Iodine, Evolution and the Thyroid

Useful - Practical - Essential

Get a big-picture view of the role and function of the thyroid, how it evolved and why iodine is so essential.
"...gain a better understanding of how iodine is needed." 
" impressed by the breadth of your presentation." 
"...always so pleased with everything new that I learn."

Iodine is Essential!

This is an Intermediate-level class. Students of all levels are welcome. This class is for anyone - not just herbalists - interested in iodine, evolution, the thyroid, and the naturally existing support and remedies for thyroid and related health conditions.

Iodine was the first antiseptic and anti-inflammatory substance - absorbed by primitive creatures from the sea around them. The thyroid was developed by higher animals, not to regulate heat, but to continue to supply these functions. Finally, warm-blooded animals developed thyroid hormones (T4 and T3), the function of which was to regulate heat production in cells.

Humans discovered iodine, and it was recognized as essential to human health to prevent hypothyroidism & goiters and used as an antiseptic and antibacterial. Many organs other than the thyroid require iodine, particularly the breasts - breast cysts and diseases can be caused by a lack - and the brain, which is protected from some kinds of stroke by iodine released into the carotid sinus. We see the importance of iodine in a wide arena in the body.

This class addresses:

  • Why iodine is very important for breast tissue
  • Why fluoride, chlorine, and bromine wreak havoc on this system and how to counteract the effects
  • How low iodine, Hashimoto's, and Hypothyroid are similar but different
  • How to palpate the thyroid
  • How to do a simple iodine content test of foods
  • Comparisons of the various iodine tests for the body
  • Goiter
  • Hyaluronic acid and restoring cartilaginous tissue
  • Herbs and foods to provide iodine and improve uptake
  • and more!


Support Materials

115 pages on iodine by Matthew Wood
(not downloadable) 

Support Materials

28 pages on hormonal and reproductive imbalance
(not downloadable) 


2 hours of teaching


Certificate included
(see more below)

Pay Once = One Year Access

1 year to view and review content, ask questions and discuss

This is for you if you...

want a holistic and Traditional Western Herbal perspective of the thyroid along with the insight from teachers with decades of experience.
desire to add vital information on nutrition to your herbal repertoire.
value learning the background, the evolution of how things came to be for greater perspective.

Upon completion, you will...

feel more confident in your ability to get to the bottom of complicated and seemingly mysterious health conditions.
understand why there is a correlation between thyroid and breast conditions.
be able to holistically help yourself, friends, family and clients with common conditions related to thyroid.


Matthew Wood, MS

Matthew Wood has been a practicing herbalist for over forty years. He is an internationally known
teacher and author with more than ten books to his credit, including The Book of Herbal Wisdom, 
The Earthwise Herbals, Holistic Medicine and the Extracellular Matrix, and A Shamanic Herbal 
(July 2024). Matthew has an MSc in herbal medicine from the Scottish School of Herbal Medicine 
(accredited, U. of Wales). He lives in the Midwest. 

Phyllis D. Light, MA 

As 4th generation herbalist, Phyllis started with lessons from her grandmother who taught from her Creek/Cherokee heritage. Phyllis has studied and worked with herbs, foods, and other healing techniques for 30+ years. She is the author of Southern Folk Medicine and co-author of Traditional Western Herbalism Pulse Evaluation.

Certificate Included

  • How to Get a Certificate

    • Complete course materials
    • Pass the test with a grade of 70% or better
    • Save or print your certificate!

    Available with subscription and individual course purchases.

  • Accreditation hours

    This course is a total of 4 accredited hours
    • 3 hours Basic Human Sciences
    • 1 hour Nutrition and Medical Terminology

    *Please check with your accrediting agency whether they will accept accredited hours or certificates from the Matthew Wood Institute of Herbalism
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Iodine, Evolution and the Thyroid

Learn why one student says. "I learned more about my own thyroid condition in this one 2-hour class than from any other source over years of inquiry."

Check out our certificate courses!