I saw something years ago about people getting sheep umbilical cord blood injections in one European country which result in a rejuvenation effect. This might have been on 60 Minutes, but I can't remember exactly. I believe this had something to do with stem cells. I thought that maybe human umbilical cord blood would be better for humans, since its from the same species and humans have a longer life span than sheep. Recently, i started researching it online and also wondered if it could have a positive effect on blood pressure and cardiovascular disease which everyone gets as they age. There's lot of youtube videos about stem cell therapy. Today I found this page here about treating hypertension with fetal stem cells.
https://uctclinic.com/arterial-hypertension-treatment
also see
Ukraine Fetal Stem Cell Pioneers Full Documentary
https://www.youtube.com/watch?v=BDrzv-fgWII
They talk about fetal stem cells in this video. I wonder if umbilical cord stems cells would be just as good. It might depend on what condition you're treating.