Aromatherapy · Programs compared
By Valérie Fabre, Founder & Director, Harmonika Institute · Updated September 2026 · Facts as published by each provider
Aromatherapy certifications in the U.S. follow association standards rather than state licenses: NAHA Level 1 requires 50 hours and Level 2 requires 200 hours. The programs compared cost from $1,450 (Aromatic Studies, 500 hours) to an estimated $11,547 (ACHS). Most serious programs are online and self-paced. Choose by NAHA level, number of case studies, live feedback and budget.
U.S. median across 5 leading providers: $1,760 for 33 days of class. See the 2026 cost data.
| Criteria | Aromahead Institute | School for Aromatic Studies (Aromatic Scholars) | American College of Healthcare Sciences (ACHS) | Harmonika Institute |
|---|---|---|---|---|
| Credential | Certified Aromatherapist (NAHA Level 2 Certified Professional Aromatherapist; AIA and IFPA approved) | Certified Clinical Aromatherapist (CCA), Certified Aromatherapy Practitioner (CAP) or Certified Holistic Aromatherapy Practitioner (CHAP); eligible with NAHA, AIA and IFPA | Certificate in Aromatherapy; follows the NAHA Level II curriculum, aligned with AIA, prepares for the ARC exam | Certified Aromatherapy Practitioner (CARP) |
| Format | Online, self-paced, with unlimited lifetime access to materials | Online, self-paced; average completion 10 to 12 months | Online | 100% live online |
| Teaching time | 235 hours, 7 lessons | 500 hours plus 150 hours of anatomy and physiology; prerequisite Level 1 Foundations (50+ hours) | 16 credits (hours not published on the page consulted), plus anatomy and physiology for non-healthcare professionals | 6 days (48 hours of class) |
| Tuition | $1,795 (Specialist option); $2,395 (Pathway 3, with anatomy and physiology, 20 case studies, paper and exams); $4,495 (Scholars Program, Certified Clinical Aromatherapist path) | $1,450 in one payment (2 x $750 or 3 x $525); Level 1 price not published on the page consulted | Estimated $11,547 (registration $200, tuition $6,960, books and supplies $4,337, graduation $50) | $2,000 |
| Accreditation | NAHA Level 2, AIA and IFPA approved (as published) | Structure aligned with NAHA levels; eligibility with NAHA, AIA and IFPA; 78 NCBTMB continuing education hours (as published) | Institution accredited by DEAC; NAHA Level II compliant; school reports an 88% ARC exam pass rate for 2019-2023 graduates (as published) | Private certification, not a state license |
| Best for | Self-paced learners who want hands-on blending and a dedicated instructor reviewing each case study | Learners who want a large oil repertoire at low tuition, and massage therapists seeking CE hours | Students who want academic credits, DEAC accreditation and preparation for the national ARC exam | Wellness practitioners who want live online blending practice and a chemistry-based Aromatherapy foundation |
Provider details as published on their websites in September 2026. Prices and schedules change: check with each provider.
All three programs teach the chemistry of essential oils, the basis for linking chemical families to properties and precautions. Aromahead includes a chemistry lesson, Aromatic Studies has an Aromatic Chemistry module with pharmacokinetics, and ACHS covers oil chemistry and how constituents act in AROMA 203.
Each provider expects anatomy and physiology from students without a healthcare background. Aromatic Studies requires 150 hours, ACHS includes dedicated anatomy and physiology courses for non-healthcare professionals, and Aromahead includes an anatomy and physiology course in its Pathway 3 option.
Real case studies are part of each path: 20 at Aromahead and 14 at Aromatic Studies, while ACHS assesses students through case studies, literature reviews and practical exercises. For reference, NAHA's minimum is 5 case studies at Level 1 and 10 at Level 2.
Students make blends and products throughout. Aromahead students create more than 40 blends and products at home, Aromatic Studies teaches skin formulation, and ACHS covers formulation for personal care, perfumery, cosmetics and soap making, with a lab kit of essential oils provided.
Each program adds written and professional components. Aromahead requires an 8 to 10 page paper, Aromatic Studies a research paper and ACHS literature reviews. Business and legal content appears as business practices at Aromahead, Entrepreneurial Skills at ACHS and legal considerations at Aromatic Studies.
ACHS is the only provider of the three within a DEAC-accredited academic framework, with credits and preparation for the ARC national exam. Aromahead publishes NAHA Level 2, AIA and IFPA approval. Aromatic Studies aligns its structure with NAHA levels and lists eligibility with NAHA, AIA and IFPA.
Aromatic Studies publishes the largest repertoire, with 81 essential oil monographs organized by botanical family. Aromahead profiles 48 essential oils. ACHS does not publish the number of oils studied on its certificate page. For reference, NAHA's standard is 20 oils at Level 1 and 40 at Level 2.
Aromahead assigns a professional aromatherapist as case study instructor, who reads every report and gives personal feedback. Aromatic Studies includes guest teaching by Juliet Blankespoor on botany and herbalism, plus 78 NCBTMB continuing education hours. ACHS uses varied assessments within credit-based courses and provides a lab kit.
As published in September 2026, Aromatic Studies charges $1,450 for its 500-hour program, with its Level 1 prerequisite priced separately. Aromahead lists $1,795 to $4,495 depending on the option chosen. ACHS estimates $11,547 for its certificate, including $4,337 in books and supplies.
Decide whether you want NAHA Level 1 (50 hours, 20 oils, 5 case studies), Level 2 (200 hours, 40 oils, 10 case studies) or a clinical path. Harmonika Institute's CARP is a private certification that is not approved by NAHA or other outside bodies.
Aromahead and Aromatic Studies are self-paced and ACHS is fully online, which suits independent learners. If you learn best with real-time correction of blends and dilutions, look for live classes. Harmonika Institute's CARP is taught live online, with blends made and corrected on camera.
Check how the program covers dilution, sensitization, photosensitivity, pregnancy, children and drug interactions. Ask which safety reference text is used and how the program handles internal use, which varies between schools and traditions.
Case studies are where knowledge meets real people. Compare the number required (20 at Aromahead, 14 at Aromatic Studies, five in Harmonika Institute's CARP) and ask who reads them and how feedback is delivered.
Tuition is only part of the cost. ACHS's estimate includes $4,337 in books and supplies. Ask whether oils, carrier oils and bottles are included or bought separately, and whether any national exam fee applies.
As published in September 2026, Aromatic Studies charges $1,450 for its 500-hour Aromatic Scholars program. Aromahead Institute lists $1,795 for its Specialist option, $2,395 for Pathway 3 and $4,495 for its Scholars Program. ACHS estimates $11,547 for its Certificate in Aromatherapy, books and supplies included.
NAHA sets 50 hours for Level 1 and 200 cumulative hours for Level 2. Aromahead's certification lists 235 hours in 7 lessons. Aromatic Studies lists 500 hours plus 150 hours of anatomy and physiology, with an average completion of 10 to 12 months. ACHS lists 16 credits without publishing hours on its certificate page.
Yes. The serious U.S. market is almost entirely online. Aromahead and Aromatic Studies are self-paced, and ACHS teaches fully online. Harmonika Institute's CARP is taught live online, with a kit of 30 oils that arrives before the first day and blends made and checked on camera.
No state license governs aromatherapy. Credibility comes from professional association standards: NAHA, AIA and IFPA recognize education levels, and the Aromatherapy Registration Council offers an independent national exam. Harmonika Institute's CARP is a private certification, not a license, and is not accredited by outside bodies.
NAHA Level 1 requires at least 50 hours, 20 oils, 5 case studies and an exam. Level 2 requires 200 cumulative hours, 40 oils, 10 case studies, a 5 to 10 page paper and an exam. Aromahead's certification is approved at Level 2, and ACHS follows the Level II curriculum.
Common topics include essential oil chemistry, oil monographs, safety and dilution, anatomy and physiology, blending and formulation, case studies and business practice. Aromatic Studies adds skin and mind modules, ACHS covers perfumery, cosmetics and soap making, and Aromahead centers on blends and products made at home.
We selected three schools approved by or aligned with NAHA Level 2 that publish a detailed program with modules, hours, oils, case studies and exams: Aromahead Institute, Aromatic Studies and ACHS, the DEAC-accredited option. A school whose program was under review and courses without a published educational standard were set aside. Data comes from each provider's website, collected in September 2026. Prices change, so check with each provider before enrolling.
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6 days of live online teaching, a cohort of 15, $2,000 tuition.