Energy bracelets
Negative ions: Mindell, Earl: The happiness-effect : The positive benefits of negative ions ; New York 2016
Germanium: Goodman, Sandra: Germanium ; the health and life enhancer ; the safe new health supplement with the power to strengthen the body's immune system, enrich its oxygen supplies and free it from toxic substances; Wellingborough 1988.
Far infrared: Ferninfrarot: Vatansever; Fatma ; Hamblin, Michael R.: Far Infrared radiation (FIR) ; its biological and medical applicatios ; in: Photonics and lasers in Medicine ; 4.2012,1, S. 255-266.
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