Confidently Identify and Manage Histamine Intolerance and MCAS in Your Nutrition Practice!

For RDNs, nutritionists, and integrative clinicians seeking to master complex cases. Get the assessment analytics, evidence-based biomarkers, diet strategies, and supplement frameworks to reduce guesswork and deliver lasting relief.

** On-Demand Training ***


Now Expanded to 32 Hours (10 more hours than our last series in 2023) plus bonus case studies now included!

The Problem: When Standard Advice Isn’t Enough

If you’re a nutrition professional, you’ve seen these clients:

  • They suffer from itching, hives, congestion, headaches, IBS, and fatigue, but allergy tests come back negative.
  • They are becoming food-phobic, stuck in a cycle of endless and overly restrictive elimination diets.
  • Antihistamines or basic low-histamine diets provide only partial relief, leaving them frustrated and without answers.

Misdiagnosis is common, and your patients are tired of temporary fixes. It’s time to move beyond symptom management and address the root cause.

Could it be Histamine Intolerance or Mast Cell Activation Syndrome (MCAS)?

Histamine intolerance and MCAS affect more of the population than we really know, with middle-aged women getting hit the hardest. Yet many cases remain undiagnosed or misattributed to other conditions. With growing research and clinical recognition, are you equipped with the latest evidence-based approaches?

Your Patients Need Help – That’s For Sure!

The Solution: Become a Go-To Expert!

This comprehensive course provides a systems-based understanding of histamine biology, histamine intolerance (HIT), and Mast Cell Activation Syndrome (MCAS). Participants explore enzymatic pathways, receptor signaling, genetic variability, methylation, detoxification, stress physiology, and gut–immune–brain interactions that drive mast cell dysregulation.

The course differentiates HIT from MCAS and related mast cell disorders while outlining practical diagnostic frameworks and laboratory considerations. Emphasis is placed on layered, individualized interventions—including dietary modification, lifestyle stabilization, targeted nutraceuticals, medical therapies, and advanced mast cell down-regulation strategies.

By integrating foundational science with clinical application, this program equips practitioners to confidently assess and manage complex, multisystem inflammatory presentations.

By the end of this intensive, you will be able to:

  1. Differentiate Histamine Intolerance from MCAS using symptom patterns and targeted biomarkers (tryptase, DAO, methylation markers) to guide your nutrition care plans.
  2. Implement Advanced Dietary Strategies that go beyond basic lists, focusing on what patients CAN eat, including DAO-boosting foods and managing cross-reactivities like oxalates and salicylates.
  3. Build Tiered Supplement Protocols appropriate for nutrition practice, confidently using foundational supports (Quercetin, Vitamin C, DAO) and knowing when to collaborate on advanced compounds.
  4. Identify and Address Root Causes including gut imbalances, hormonal influences, methylation issues, and environmental triggers.
  5. Navigate Complex Comorbidities like POTS, EDS, and biotoxin illness by understanding the neuroimmune-endocrine network.

From Restriction to Freedom

Give your Patients Lasting Relief They Deserve!

Course Curriculum & What You’ll Master:

  • Module 1: Foundations & Differentiation
    Classifications of histamine intolerance and Mast Cell Disorders. Key differences, causes, and how to assess them.
  • Module 2: Histamine Metabolism & Genetics
    Deep dive into the genetics influencing histamine pathways, including Hisapenia & Histadelia.
  • Module 3: Mast Cell Degranulation & Triggers
    Understand the triggers and mediators of mast cell degranulation and the connections to gut health, hormones, and stress.
  • Module 4: Methylation’s Connection to Histamine and MCAS
    Learn how your immune and even neurotransmitter balance is influenced by methylation.
  • Module 5: Assessment & Biomarkers
    Learn which specialty biomarkers to consider, how to interpret them, and how to use them to create targeted interv
  • Module 6: Advanced Dietary Strategies
    The most effective, patient-friendly diet protocols with an emphasis on food variety. Includes recipes and menu ideas.
  • Module 7: Supplements & Alternative Support
    A review of drug therapies to inform collaboration, plus evidence-based enzyme and dietary supplement protocols for maximum results.
  • Module 8: Case studies, Past and Present
    Bring your learning into practice: A great window into real patient cases displaying the identification and support of histamine and mast cell disorders.

Objectives:

  1. Differentiate histamine intolerance (HIT), Mast Cell Activation Syndrome (MCAS),
    mastocytosis, and secondary mast cell activation
    using clinical patterns, biochemical mechanisms, and laboratory markers.
  2. Explain the core pathways of histamine production, degradation, and mast cell activation, including DAO, HNMT, methylation, FcεRI signaling, and inflammatory mediators.
  3. Identify root contributors to mast cell dysregulation, including genetics, gut dysfunction, infections, hormonal imbalance, toxic burden, oxidative stress, and chronic stress physiology.
  4. Interpret relevant laboratory and functional markers to support assessment and individualized clinical decision-making.
  5. Develop personalized intervention strategies incorporating dietary modification, trigger reduction, mast cell stabilization, nutraceutical support, and circadian/stress regulation.
  6. Construct a phased, systems-based treatment plan that prioritizes stabilization, reduces inflammatory burden, and restores long-term immune regulation.

See What Others Are Saying

Kim Fox RDN, LD, CDE

After taking this histamine and MCAS course, I was blown away to see how in-depth this topic really is and how much I really didn’t know. Susan’s vast amount of knowledge, style of teaching, and desire to provide the most up-to-date information has provided me with the tools and confidence needed to further help my client in her healing process, along with many others who suffer with these disorders. Thank you, Susan!!!

Kim McConnell MS RDN LDN CLT

This training is filled with information and resources that can help healthcare practitioners become more empowered. It provides tools to help find the root cause as well. I feel more confident that I’ll leave no stone unturned to find answers for my clients with histamine and mast cell issues. As usual, Susan provides open communication during each session, whether it’s a question or a comment by participants. I highly recommend this training.

Annette Presley RDN, LD

Histamine intolerance and MCAS is so overlooked in conventional medicine, and this training was thorough and will definitely help elevate your effectiveness with clients and make you stand out from the crowd.

What You Get:

  • 32 Hours of Live, Interactive Webinars: Ask questions and engage with the material in real-time.
  • At least 4 In-depth Case Studies: displaying the assessment and support process for MCAS cases
  • Over 650 Content-Rich Slides: A comprehensive reference library.
  • Multiple Handouts & Resource Links: Dozens of practical tools for your clinic.
  • An 11-page done-for-you patient guide to understanding histamine & mast cell activation
  • 9-Month Access to Recordings: Viewable after each session so you never miss a thing.
  • Downloadable Files: All slides and handouts are yours to keep permanently.
  • Exclusive online Discussion Forum: Get your questions answered by instructors and peers between sessions.
  • Certificate of Completion: Showcase your advanced training.

See What Others Are Saying

Nazik Utuchian MPH RDN

This course has helped me understand the mystery of histamine and MACS, their impact on health, and how to properly treat it. Susan Allen is simply the most extraordinarily knowledgeable and caring teacher you can ever find. The passion she put into her classes is very contagious yet unmatchable!

Kate Loman RD, CDN

This course provided research-based info to improve my competency in helping clients with histamine problems. So many issues can be traced back to MCAS and histamine symptoms!

John Biggs BSc, NCP, OHP

The amount of information presented and referenced in this talk is extremely impressive! Very relevant, very valuable clinically…and directly applicable. I can help better help my patients with it immediately.

Susan Allen-Evenson, RDN, LDN, FMNS

Thirty years ago, one of my functional medicine mentors opened my eyes to nutrition beyond conventional training. This discovery transformed my career and life. Today, my clients regularly tell me, “No one else has ever told me this,” and “I feel better than I have in years!”

After building a 6-figure practice using IFMNT (Integrative and Functional Medical Nutrition Therapy) and mentoring countless interns and dietitians, in 2015, I founded Next Level Functional Nutrition. Through this international training initiative, my team of experts and I have taught thousands of practitioners to incorporate IFMNT into their practices.

My mission: elevate nutrition as the cornerstone of health while helping colleagues achieve the respect and success they deserve. As an award-winning author, speaker, and consultant to leading functional medicine centers, I’m proud to pioneer this global healthcare transformation.

Join me and discover how IFMNT can transform your practice and amplify your impact.

** On-Demand Training ***

Now 32 Hours of Content!

On-Demand Training Access
✓ 32 hours of training recorded from our most recent live series
✓ Access to our private discussion forum for questions and support
✓ 9-month access (extensions available)
Important: This on-demand training is not eligible for CE credit logging.
💡 Your purchase is credited toward enrollment in the next live offering of this same program—where updated content is provided and CPE hours may be logged. You would simply pay the difference in tuition at that time.
Why start now?
Get a head start on the material, begin applying what you learn immediately, and come into the live training prepared to go deeper, ask better questions, and get more value from the experience.

Have you taken a course with us before?

Welcome back! Email us to see if you qualify for an alumni discount for this expanded and updated content.

Have more questions about the course?

Our team is here to help. Ask a Program Specialist HERE