Cranial Electrical Stimulation: Research and Status
What cranial electrical stimulation is, what trials show for anxiety, insomnia, depression and pain, and what the FDA's 2019 order about this device type does and does not say.
Content last updated . This page has not been medically reviewed.
Status in the United States (FDA, read 2026-10-22)
The FDA regulates this as a type of device, and the rules depend on the condition the device claims to treat. [2]| Intended use | FDA classification as read | What that means |
|---|---|---|
| Anxiety and/or insomnia | Class II (special controls) [1] | Makers must meet special controls, including a summary of clinical testing that shows effectiveness for that use. [1] |
| Depression | Premarket approval required [2] | The 2019 final order set the effective date of the premarket approval requirement for devices intended to treat depression. [2] |
The same order reclassified devices for anxiety and/or insomnia from class III to class II. [2] It also confirmed that CES is a prescription-only device for anxiety, insomnia and depression. [2] In the order, the FDA said it does not intend to enforce the premarket approval requirement against a currently legally marketed device while the FDA reviews that maker's application. [2]
Three limits matter. First, this is a classification of a device type, not an endorsement of any product. I did not verify the clearance or approval record of any individual CES product, so a seller's claim that a product is "FDA cleared" has to be checked against that product's own record. Second, a classification does not show that every marketing claim is true. Third, I did not verify the status of CES in other countries.
What research shows
The best overview is a 2018 systematic review of randomized trials. It found 26 trials (reported in 28 articles). [3] Its main conclusion was that evidence is insufficient that CES has clinically important effects on fibromyalgia, headache, neuromusculoskeletal pain, degenerative joint pain, depression or insomnia, with low-strength evidence of a modest benefit in anxiety and depression. [3] All trials had a high risk of bias because of inadequate blinding, and most were small and short. [3] Blinding matters because a person who can tell the device is off may expect less benefit.| Use | What was found | Label |
|---|---|---|
| Anxiety | A 2022 meta-analysis of 11 randomized trials found less anxiety with CES than with control (Hedges g -0.625). [4] A 2023 meta-analysis of 8 trials found a similar direction. [5] In that review, four trials used the same device. [5] | Promising but limited |
| Depression | A Cochrane review found no trials that met its quality bar. [6] The 2018 review also judged the evidence insufficient. [3] | Insufficient evidence |
| Insomnia | Trials in insomnia, and in insomnia with anxiety, had inconclusive or conflicting results. [3] | Insufficient evidence |
| Pain | Fourteen sham-controlled trials in painful conditions had conflicting results. [3] | Mixed |
Reading the table: pooling small trials can look more certain than it is. The anxiety meta-analyses came after the 2018 review and pool small trials (337 and 794 participants in total), in a field where the earlier review rated every trial as high risk of bias. [5][4][3] Results from one device's trials should not be applied to other devices with similar names.
How to evaluate a CES claim
- Ask which use the FDA classification covers: anxiety or insomnia, or depression.
- Ask whether the claim comes from sham-controlled trials of that same device.
- Be careful with patient stories. In its order, the FDA said statements by individual health professionals that they used CES on individual patients are not valid scientific evidence of safety and effectiveness. [2]
- Compare with approaches that have clearer evidence for the same problem. See stress, anxiety, burnout and depression.
For home devices and consumer claims, see clinical vs consumer brain stimulation devices and DIY brain stimulation risks.
Frequently asked questions
Is cranial electrical stimulation FDA approved?
It depends on the use and on the product. The FDA classified CES devices for anxiety and/or insomnia as class II. [1] For depression, the 2019 order required premarket approval. [2] That describes the device type. I did not verify any single product's record.
Does CES work for anxiety?
Small randomized trials and two meta-analyses lean toward a benefit. [4][5] A 2018 systematic review rated the evidence for anxiety as low-strength and noted that all trials had a high risk of bias from inadequate blinding. [3] The label here is promising but limited.
Does CES help with sleep or insomnia?
The evidence is insufficient. Trials in insomnia had inconclusive or conflicting results. [3]
Is CES the same as ECT or TMS?
No. CES uses a current not intended to cause a seizure. [1] ECT is a different procedure given under anesthesia, and TMS uses magnetic pulses. See Transcranial Magnetic Stimulation.
Is it safe?
Low-strength evidence suggests no serious side effects, and ear discomfort was the most common problem reported in one meta-analysis. [3][4] Long-term safety is not established in what I read.
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
How to read the evidence labels
Labels used on this page: insufficient evidence (too little reliable human research), promising but limited (small or short studies pointing one way) and mixed (studies disagree). See how we label evidence.
Safety
References
- Electronic Code of Federal Regulations. 21 CFR 882.5800, Cranial electrotherapy stimulator. Read 2026-10-22.
- U.S. Food and Drug Administration, Federal Register final order, Dec 20, 2019. Neurological Devices; Reclassification of Cranial Electrotherapy Stimulator Devices Intended To Treat Anxiety and/or Insomnia; Effective Date of Requirement for Premarket Approval for Cranial Electrotherapy Stimulator Devices Intended To Treat Depression. Read 2026-10-22.
- Shekelle et al. Benefits and Harms of Cranial Electrical Stimulation for Chronic Painful Conditions, Depression, Anxiety, and Insomnia: A Systematic Review. Annals of internal medicine, 2018. Read 2026-10-22.
- Ching et al. Efficacy and Tolerability of Cranial Electrotherapy Stimulation in the Treatment of Anxiety: A Systemic Review and Meta-Analysis. Frontiers in psychiatry, 2022. Read 2026-10-22.
- Chung et al. Efficacy of electrical cranial stimulation for treatment of psychiatric symptoms in patients with anxiety: A systematic review and meta-analysis. Frontiers in psychiatry, 2023. Read 2026-10-22.
- Kavirajan et al. Alternating current cranial electrotherapy stimulation (CES) for depression. The Cochrane database of systematic reviews, 2014. Read 2026-10-22.