Stem Cell Culture, the way to look younger

Stem cell therapy is getting more popular these days not just because it hopes to cure all diseases someday but because it is believed to turn back the clock.  Yup, celebrities and even politicians are claiming to reap the benefits of this therapy.  How is it done?  Apparently, stem cell culture is done so they can regenerate and produce new cells.  These new cells will be injected to the patient to replace the ones that's been damaged.  What I'm not sure of is, if stem cell therapy is already used in hospitals to treat patients.  But I am definitely sure that this treatment is already used in beauty clinics to make their clients achieve a youthful look.