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:
- Differentiate Histamine Intolerance from MCAS using symptom patterns and targeted biomarkers (tryptase, DAO, methylation markers) to guide your nutrition care plans.
- 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.
- Build Tiered Supplement Protocols appropriate for nutrition practice, confidently using foundational supports (Quercetin, Vitamin C, DAO) and knowing when to collaborate on advanced compounds.
- Identify and Address Root Causes including gut imbalances, hormonal influences, methylation issues, and environmental triggers.
- 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:
- Differentiate histamine intolerance (HIT), Mast Cell Activation Syndrome (MCAS),
mastocytosis, and secondary mast cell activation using clinical patterns, biochemical mechanisms, and laboratory markers. - Explain the core pathways of histamine production, degradation, and mast cell activation, including DAO, HNMT, methylation, FcεRI signaling, and inflammatory mediators.
- Identify root contributors to mast cell dysregulation, including genetics, gut dysfunction, infections, hormonal imbalance, toxic burden, oxidative stress, and chronic stress physiology.
- Interpret relevant laboratory and functional markers to support assessment and individualized clinical decision-making.
- Develop personalized intervention strategies incorporating dietary modification, trigger reduction, mast cell stabilization, nutraceutical support, and circadian/stress regulation.
- Construct a phased, systems-based treatment plan that prioritizes stabilization, reduces inflammatory burden, and restores long-term immune regulation.
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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.

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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!
OR
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
