Stem cell implant benefits depend entirely on what the term describes in a given clinic, which is why expectations should be built on the specific procedure rather than the label. Ask what is placed, at what site, and what change is anticipated. General claims are difficult to evaluate without those details.
Where the approach involves placing cells at a specific location, the reasoning is concentration at the target. Research relevant to this varies by site and condition, and results reported for one application do not transfer to another. It is worth asking which studies relate to your situation rather than to the technique in general.
Set checkpoints before starting. Establish what would count as a meaningful result, how it would be measured, and when. Ask also what the plan would be if nothing changes, including whether further procedures would be suggested. A plan with defined review points is easier to assess honestly than one described only in terms of hoped-for outcomes. Ask what the clinic has observed in previous cases at the same site, and over what follow-up period those observations were made.
