Condition · Evidence Hub
Vagus Nerve Stimulation for Alzheimer's Disease
Does vagus nerve stimulation help with alzheimer's disease? 10 human studies have investigated VNS for alzheimer's disease, including 1 systematic review, 4 controlled trials, and 5 narrative reviews, published between 2002 and 2025, with 5 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 · 4 controlled trials · 5 narrative reviews
Evidence by Tier
strongest → weakest
- 1Systematic reviews & meta-analyses
- 4Controlled clinical trials
- 5Narrative & scoping reviews
Stimulation Method
- 8iVNS
- 1taVNS
- 1tcVNS
Research Momentum
5 of 10 studies (50%) published since 2022 — an actively growing evidence base.
The studies
10 studies · strongest evidence firstAdvances in VNS efficiency and mechanisms of action on cognitive functions
Wang et al. · Frontiers in physiology · 2024
systematic reviewsiVNSEvaluating phasic transcutaneous vagus nerve stimulation (taVNS) with pupil dilation: the importance of stimulation intensity and sensory perception
Ludwig et al. · Scientific reports · 2024
controlled trialstaVNSVagus 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 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 trialsiVNSA 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
narrative reviewstcVNSVagus Nerve Stimulation for Improvement of Vascular Cognitive Impairment
E et al. · Neuropsychiatric disease and treatment · 2024
narrative reviewsiVNSMicrobiota in neuroinflammation and synaptic dysfunction: a focus on Alzheimer's disease
Bairamian et al. · Molecular neurodegeneration · 2022
narrative reviewsiVNSBrain Stimulation in Alzheimer's Disease
Chang et al. · Frontiers in psychiatry · 2018
narrative reviewsiVNSBeyond the treatment of epilepsy: new applications of vagus nerve stimulation in psychiatry
Kosel et al. · CNS spectrums · 2003
narrative reviewsiVNS