5 Benefits of chanting "Om Namah Shivaya" are as follows :-
1) It is believed that among range of benefits stress reduction is one of the major benefits as it activated peace of mind in human brain.
2) The chant is used by many sages to connect their inner being with deep connection with divine.
3) It is very beneficial in improving your focus and concentration on various aspects of life.
4) The chant helps in cleanse negative thoughts in your mind and helps in spiritual growth and self-realization.
5) It is believed that the vibrations while chanting mantras have healing properties for mind and body