What Do You Think of Microcurrent Devices Such As NuFace?

I am 57, slim, with good skin (thanks to years of Retin-A and good sunscreen), but my lower face is starting to look a little droopy. Do you feel that microcurrent devices help to build collagen and firm the skin, with regular use, (as they claim)? Are they safe? I'm trying to postpone a lower face lift for a few years.

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