis
Population or model
animal models
Outcome focus
inflammation-related or immune outcomes
Evidence stage
evidence still limited

cell or laboratory study

Cannabinol modulates the endocannabinoid system and shows TRPV1-mediated anti-inflammatory properties in human keratinocytes.

On this page, this source examines CBN and skin and inflammatory dermatology. 4

Study type
cell or laboratory study
Population or model
people or patients
Outcome focus
skin, dermatology, inflammatory, or immune-modulation outcomes
Evidence stage
mechanism-focused research

cell or laboratory study

Effects of Rare Phytocannabinoids on the Endocannabinoid System of Human Keratinocytes.

On this page, this source examines CBC and skin and inflammatory dermatology. 5

Study type
cell or laboratory study
Population or model
people or patients
Outcome focus
skin, dermatology, antimicrobial, or topical inflammatory outcomes
Evidence stage
mechanism-focused research

Safety and limits

What should readers keep in mind?

Research on FAAH should be read beside safety. A compound can be non-intoxicating or naturally occurring and still have pharmacologic effects, side effects, interactions, or product-quality concerns. 7

Research doses are descriptions of what a study tested. They are not personal dosing instructions. Questions involving medications, pregnancy, children, driving, liver health, heart health, or serious symptoms deserve professional medical guidance.

Drug interactions Pregnancy and children Driving and impairment All safety topics

Common questions

Questions people ask

What does FAAH do?

FAAH is studied as part of cannabinoid-related biology and signaling. The exact role depends on the tissue, compound, and experimental setting. 7

Does a biological mechanism prove a health effect?

No. A mechanism can explain why an idea is plausible, but human studies are needed to test whether it changes a health outcome. 8

What research is linked to FAAH?

The main areas on this page include THC, CBG, CBN, and CBC. The source links show the study type behind each area. 9

Sources

Read the research

The numbered sources below support the main overview. Links open the PubMed record or DOI in a new tab.

  1. 1
    Potential of Fatty Acid Amide Hydrolase (FAAH), Monoacylglycerol Lipase (MAGL), and Diacylglycerol Lipase (DAGL) Enzymes as Targets for Obesity Treatment: A Narrative Review. narrative or expert review; evidence still limited PubMed 34959715 DOI 10.3390/ph14121316
  2. 2
    FAAH and MAGL inhibitors: therapeutic opportunities from regulating endocannabinoid levels. narrative or expert review; evidence still limited PubMed 20047159
  3. 3
    The Use of Cannabinoids in Colitis: A Systematic Review and Meta-Analysis. systematic review or meta-analysis; evidence still limited PubMed 29562280 DOI 10.1093/ibd/izy014
  4. 4
    Cannabinol modulates the endocannabinoid system and shows TRPV1-mediated anti-inflammatory properties in human keratinocytes. cell or laboratory study; mechanism-focused research PubMed 39275884 DOI 10.1002/biof.2122
  5. 5
    Effects of Rare Phytocannabinoids on the Endocannabinoid System of Human Keratinocytes. cell or laboratory study; mechanism-focused research PubMed 35628241 DOI 10.3390/ijms23105430
  6. 6
    Effects of cannabinoids and cannabinoid-enriched Cannabis extracts on TRP channels and endocannabinoid metabolic enzymes. animal study; mechanism-focused research PubMed 21175579 DOI 10.1111/j.1476-5381.2010.01166.x
  7. 7
    Metabolism of endocannabinoids. narrative or expert review; evidence still limited PubMed 27516570 DOI 10.5604/17322693.1213898
  8. 8
    Cannabinergic ligands. narrative or expert review; evidence still limited PubMed 12505686 DOI 10.1016/s0009-3084(02
  9. 9
    Pharmacogenetics of new analgesics. narrative or expert review; evidence still limited PubMed 20942817 DOI 10.1111/j.1476-5381.2010.01074.x
  10. 10
    Biochemical and pharmacological characterization of human α/β-hydrolase domain containing 6 (ABHD6) and 12 (ABHD12). human research PubMed 22969151 DOI 10.1194/jlr.m030411
  11. 11
    Impact of tetrahydrocannabinol on the endocannabinoid 2-arachidonoylglycerol metabolism: ABHD6 and ABHD12 as novel players in human placenta. human research PubMed 32829065 DOI 10.1016/j.bbalip.2020.158807
  12. 12
    Targeting the endocannabinoid system for management of HIV-associated neuropathic pain: A systematic review. clinical study in people; preclinical research PubMed 34179865 DOI 10.1016/j.ibneur.2021.01.004
See all 49 research sources

This complete source list is the deeper research layer for the page. Study type and evidence context are shown when they are available in the current record.

  1. Cannabidivarin Treatment Ameliorates Autism-Like Behaviors and Restores Hippocampal Endocannabinoid System and Glia Alterations Induced by Prenatal Valproic Acid Exposure in Rats. animal study; mechanism-focused research / 1 linked research note PubMed 31447649
  2. Targeting the endocannabinoid system for management of HIV-associated neuropathic pain: A systematic review. clinical study in people; preclinical research / 1 linked research note PubMed 34179865
  3. Potential application of endocannabinoid system agents in neuropsychiatric and neurodegenerative diseases-focusing on FAAH/MAGL inhibitors. narrative or expert review; evidence still limited / 1 linked research note PubMed 32203086
  4. Inhibition of endocannabinoid hydrolases MAGL, FAAH and ABHD6 by AKU-005 reduces ex vivo cortical spreading depression. animal study; mechanism-focused research / 1 linked research note PubMed 40269679
  5. The role of endocannabinoid pathway in the neuropathology of Alzheimer's disease: Can the inhibitors of MAGL and FAAH prove to be potential therapeutic targets against the cognitive impairment associated with Alzheimer's disease? narrative or expert review; evidence still limited / 1 linked research note PubMed 34217798
  6. FAAH and MAGL inhibitors: therapeutic opportunities from regulating endocannabinoid levels. narrative or expert review; evidence still limited / 1 linked research note PubMed 20047159
  7. Potential of Fatty Acid Amide Hydrolase (FAAH), Monoacylglycerol Lipase (MAGL), and Diacylglycerol Lipase (DAGL) Enzymes as Targets for Obesity Treatment: A Narrative Review. narrative or expert review; evidence still limited / 1 linked research note PubMed 34959715
  8. Inhibition of endocannabinoid synthesis enzymes DAGL and NAPE-PLD transiently lowers body weight and alters glucose homeostasis during a high-fat diet challenge in mice. animal study; mechanism-focused research / 1 linked research note PubMed 41092478
  9. Subcellular localization of NAPE-PLD and DAGL-α in the ventromedial nucleus of the hypothalamus by a preembedding immunogold method. animal study; preclinical research / 1 linked research note PubMed 24346263
  10. Microglial morphological/inflammatory phenotypes and endocannabinoid signaling in a preclinical model of periodontitis and depression. animal study; mechanism-focused research / 1 linked research note PubMed 39245706
  11. Critical enzymes involved in endocannabinoid metabolism. narrative or expert review; evidence still limited / 1 linked research note PubMed 17346227
  12. Chemical Probes for Investigating the Endocannabinoid System. narrative or expert review; evidence still limited / 1 linked research note PubMed 39747798
  13. Structural properties and role of the endocannabinoid lipases ABHD6 and ABHD12 in lipid signalling and disease. narrative or expert review; evidence still limited / 1 linked research note PubMed 30564946
  14. Impact of tetrahydrocannabinol on the endocannabinoid 2-arachidonoylglycerol metabolism: ABHD6 and ABHD12 as novel players in human placenta. human research / 1 linked research note PubMed 32829065
  15. The serine hydrolases MAGL, ABHD6 and ABHD12 as guardians of 2-arachidonoylglycerol signalling through cannabinoid receptors. narrative or expert review; evidence still limited / 1 linked research note PubMed 21418147
  16. Deregulation of the endocannabinoid system and therapeutic potential of ABHD6 blockade in the cuprizone model of demyelination. animal study; preclinical research / 1 linked research note PubMed 30075103
  17. Biochemical and pharmacological characterization of human α/β-hydrolase domain containing 6 (ABHD6) and 12 (ABHD12). human research / 1 linked research note PubMed 22969151
  18. Modulators of the endocannabinoid system influence skin barrier repair, epidermal proliferation, differentiation and inflammation in a mouse model. animal study; mechanism-focused research / 1 linked research note PubMed 31350927
  19. Effects of cannabinoids and cannabinoid-enriched Cannabis extracts on TRP channels and endocannabinoid metabolic enzymes. animal study; mechanism-focused research / 3 linked research notes PubMed 21175579
  20. Regulation of nausea and vomiting by cannabinoids. narrative or expert review; evidence still limited / 1 linked research note PubMed 21175589
  21. Cannabinol modulates the endocannabinoid system and shows TRPV1-mediated anti-inflammatory properties in human keratinocytes. cell or laboratory study; mechanism-focused research / 1 linked research note PubMed 39275884
  22. Effects of cannabidiol, cannabichromene, cannabidivarin, cannabigerol and cannabinol in endometrial cells: Implications for endocrine and senescence modulation. cell or laboratory study; mechanism-focused research / 2 linked research notes PubMed 40706771
  23. The Use of Cannabinoids in Colitis: A Systematic Review and Meta-Analysis. systematic review or meta-analysis; evidence still limited / 1 linked research note PubMed 29562280
  24. Effects of Rare Phytocannabinoids on the Endocannabinoid System of Human Keratinocytes. cell or laboratory study; mechanism-focused research / 1 linked research note PubMed 35628241
  25. Rare Phytocannabinoids Exert Anti-Inflammatory Effects on Human Keratinocytes via the Endocannabinoid System and MAPK Signaling Pathway. cell or laboratory study; mechanism-focused research / 1 linked research note PubMed 36769042
  26. Potential of Cannabinoid Receptor Ligands as Treatment for Substance Use Disorders. narrative or expert review; evidence still limited / 1 linked research note PubMed 31549358
  27. Cannabinergic ligands. narrative or expert review; evidence still limited / 3 linked research notes PubMed 12505686
  28. Endocannabinoid System: A Multi-Facet Therapeutic Target. narrative or expert review; evidence still limited / 1 linked research note PubMed 27086601
  29. The elmiric acids: biologically active anandamide analogs. narrative or expert review; evidence still limited / 1 linked research note PubMed 18187165
  30. Palmitoylethanolamide and other anandamide congeners. Proposed role in the diseased brain. narrative or expert review; evidence still limited / 2 linked research notes PubMed 20353771
  31. Fatty acid amide hydrolase (FAAH) and the endocannabinoid system in obesity: Mechanistic insights and pharmacological opportunities beyond incretin-based therapies. narrative or expert review; evidence still limited / 1 linked research note PubMed 42144898
  32. The TRPV1 channel regulates glucose metabolism. animal study; mechanism-focused research / 1 linked research note PubMed 31408376
  33. Pharmacogenetics of new analgesics. narrative or expert review; evidence still limited / 1 linked research note PubMed 20942817
  34. Transcriptomic signature, bioactivity and safety of a non-hepatotoxic analgesic generating AM404 in the midbrain PAG region. clinical study in people; mechanism-focused research / 1 linked research note PubMed 38750093
  35. Structure-affinity relationships and pharmacological characterization of new alkyl-resorcinol cannabinoid receptor ligands: Identification of a dual cannabinoid receptor/TRPA1 channel agonist. animal study; mechanism-focused research / 1 linked research note PubMed 25065940
  36. Metabolism of endocannabinoids. narrative or expert review; evidence still limited / 1 linked research note PubMed 27516570
  37. Cannabinoid CB1 receptors regulate salivation. animal study; mechanism-focused research / 1 linked research note PubMed 35986066
  38. Supersensitivity to anandamide and enhanced endogenous cannabinoid signaling in mice lacking fatty acid amide hydrolase. animal study; mechanism-focused research / 1 linked research note PubMed 11470906
  39. Targeting Endocannabinoid Signaling: FAAH and MAG Lipase Inhibitors. narrative or expert review; evidence still limited / 1 linked research note PubMed 32867595
  40. Chemical probes of endocannabinoid metabolism. narrative or expert review; evidence still limited / 1 linked research note PubMed 23512546
  41. Amygdala FAAH and anandamide: mediating protection and recovery from stress. narrative or expert review; evidence still limited / 1 linked research note PubMed 24325918
  42. Endocannabinoid hydrolases. narrative or expert review; evidence still limited / 2 linked research notes PubMed 12432941
  43. Fatty acid amide hydrolase, an enzyme with many bioactive substrates. Possible therapeutic implications. narrative or expert review; evidence still limited / 1 linked research note PubMed 11945157
  44. Oleamide: a fatty acid amide signaling molecule in the cardiovascular system? narrative or expert review; evidence still limited / 1 linked research note PubMed 17445087
  45. The sleep inducing factor oleamide is produced by mouse neuroblastoma cells. animal study; mechanism-focused research / 1 linked research note PubMed 9344854
  46. The enzymatic inactivation of the fatty acid amide class of signaling lipids. narrative or expert review; evidence still limited / 1 linked research note PubMed 12505696
  47. Oleamide: an endogenous sleep-inducing lipid and prototypical member of a new class of biological signaling molecules. narrative or expert review; evidence still limited / 1 linked research note PubMed 10197045
  48. N-Docosahexaenoylethanolamine is a potent neurogenic factor for neural stem cell differentiation. animal study; mechanism-focused research / 1 linked research note PubMed 23570577
  49. Involvement of N-acylethanolamine-hydrolyzing acid amidase in the degradation of anandamide and other N-acylethanolamines in macrophages. animal study; mechanism-focused research / 1 linked research note PubMed 16154384