How Do Stem Cell Under Eyes Help the Darkness?

 Amazing how much urban myth and marketing is taking place around stem cells.  There are no actual (true) stem cell treatments for the lower eyes or within aesthetic surgery at this time.  Fat transfers promising an increase in stem cell numbers are misleading, IMHO as to do this, the tissue containing stem cells would need to be incubated long enough to allow the stem cells to replicate thereby increasing their numbers within that tissue.  After that, the tissue would then need to be placed into your face and or body.  Removing fat, washing, spinning or parying over it does not magically increase the number of stem cells...it's just fat with very few fat stem cells within it.

Nothing placed on or within the lower eyelid skin is likely to significantly decrease the darkness of the lower eyelid unless it's due to an increase in pigment.

We need to determine the cause of the darkness before deciding on a treatment.  There may be too much skin, which would require surgery to remove the excess.  There may be veins under the thin eyelid skin which need to be treated, or there may be pigmentation in the skin itself which requires an entirely different set of treatment options.  Stem cells are most helpful for tissue augmentation, so this would help best if the darkness under your eyes is actually due to volume loss.  You need to see a cosmetic dermatologist who specializes in dark circle treatment!  Good Luck!