At present, technology has not found any products that can confirm that people grow taller without obvious side effects. Especially your so-called stones, if useful, may be highly radioactive. Besides, from your point of view, you can't grow taller with this stone, but you have to live on the island before the bone line is closed, and you can grow taller with the cooperation of daily drinking water and food on the island.

Another point is, don't forget that the European and American races are originally high, so in fact, his so-called teenage children living on the island can increase by 23 cm, which is actually a lot of water!