Condition · Evidence Hub
Vagus Nerve Stimulation for Alzheimer's Disease
Does vagus nerve stimulation help with alzheimer's disease? 11 human studies have investigated VNS for alzheimer's disease, including 1 systematic review and 10 controlled trials, published between 2002 and 2025, with 6 published since 2022. Studies use implanted (iVNS), transcutaneous auricular (taVNS), and transcutaneous cervical (tcVNS) stimulation. Findings vary by study design and population; the studies below are ranked by evidence strength so you can weigh the research directly.
1 systematic review · 10 controlled trials
Evidence by Tier
strongest → weakest
- 1Systematic reviews & meta-analyses
- 10Controlled clinical trials
Stimulation Method
- 8iVNS
- 2taVNS
- 1tcVNS
Research Momentum
6 of 11 studies (55%) published since 2022 — an actively growing evidence base.
The studies
11 studies · strongest evidence firstAdvances in VNS efficiency and mechanisms of action on cognitive functions
Wang et al. · Frontiers in physiology · 2024
systematic reviewsiVNSLocus coeruleus fMRI response to transcutaneous auricular vagus nerve stimulation is coupled to changes in salivary alpha amylase
Schneider et al. · Brain stimulation · 2025
controlled trialstaVNSA vagal route to memory: evidence from invasive and non-invasive electrical vagus nerve stimulation studies and areas for future clinical application
Szeska et al. · Frontiers in human neuroscience · 2025
controlled trialstcVNSVagus Nerve Stimulation for Improvement of Vascular Cognitive Impairment
E et al. · Neuropsychiatric disease and treatment · 2024
controlled trialsiVNSEvaluating phasic transcutaneous vagus nerve stimulation (taVNS) with pupil dilation: the importance of stimulation intensity and sensory perception
Ludwig et al. · Scientific reports · 2024
controlled trialstaVNSMicrobiota in neuroinflammation and synaptic dysfunction: a focus on Alzheimer's disease
Bairamian et al. · Molecular neurodegeneration · 2022
controlled trialsiVNSBrain Stimulation in Alzheimer's Disease
Chang et al. · Frontiers in psychiatry · 2018
controlled trialsiVNSVagus nerve stimulation enhances perforant path-CA3 synaptic transmission via the activation of β-adrenergic receptors and the locus coeruleus
Shen et al. · The international journal of neuropsychopharmacology · 2012
controlled trialsiVNSVagus nerve stimulation in patients with Alzheimer's disease: Additional follow-up results of a pilot study through 1 year
Merrill et al. · The Journal of clinical psychiatry · 2006 · n = 17
controlled trialsiVNSBeyond the treatment of epilepsy: new applications of vagus nerve stimulation in psychiatry
Kosel et al. · CNS spectrums · 2003
controlled trialsiVNSCognition-enhancing effect of vagus nerve stimulation in patients with Alzheimer's disease: a pilot study
Sjögren et al. · The Journal of clinical psychiatry · 2002 · n = 10
controlled trialsiVNS