I finally got my ultrasound and first tried the gel in the pack but I now have bumps in the area on my neck. I switched to aloe vera but it still hasn't settled. I am wondering if I am reacting to the gel or the ultrasound itself. I have got inflammatory rosacea. Anyone else experienced this? Thank you

The internal geometry of a 3D-printed conduit, such as the Nemuri Pendant, modulates respiratory resistance to induce a parasympathetic shift without electronic intervention. By adding calibrated resistance to the airway, the device facilitates a reduction in respiratory rate to the 4–6 breaths per minute range. This specific frequency optimizes heart rate variability and maximizes vagal tone by extending the exhalation phase. The mechanism relies on fluid dynamics rather than firmware. As the user breathes through the tuned internal channel, the added load engages the diaphragm and throat muscles more deliberately. This engagement, combined with soft pressure feedback, triggers the diving reflex to lower the heart rate and suppress sympathetic arousal. Physical markers of this vagal activation typically manifest within 90 seconds. Users observe a softening of the periorbital muscles and a release of tension in the trapezius and levator scapulae. The shift is a direct result of lengthening the expiratory phase, which enhances the inhibitory influence of the vagal efferents on the sinoatrial node. A rhythm of 4-second inhalations and 6-second exhalations through this resistance provides a structured method for retraining baseline breathing patterns. Because the device requires no batteries or apps, it serves as a permanent analog interface for nervous system regulation. It is a tool for immediate recovery after high-cortisol events or for maintaining autonomic balance during daily transitions. https://www.frontiersin.org/articles/10.3389/fnhum.2018.00353/full https://pubmed.ncbi.nlm.nih.gov/21939457/ https://vagushub.com/nemuri

I'll log my experiences here if that is ok. Got my device. Just learning to use it but seems fairly simple. I did 5 minutes on low around my knee and bit on stomach 36 point. Zero heating of tissue, no noticeable negative effects. Will take a walk in a few hours and see how the hills feel. I wasn't having any specific knee issues but sometimes that one can complain, so seems a reasonable test spot. Will try on the left ribs / splenic flexure area in a bit. Nice that the device has a warmup feature. Nearly silent when on low but I could hear the buzz.

I am already running low on the 8oz gel that came with the unit and I found this on Amazon, 1 litre size for around $15. Has anyone found a better deal anywhere else? Is all Gel the same or should I be looking for anything special? https://a.co/d/0ctrk3PY

Jerry Li, an electrical engineering concentrator, developed a flexible cuff as his senior capstone project. The cuff uses ultrasound rather than electrical currents to stimulate the vagus nerve with precision. The approach is presented as having the potential to be less invasive and more targeted than prior methods. Applications noted include future treatment of depression, epilepsy, or support for neuroprosthetic control. Li stated that to his knowledge no one has used microfabricated ultrasound transducers for peripheral nerve stimulation before. Microfabrication work began in May 2025 and continued over the summer. Electronics design was the focus during the academic year. The microfabrication process itself was described as the most challenging element, characterized as a long and detailed procedure even with expert guidance. The project drew on multiple disciplines including neuroscience, phased array theory, wireless charging, and mechanical prototyping. Li noted that the interdisciplinary scope helped build his confidence as an engineer. The work was conducted under the Harvard John A. Paulson School of Engineering and Applied Sciences. https://www.facebook.com/hseas/posts/for-his-senior-capstone-project-electrical-engineering-concentrator-jerry-li-dev/1342732331285198/