# Nutrition Detective Network

This is the Substack of Dr. Garrett Smith, the Nutrition Detective. Dr. Smith is the foremost expert on the worldwide epidemics of nickel toxicity, "vitamin" A toxicity, and cholestasis, and how to repair our bodies from this damage.

Page: <https://rssamplifier.com/drgarrettsmith-substack-com>  
Feed: <https://rssamplifier.com/drgarrettsmith-substack-com.md>

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## [“Vitamin A Deficiency” Doesn’t Exist?!? The Research Says We’ve Been Blaming the Wrong Thing](https://drgarrettsmith.substack.com/p/vitamin-a-deficiency-doesnt-exist)

_2026-08-13 · Dr. Garrett Smith_

Why Low Blood Retinol, “vitamin" A Deficiency” Symptoms, and the Research on Protein, Zinc, Taurine, and Liver Storage Tell a Very Different Story

## [Only dead things are put on ice](https://drgarrettsmith.substack.com/p/only-dead-things-are-put-on-ice)

_2026-07-31 · Dr. Garrett Smith_

The following is a tragic tale…

## [When “vitamin” A deficiency isn’t the answer](https://drgarrettsmith.substack.com/p/when-vitamin-a-deficiency-isnt-the-94b)

_2026-07-30 · Dr. Garrett Smith_

The symptoms point somewhere else

## [What medical school didn’t prepare me for](https://drgarrettsmith.substack.com/p/what-medical-school-didnt-prepare)

_2026-07-29 · Dr. Garrett Smith_

I did everything “right,” but I was still wrong

## [This part of the healing journey often gets missed](https://drgarrettsmith.substack.com/p/this-part-of-the-healing-journey)

_2026-07-28 · Dr. Garrett Smith_

There’s something people don’t tell you when you get diagnosed with Crohn’s disease:

## [The seediness of black seed oil](https://drgarrettsmith.substack.com/p/the-seediness-of-black-seed-oil)

_2026-07-27 · Dr. Garrett Smith_

It’s been called “the cure for everything except death.”

## [Your body’s toxic traffic jam, and the gentle fix](https://drgarrettsmith.substack.com/p/your-bodys-toxic-traffic-jam-and)

_2026-07-26 · Dr. Garrett Smith_

Have you ever felt like your health progress just… stopped?

## [The Truth About Niacin — What They’re NOT Telling You](https://drgarrettsmith.substack.com/p/the-truth-about-niacin-what-theyre)

_2026-07-25 · Dr. Garrett Smith_

If you’ve ever heard about niacin supplements, chances are you’ve also heard about the “flush.”

## [If you can’t quit coffee, cigs, or alcohol, this is for you](https://drgarrettsmith.substack.com/p/if-you-cant-quit-coffee-cigs-or-alcohol)

_2026-07-24 · Dr. Garrett Smith_

Tackling addiction is tricky.

## [Find it on Amazon (Sponsored)](https://crawlproof.com/a/z7Lf9rnPMP28)

_2026-07-24 · **Sponsored**_

Open the Amazon product listing to see details and availability

## [Doing everything right and still feel off?](https://drgarrettsmith.substack.com/p/doing-everything-right-and-still)

_2026-07-23 · Dr. Garrett Smith_

Your effort isn't the problem