Currently it looks like this stuff is expensive and not well understood. But useful in extreme situations.
But it does show promise that researchers are improving their understanding of the way stem cells work.
for people who have autoimmune issues that involve Il1b or want to deal with IL1b issues doxycycline may work.
https://selfhack.com/blog/interleukin-1/
Doxy did help me but I have been afraid to try it long term for fear of developing immunity etc.
There are foods and supplements in post #2’s link that help.