Aromatherapy Science Online


Aromatherapy has become an increasingly popular modality to support wellness, particularly in an integrative healthcare setting due to its ability to enhance the quality of life for a wide range of clients. This graduate-level survey course provides students with an in-depth analysis of the fundamental principles of aromatherapy, aromatology, and aromacology. We will examine the major categories of aromatherapy, aromatology, and aromacology including definitions, selected proven and unproven effects of essential oils citing research literature, historical perspectives, essential oil constituents and bioactivity, the science of smell and psychological effects, safety issues, and clinical studies. Plant photographs for identification and interactive exercises help to bring the concepts to life for visually-oriented and kinesthetic learners.

Learning Outcomes

  • Compare modern and historic aromatherapy definitions, philosophies, practices, and methods of essential oil extraction.

  • Summarize key information from peer-reviewed aromatherapy research focused on essential oil therapeutic actions, mechanisms, clinical applications, or industrial uses.

  • Describe the sensory properties (organoleptic assessment), therapeutic uses, methods of extraction, key constituents, and example formulations.

  • Explain the therapeutic effects of essential oils via physiological and psychological mechanisms, including olfaction and psychoneuroimmunology.

  • Evaluate the potential role of aromatherapy for special populations including gynecology and obstetrics.

  • Discuss key essential oil and aromatherapy safety concerns and best practices, including differences in regulatory requirements internationally.

  • Evaluate industrial uses of essential oils, including commercial flavor and fragrance.

More details

Required Materials (Course Pack)

  • ACHS eTextbook: Petersen, D. (2020). Aromatherapy Materia Medica: Essential Oil Monographs (20th Edition). Portland, OR: American College of Healthcare Sciences. (Optional: Printed copy available for an additional fee)
  • AROMA 501 Practical Lab Kit:
    • This practical lab kit contains the following certified organic or sustainably wildcrafted essential oils:
      • Bergamot Citrus aurantium var bergamia
      • Chamomile Roman Chamaemelum nobile
      • Clary Sage Salvia sclarea
      • Eucalyptus Globulus Eucalyptus globulus
      • Eucalyptus smithii Eucalyptus smithii
      • Lavandin Lavandula intermedia
      • Lavender Lavandula angustifolia
      • Lemon Citrus limonum,
      • Lemon Eucalyptus Eucalyptus citriodora, 
      • Rosemary Rosmarinus officinalis
      • Sweet Orange Citrus sinensis, 
      • Tea Tree Australia Melaleuca alternifolia
      • Tea Tree New Zealand Leptospermum scoparium,
      • Ylang Ylang Cananga odorata


      This practical lab kit also contains the following raw ingredients and practical lab supplies:

      • 16 oz Sweet Almond Oil (may contain multiple bottles to total 16oz)
      •  25 ml glass beaker & glass stirring rod, 3 ml disposable pipettes (Qty 15), Perfume Testing Strips (Qty 26), 5 ml amber bottle
      • Laminated Essential Oil Chart
  • Online Materials and Library Resources (OMLR)

Required Textbooks: 

View the required textbooks for this class, including ISBN, edition, and retail price, by visiting our Required Textbooks page.

Total Course Price:

View the total course price including tuition, fees, course materials, and shipping online here.


Last updated: 3/2/23

Embrace your tomorrow.
Request information today.

We are committed to protecting your privacy.  For more information view our Privacy Policy.

Current Instructors:

View all ACHS instructors, including bios, photos, and courses taught.

Admissions Requirements:

Candidates must possess a baccalaureate degree or higher from an institution accredited by an agency recognized by the US Department of Education. Candidates must submit official transcripts directly from the issuing institution along with one professional letter of recommendation. All applicants must be recommended for admission by the ACHS Admissions Committee.

Total Course Price:

View the total course price including tuition, fees, course materials, and shipping.

Industry Leaders

ACHS Partnerships & Affiliations

logo deac
logo mulondon certifications
logo b corp
logo OBM 100 best green logo