OK, those who say magnetic fields have no effect can buy a relatively inexpensive Magnetizer (as I once did) and try performing a controlled experiment (as I attempted) with the rusting of iron. There is some apparent evidence that alignment of magnetic fields can promote radical activity.
This UK study on the effect of a magnetizer in reducing the amount of chlorinating pool chemicals required, is an example of a successful application. Reference, see Magnetic treatment of swimming pool water for enhanced chemical oxidation and disinfecting.
However, with respect to possible applications and significant results, apparently electrochemistry applications are at the top. For example, see Zou, P.; Leddy, J., Magnetized Nickel Electrodes for Improved Charge and Discharge Rates in Nickel Metal Hydride and Nickel Cadmium Batteries, in Electrochemical and Solid-State Letters 2006, 9, A43-A45. To quote from the article:
...magnetized electrodes yielded higher currents than the corresponding nonmagnetic electrodes by 70 and 230 %, respectively.
Source material for background includes Magnetic field induced motion behavior of gas bubbles in liquid, by Keliang Wang, Pucheng Pei, Yu Pei, Ze Ma, Huachi Xu & Dongfang Chen, in Scientific Reports 6, Article number:21068 (2016), doi:10.1038/srep21068 ), interesting article comments include:
the kinetics of oxygen bubbles is mainly proportional to intensity of the electromagnetic field. The magnetic-field induced rotational motion of oxygen bubbles in a square electrolyzer can increase liquid hydrodynamics, thus solve the problems of oxygen bubbles coalescence, and uneven distribution of electrolyte composition and temperature. These types of oxygen bubbles movement will not only improve energy saving and metal deposition for energy storage and metal refinery, but also propel object motion in application to medical and martial fields.
Note, with my experiment reported above with iron rusting, I observed significant more frothing/air bubbling activity around iron in the presence of the Magnetizer. One could look at my experiment as a crude rendition of an iron metal/air battery cell with the Magnetizer forming a magnetic iron electrode.
Finally, a link to a prior StackExchange comment on the topic here.