The best replacement for microcurrent is tens.

The best alternatives to microcurrent are rated as following:
★★★★★  tens
★★★★  galvanic
★★★  radio frequency
★★★  high frequency
★★  microdermabrasion
★★  dermawand
★★  ultherapy
★  led light therapy
★  nuface
  faradic
  galvanic current
  fsm

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Speaking about microcurrent, one probably shouldn't forget about elastin infusion.

Other search terms related to microcurrent and their ratings are:
★★★★★ elastin infusion
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microcurrent
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