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Himalayan salt lamps help because of their light. "Numerous studies have shown longer-wavelength reddish-orange lights can stimulate calming brain chemicals" (web m d).

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The placebo effect is when the suggestion of something makes it feel real. This relates to crystals because crystals don't heal, but the suggestion of it can help you heal.

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Some people think they heal because of the vibration that comes from them.

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I believed that crystals heal because I saw videos on social media.