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Do you know how to determine whether a given dose is for a chronic use vs an acute use? Did you know that sensitization is not a reaction caused by undiluted EO use? Do you know when it would be acceptable or even desirable to use a phototoxic oil or an irritating oil above the minimum dilutions typically recommended? If you answered “no” to any of these questions, it’s time to master the skills covered in the AromaToxicology continuing education course.

Toxicology is the study of the adverse effects of chemicals. AromaToxicology is the study of the adverse effects of essential oil chemicals. These chemicals within the oils are often healing, but can act as toxins in the body, under the right conditions. Just as clinical trials discover the beneficial effects of oils, the field of toxicology explores the risks associated with essential oil use. Both fields are equally important when it comes to accurate dosing and dispensing. Arriving at the correct dose requires a mastery of both clinical trials and toxicology, because safely achieving efficacy only occurs when these two intersect.

This short course explores the distinction when an EO chemical heals and when it harms, empowering you to achieve greater precision in essential oil selection and dosing.


This 4- week course is ideal for both professional aromatherapists and for aromatherapy enthusiasts alike. If you have become frustrated trying to determine how to dose essential oils correctly, this course simplifies the process. (Note: This is a strongly recommended pre-requisite for our Dosing and Dispensing CEU course.)

If you are a current FSIHS student in the DipDSS, CertAro, or DipAS program, this material is all covered in your required coursework. If you are an FSIHS graduate, this course will provide extra practice with dosing calculations and review what you have already studied.



  • Acute vs Chronic Toxicity
  • Dose-Time Relationship
  • Influence of Route of Exposure on Toxicity
  • Sensitization & Photosensitization
  • Environmental Exposures vs Medical Exposures
  • Carcinogenesis, Mutagenesis, & Reproductive Toxicity
  • ED50, TD50, & LD50, and the Significance of Each
  • No-Effect Levels & Thresholds
  • Bioaccumulation
  • Toxicological Epidemiology


Each week concludes with a formal assessment. Upon successful completion of all four assessments, you will be issued a certificate of completion. The certificate of completion specifies that you have successfully completed 20 contact hours of college continuing education.

Because FSIHS is an approved school with NAHA and the NBHWC, CEUs can be used for professional requirements for both aromatherapists and health and wellness coaches. As a fully authorized postsecondary institution, FSIHS CEUs can also be used to renew other professional memberships and licenses.


Registration includes access to the FSIHS Canvas learning management (LMS) system for the delivery of course content. The Canvas system opens to students the midday on the first day of class. Access continues for two weeks after the course ends to allow time for review. Within the Canvas LMS, students will be able to access the course downloads, the live stream video, the question and answer forum, and the required assessments. This system requires high speed internet and intermediate internet skills of each participant.


Full registration is $490. This fee covers all 4 weeks of the course, instructor support, and downloads of key clinical studies that are used in the course discussion and assignments. This also covers graded assessments (1 per week) and the opportunity to earn a CEU certificate upon successful completion.

The course is also available to audit. Auditing participants do not complete assessments, do not receive grades, and are not eligible to earn a CEU certificate. The cost to audit the course is $290.

The total fee is due at the time of registration to reserve your seat in the course. Applicants must be 18 years of age or older and have completed a minimum of high school or the equivalent. Verification of eligibility must be received before the first day of the course.  Full refunds are available until 14 days prior to the event. Cancellations made between more than 7 days but less than 14 days before the event are refundable at 50%. Refunds are not granted for cancellations within a week of the event.



The Franklin Institute of Wellness is proud to be fully authorized to grant college certificates and degrees by the Tennessee Higher Education Commission. This commission oversees college education and ensures that diplomas and certificates issued by the FIW are recognized as legitimate college credentials nationwide.

The Franklin School of Integrative Health Sciences is also an approved school by the National Association for Holistic Aromatherapy and is the only NAHA approved school with a PhD researcher directing the program. FSIHS is also a recognized CEU provider for Board Certified Health and Wellness Coaches (NBC-HWCs) CE #100102.