This topic sounds like an anti-vax group lol, sorry guys but you should think about the only and safest way to gain height actually, these other “thoughts” you are spreading are just fancy, there’s no way this can happens in less than many dozens of years, you are just concerned about limb lengthening but there are many many applications of the tissues regeneration people and researchers are interested, for example cartilage (for which there is still a huge improvement about artificial protheses for several joints) and for all of these applications there’s no answer. Assuming that’s impossible to bring back your whole body to a stem cell state, how can you even think that try to stimulate a bone growth can be done without any surgery and how can you even think that this could be safer or even just cheaper than all the ways actually available that just use your natural osteogenesis to fill a gap surgically created. Bone is one of the few tissues is possible to regenerate totally with the same tissue present before, this is one of safest and more natural way to grow you have to realize this