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Yes my dear till the late 70s lot of peiple believed crystal healing to be a myth but scientific experments have proved that Crystals do help in healing process. Crystals are mostly formed by clustering of ions. There is a very systematic clustering that happens which enables a specific geometric patrern for each crystal giving the crystal its own energy vibrationary level. It is these high energy vibrations which enables the healing at a physical level.
But crystal healing cannot be a independant therapy, it's s complimentary therapy.
What the energy of the crystals basically do is it helps clear and balance the lower and disturbed energies in our body and our energy field, which inturn helps the healing faster with any of the master therapy being done :)