The Vitamin D Debacle

Confusion seems to be the norm, am I right?

If you're like most, you're confused and/or overwhelmed by all the information about vitamin D. Trust me, I get it. I was super confused as well. There are so much contradictory information and messages about what vitamin D is (a nutrient or a hormone?), how much we should be getting, the ideal blood level, and its impact on health.

Hell, even as a clinician, there's heaps of confusion among my healthcare coworkers about vitamin D metabolism and the different vitamin D metabolites, all of which are used interchangeably - big oopsy. And this doesn't even touch on the fear and panic dialogue about "toxicity".

Here's the thing, if you don't have a solid, foundational grasp on vitamin D you won't be able to even start to have meaningful conversations with your friends, peers, patients/clients, decision makers and coworkers about this amazing molecule and what it can offer in the way of health. With the right information, your confusion will fade and your knowledge and confidence will soar.

I'm here to tell you, there's a way out of the weeds

After taking my course, Vitamin D Essentials, you will understand all that you need to know about vitamin D.

You will be well-versed and a PRO because you'll know what the different vitamin D metabolites are, the part they play in metabolic function, vitamin D's role in health and disease, what ideal blood levels probably should be, what the current research says, and how to get the most from vitamin D by leveraging both food and supplements.

The Solution?

Vitamin D Essentials for Professionals: The Curriculum

Module One - Vitamin D Fundamentals

After this module, you'll understand vitamin D nomenclature, it's endocrine, paracrine, intracrine, and autocrine functions so that you can appreciate vitamin D's role beyond bone health.

  • Vitamin D's Early History
  • The 3 Faces of Vitamin D
  • Nutrient or Hormone?
  • Vitamin D3 Production
  • D3 vs D2
  • Vitamin D Beyond Bones
  • Pharmacokinetic Features of Vitamin D


Module Two - The Central Role of the Sun

Here you'll understand how the sun played a pivotal role in our gene selection and ancestral health and how that likely applies to today but is either overlooked or underappreciated. You'll be able to use this knowledge to confidently leverage vitamin D for better health

  • African Grasslands (Wetlands) and Natural Selection for Vitamin D Production
  • Skin Pigmentation Theory
  • Clues for Natural Vitamin D Levels
  • The Impact of Complexion and Seasonality


Module Three - Vitamin D in Health and Disease

This module reviews much of the current research on vitamin D's impact on several health conditions. Different definitions of deficiency will be reviewed, as will the possible implications of low vitamin D.

  • Proposed Health Implications of Low Vitamin D
  • Proposed Serum Vitamin D Levels
  • Current Limitations of Vitamin D Studies
  • Bolus versus Daily Dosing
  • Bone & dental health
  • Depression & cognition
  • Cancer
  • Pre-diabetes, Diabetes & Cardiovascular
  • Falls Risks
  • Respiratory Infections
  • All-Cause Mortality


Module Four- Synergistic Nutrients

After this module, you'll be able to identify four key nutrients that support vitamin D's metabolism and why you should consider them for your own health and, for the health of your patients and clients. The impact of other nutrients on serum vitamin D levels will be covered too.

  • Vitamin K2
  • Vitamin A
  • Magnesium
  • Zinc
  • Impact of Nutrient Intake on Vitamin D Levels (magnesium, vitamins K2, B12, C, B6, calcium)


Module Five - Food & Supplements

This module reviews food sources of vitamin D, typical intake from diet, the amount of vitamin D currently permitted in supplements, the best formulations, and the best way to take supplements.

  • Food Sources of Vitamin D
  • Typical Dietary Intakes
  • Legislation: Canada vs USA
  • Different Vitamin D Formulations
  • Factors Affecting Vitamin D Absorption
  • Available Dosages


Module Six - Leveraging Vitamin D to Improve Health

In this lesson, you'll learn about the signs & symptoms of vitamin D deficiency, when to use supplements, and when not to. You'll be confident, armed with the necessary information needed to consider recommending specific dosages above the RDA to achieve therapeutic levels of vitamin D, and more.

  • Risk Factors for, and Symptoms of Deficiency
  • Contraindications for Supplements
  • Drug-Vitamin D Interactions
  • The Role of Testing
  • Current DRIs
  • Vitamin D Safety/Toxicity
  • Proposal for New RDA


Conclusions and Next Steps

What's Included

  • List of References

    You'll get a full list of dozens of references from peer-reviewed journals that are cited throughout the course so that you'll have the best information at your finger tips.

  • Supporting Handouts

    You'll receive a series of handouts that summarize the more important points that can be used when speaking with friends, family, peers, and decision-makers. There will also be handouts that can be used with patients.


Course creator and instructor

Doug Cook MHSc

Doug is an Integrative & Functional Nutritionist and Registered Dietitian. He has a mixed bag with respect to his practice ranging from clinical nutrition to writing for the public, patients, and other health professionals, program development, private practice, and has had a variety of experience in media including TV, radio, and print. 

Doug is very passionate about nutrition and believes that a diet based on nutrient-dense, minimally processed whole foods along with targeted supplementation are the foundation of healing, restoring, and maintaining health.  

Doug is known for not being satisfied with toeing the party line nor blindly following conventional wisdom. He likes to challenge himself by looking deeper into long-standing orthodoxy, considering other points of view even if unpopular, and to challenge the assumptions of the professional in order to know more completely for himself, so that he can provide a more balanced view. 

He is the co-author of: 

Nutrition for Canadians for Dummies 
The Complete Leaky Gut Health & Diet Book 
175 Best Superfood Blender Recipes Using Your Nutribullet

Doug Cook, MHSc 

Host: Pursuit of Health Podcast


  • When does the course start and finish?

    The course starts as soon as you purchase it! It is a completely self-paced online course - you decide when you start and when you finish.

  • How long do I have access to the course?

    Access is lifelong. Each enrolment covers access for ONE person. After enrolling, you have unlimited access to this course for as long as you like.

  • Are there refunds?

    Due to the digital nature of the material, and because this is an educational and informational course and not a program that guarantees results or a particular outcome, refunds will not be issued after purchasing. However, if you're unsure about purchasing the course - contact us! or 416-413-9095

  • Is This Course Considered Training?

    In a word no. This course is for education, and informational purposes only.

  • Disclaimer

    The information in this course does not constitute, nor is it a substitute for medical advice. If you've been experiencing any health issues, don't ignore them. You should consult your doctor or other health practitioners before adopting changes that might impact your health or current health condition or current medication use.

Your Investment

For the initial launch of Vitamin D Essentials, I'm offering the course at the introductory price of $97.

Are you ready to expand your knowledge, understanding, and confidence about all things Vitamin D? Enroll today and continue with YOUR NUTRITION EDUCATION