I'm so thin thin and want to grow some muscle without any taking pills. is there any natural way of increasing muscle.

Eat protein: That's the best way, along with exercise of course to make muslces want to use that protein to grow. There is a product, not a pill, callled Myo-T12 or Myo-X that is a myostatin inhibitor, reported to grow muscle specifically by blocking an enzyme that stops muscle growth. It is made from fertilized egg yolk and is granular, tastes rather like egg nog. Some scientific evidence that it works.