In the global push to expand oxygen access, we often focus on the supply: the concentrators, the cylinders, the PSA plants. A critical, often overlooked component of oxygen delivery, however, can undermine our best efforts. Medical oxygen is a dry, cold gas. Delivering it directly to a patient, especially over long periods, can cause significant harm, including patient discomfort and severe clinical complications. This is a critical issue of clinical outcomes. At Oxygen Alliance, our work on the front lines has shown us that the method of oxygen delivery is profoundly important. Humidification is a non-negotiable pillar of effective respiratory care.