The zero point energy wand as a medical treatment device falls into the same trap as many other alternative treatments. Without scientific analysis of the devices' workings, it is impossible to determine whether the claims about zero point energy wands are true. It's extremely important to conduct scientific analysis because a treatment's effects are otherwise indistinguishable from the placebo effect. The placebo effect is a phenomenon in which simply taking a treatment causes a person to feel better, regardless of its efficacy. It is indeed possible that people feel better after completing their zero point energy wand treatments, but without controls there's no way of knowing whether we're seeing the placebo effect or not.
Finally, there is the issue of the device's workings. Though the proponents of the wands make seemingly magical claims, they assert that the technology is actually rooted in science. Take a look at their justifications, though, and all you'll find is a bunch of scientific-sounding mumbo-jumbo with little substance. Zero point energy is a real idea: it is the term used to describe the lowest possible energy of a quantum system- that is, the energy of its ground state, which is always greater than zero. Because of this ground state energy, substances such as Helium remain liquid even at absolute zero.
Zero point energy, though, does not have any health applications. It's just a physical consequence of the Heisenberg Uncertainty principle. There is no reason to think that zero point energy is entering or otherwise affecting people's bodies when a wand is waved about. For that matter, there's no reason to think that the wand has anything to do with zero point energy. The manufacturers employ vague buzzwords like "crystals" and "resonance" to describe how their devices work, but leave out any real detail. This is a major red flag; try looking up how aspirin or caffeine or any other treatment works and you'll find reams of explanations. Look up zero point energy wands, though, and all you get is a sales pitch.
Image Source: Wikimedia Commons - Zero Point Energy vs. Motion