Health Literate

Health Literate

Field Notes #06: Heavy Metals in the Herbal Supply

how contaminated soil ends up in your supplements, and what the research says about reducing the burden

Agy | Health Literate's avatar
Agy | Health Literate
Apr 21, 2026
∙ Paid

A quick note before we start:

Field Notes are usually a paid-subscriber feature, but I am unlocking this one for everyone. I am rolling out a new format on this publication, presentations and lectures alongside the written work, and I wanted all of you to get a feel for it before deciding whether it is something you would want to subscribe to.

The presentation embedded at the end of this post was originally built for a graduate assignment in my Environmental Nutrition coursework, and it pairs directly with what I am walking through below.

In this issue:

  • Why so many herbal supplements are carrying heavy metals into clinical practice

  • How cadmium and lead create nutrient gaps even when the diet looks adequate

  • Which dietary compounds help the body clear what makes it through

  • A heads-up on the presentation embedded below for anyone who wants the clinical framework in more depth

Soil is the start of the supply chain. Whatever lives in it, minerals, microbes, metals, herbicide residue, ends up in …

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