Ketamine gives hope to patients with severe depression. But some clinics stray from the science and hype its benefits

Walk into Kalypso Wellness Centers in San Antonio, Texas, and you might be treated with one of five “proprietary blends” of ketamine. They’re not cheap — $495 per infusion — and not covered by insurance, but the company offers a “monthly” membership program to cut costs and advertises discounts for members of the military and first responders.