The use of nuclear fusion for commercial purposes is currently being investigated. The fuel needed for fusion is readily available. Deuterium must be extracted from water. It is also toxic. Complete fusion reactions produce no long-life products.
Induced radioactivity is produced in the reactor container due to neutron flux.
Also, tritium is radioactive and quite toxic. Sustaining a fusion reaction may be possible by containing the reactants in a high temperature form of matter called plasma. Plasma particles can be contained within a magnetic field. This principle is referred to as magnetic confinement. The purpose of magnetic confinement is to avoid heat loss, not to prevent the walls of the confinement vessel from vaporizing, as often believed.