Online Diploma in Aromatherapy - Master Aromatherapist

Total Credits Completed

This advanced Diploma program is an in-depth study of the science and art of aromatherapy. Students study essential oil materia medica including botanical information, identification, sources, historical uses, parts used, cultivation, harvesting, production, characteristics, active constituents, therapeutic actions, medicinal uses, evidence-based uses, household uses, and perfumery. Students also study anatomy and physiology including holistic clinical correlates covering a wide range of integrative health modalities from aromatherapy and herbal studies to nutrition and wellness protocols. Students also study aromatherapy chemistry and the steps to set up a business.


Exceeds the curriculum requirements of the NAHA Level III education standards
Meets the curriculum requirements of the Alliance of International Aromatherapists’ Advanced Practitioner Aromatherapy education standards
Qualify to sit the national registration exam with the Aromatherapy Registration Council and become a Registered Aromatherapist (RA)
ACHS Aromatherapy graduates have a five year (2012-2016) success rate of 100% on the Aromatherapy Registration Council National Exam leading to registration as a Registered Aromatherapist.

Learning Outcomes

Outline the steps to set up a business, including insurance, management, legal issues, ethics (including AHG ethics and ARC requirements), keeping records, listening and observation skills, informed consent, marketing, business planning, nutritional, lifestyle, and wellness counseling
Locate information from state regulatory bodies to ensure compliance with local and state requirements
Educate others about appropriate holistic health protocols using essential oils to support and rebalance the body and restore wellness for general good health
Discuss aromatherapy, its history, use, and status of current research, including how to locate studies in peer-reviewed journals
Blend and administer essential oils safely
Discuss the Latin names, therapeutic uses, active constituents, methods of administration, and cautions and contraindications for each of the 56 essential oils studied
Discuss the chemistry and pharmacology of the functional groups of essential oil constituents, their therapeutic actions and contraindications and precautions
Indicate when to refer individuals to their licensed healthcare provider for diagnosis and treatment
Discuss and describe the body’s structure and function in a healthy state
Understand and identify the mechanical and biochemical changes caused by a variety of diseases or imbalances to be able to address system imbalances and provide education that individuals can use to restore wellness

Career Goals for the Diploma in Aromatherapy Master Aromatherapist (Dip. Aroma.) program:

  • Aromatherapist, Registered Aromatherapist (RA)
  • Aromatherapist, Aromatherapy Consultant, or Aromatologist
  • Aromatherapy Product Formulator & Manufacturer

Current Instructors: 

View all ACHS instructor bios, photos and courses taught online here.

Admissions Requirements:

Minimum of a high school diploma or equivalency and recommendation for admission by the ACHS Admissions Committee.

Tuition and Fees:

To estimate the program tuition and fees, click on the required course name to view each Total Course Price. Information is also provided in the Program Fact Sheet.

Required Sequence:

The required course sequence for this program is published in the ACHS Program Catalog available to download online here.


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