There is a jewelry-like pendant that is promoted to help with stress, enhance vitality and sleep quality, and protect against electromagnetic frequencies (EMF) and their harmful effects. Does it produce such benefits or is this all misinterpreted placebo responses?

Unfortunately, it is the latter. This is a combination of faulty assessment and interpretation of test results as well as mind control manipulation supporting the notion of its benefits. The creators of the EMF problem, the Extraterrestrial Alliance, and their technologies humans have wildly embraced again and again and again, but add increasingly to a shortening of human lifespan because of EMFs being so ubiquitous and harmful, are watching the slow awakening of humans to the EMF problem. So, as with all human attempts at self-help, they will try to throw a wrench in the works, and that is causing multiple disinformation campaigns about false protective measures that will keep people lulled into a sense of complacency, in the same way they lull the authorities into complacency about the seriousness of the problem, so regulatory agencies are continually slow to recognize and embrace the true and growing need to warn and devise effective measures to limit human exposure.