The vagus nerve is the master regulator of your parasympathetic nervous system -- the longest cranial nerve in the body, connecting your brain to your heart, lungs, gut, and virtually every major organ. Vagal tone, measured indirectly through heart rate variability, is one of the strongest predictors of stress resilience, emotional regulation, immune competence, digestive function, and overall health. High vagal tone means your body can efficiently toggle between sympathetic activation and parasympathetic recovery. Low vagal tone means you are stuck in a chronic stress response that degrades every system. The products in this collection stimulate and strengthen vagus nerve function through various mechanisms -- electrical stimulation devices, breathing-related tools, specific supplement formulations, and haptic vibration technologies. I have personally tested each product while monitoring HRV as a direct proxy for vagal tone, along with subjective stress levels, digestive function, and sleep quality. The improvements from consistent vagus nerve training are among the most immediately noticeable of any biohacking practice. As a Certified Personal Trainer who works with high-stress performers, vagal optimization is a cornerstone of my recovery protocols. Exclusive Outliyr discount codes are available. Train the nerve that controls your entire recovery system.