Who invented the spiral pill?

Namikaze Minato. Spiral Pill is an endurance skill in the anime Naruto, which was invented by four generations of Naruto Namikaze Minato. The inspiration comes from observing the formation principle of Bijyudama, bijuu's main attack means, even though the chakras are highly compressed and rapidly rotating. When Namikaze Minato was developing spiral pills, after a long period of research and development, he finally succeeded in creating this powerful endurance.