Over the last week I have received numerous questions about a recent study (yet to be published, but highly publicized in the press) in which it is claimed that the application of a magnetic field can improve blood flow. Physics World declared in the headline that, “Magnetic fields reduce blood viscosity.” This is not a bad summary of the study, but then the first sentence claims:
Researchers in the US claim that exposing a person to a magnetic field could reduce their risk of a heart attack by streamlining the flow of blood around their body.
Science Magazine ran with the also tame headline of “Magnets Keep Blood Flowing” but also had some problems in the text of their report (which I will get to).
The amount of press attention the study is getting is a bit odd. It’s a small proof-of-concept study looking at the effects of strong magnetic fields on blood flow in vitro. I suspect part of the reason is the same as why so many people have been asking me about it – magnets are frequently marketed with health claims and these claims are often justified by the hand-waving explanation that magnetic fields improve blood flow. The concern is that this small study will be abused by huxsters to sell refrigerator magnets with unfounded health claims.