Welcome to Essence of Thyme College of Holistic Studies

Our Advanced Aromatherapy Practitioner Program

Comprehensive and evidence-based 600-hour Advanced Aromatherapy Certification Program. Developed and taught by Colleen Thompson - Registered Aromatherapist with over 20 years of experience in the fields of aromatherapy and adult education, and by Dr. Kelly Ablard - Registered Aromatherapist Chemical Ecologist and Zoologist with over 20 years of experience in the fields of scientific research, animal behaviour and aromatic plant conservation.

Highlights of Essence of Thyme College of Holistic Studies:

  • Distance learning allows you to learn in the comfort of your home, and at your own pace wherever you are in the world.
  • AT101 covers 44 essential oils, 21 carriers, 5 hydrosols (300 hours in length; 12 months)
  • AT201 covers 47 essential oils, 16 carrier oils, 6 hydrosols (300 hours in length; 12 months)
  • Live orientation for Modules 1 – 5 when you begin the course.
  • Flexible, accessible and knowledgeable instructors to answer your questions.
  • One-on-one tutoring at no additional cost.
  • Case study and research mentors available to assist you.
  • Lab Aroma annual subscription for only $75.00.
  • Monthly live lectures to keep you up to date.
  • Talks by industry experts and guest speakers in the fields of Clinical Aromatherapy, Chemistry, Evidence-Based Research, Product Formulation Safety, Animal Aromatherapy and Aromatherapy and Beauty.
  • Partners in Herbal Education with United Plant Savers.
  • Special offerings for Continuing Education Credits.
  • Student forum.
  • A wealth of resource information on the student login section of the website.
  • Graduates of the EOT program have lifetime access to all educational resources.

Contact us today at support@essenceofthyme.com to begin right away!!!

Professional Recognition

Our courses are recognized by three Professional Aromatherapy Associations in Canada and the US:

Accredited by:


Course Recognition

The Essence of Thyme College of Holistic Studies is the only program that is recognized by all four Professional Aromatherapy Associations:

  • British Columbia Alliance of Aromatherapy – Registered Aromatherapist®; RA®; Essential Oil Therapist®: EOT®
  • The Alliance of International Aromatherapists – Advanced Aromatherapy Practitioner (formerly Clinical Aromatherapist), Level Three
  • The National Association for Holistic Aromatherapy – Clinical Aromatherapist, Level Three
  • Approved for Continuing Education Units (CEU's) with the Massage Therapy Association of Manitoba Inc.
  • Approved for 6 Continuing Education Credits (CEC's) by the Remedial Massage Therapists Association.

Some of Our Fabulous Students



Last year in January I saw an ad in Facebook: Professional Aromatherapy Course. I perked right up, I've always liked using essential oils but I definitely didn't use them properly. I purchased the course around May of 2017 and that determined my life and what direction it was going to go.

Continue Reading »


My journey into aromatherapy began a few years ago with a simple tattoo of great symbolism – “Breathe” – and with the hope to self-heal myself. When I was introduced to essential oils and experienced the healing powers of the plant world, I knew that I had found my passion. I decided to work towards aromatherapy certification and learn more about the healing properties of essential oils to intelligently and safely share my knowledge to help others. After 6 months of researching schools I chose the Essence of Thyme College of Holistic Studies and it was one of the best decisions that I made in my life.

Continue Reading »

Why should I take the Essence of Thyme Aromatherapy Certification Course?

Colleen has been involved in aromatherapy since 1995 and received her certification in 1998, as well as her Adult Education Diploma Program in 1997.  Her expertise in these areas is reflected in the course material which takes into consideration the various learning styles, the ease in which to navigate the manuals, the depth and clarity of information, and the user-friendly designed full-colour manuals.  Colleen has also owned several successful wholesale and retail aromatherapy businesses and brings this experience along with her background as a business owner, master formulator, spa practitioner, and instructor to the course material and to her students.

Kelly holds a Doctorate in Chemical Ecology, and has practiced aromatherapy since 2009. She has been teaching aromatherapy-based courses and volunteering as a Community Scientist for over a decade. She conducts most of her research in Peru on the endangered tree, rosewood (Aniba rosaeodora). She has published peer-reviewed papers on chemical communication, conservation/sustainability, animal behavior, and ethnobotany. As Director of the Airmid Institute, she also works to preserve and protect aromatic medicinal plants, and to teach aromatherapy to Indigenous plant-medicine healers. She has worked as a research analyst, created a college-based urban apothecary garden, and developed a sustainable urban gardening program. She has served on the advisory board of the Tisserand Institute, and on the Board of the British Columbia Alliance of Aromatherapy (BCAOA). She currently sits on the Board of the United Plant Savers, and actively presents her research on conservation and sustainability at aromatherapy conferences worldwide. Kelly has a passion for teaching, and for supporting and guiding people on their educational/aromatic journeys.