There are four categories of membership comprising Full, Associate, Honorary and Friends:

Full members: those who have graduated from the ISRN or other bodies and who adhere to its philosophy, principles and practice.

Associate members: practitioners trained by the ISRN or other Natural Therapeutic bodies whose practice is informed by the ISRN philosophy but who may have divergent approaches.

Honorary members: supporters of the ISRN who the Society has invited to join in an honorary capacity because it is felt their background, support and beliefs enhance the aims and objectives of the Society.

Friends: individuals who are sympathetic to the principles of the ISRN and wish to support its aims and objectives.