Nano-X Imaging (NASDAQ: NNOX), DermTech (NASDAQ: DMTK), and Viking Therapeutics (NASDAQ: VKTX) are healthcare growth stocks with plenty of potential, little revenue, and a boatload of risk. Add in the fact that none of the companies is profitable and you have a very real potential to see these inflated share prices come back to Earth in a painful deflation. The problem I see with this is that the company will then deliver its machines, which are expensive to make, for free for use in hospitals, clinics, imaging centers, and doctor's offices.