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Browse 100+ WHY products — phone cases, mugs, water bottles, apparel, and Dr. Z's functional medicine books. Gear for people who keep asking why.

110 products

iPhone® You're not dramatic. You're undiagnosed.

$12.50

iPhone® You're not dramatic. You're undiagnosed.

$12.50

Samsung® From Silenced to Certain

$12.50

Ask questions. Demand answers Drink coffee.

$9.50

Ask Why.

$32.50

Believe Patients

$27.00

Believe patients. Stainless steel water bottle with a straw lid

$28.00

Belly Buddy

Currently unavailable

Belly Buffer

$51.00

Belly Calm

$63.90

Belly Ease

$55.90

Belly Restore

$63.90

Black Glossy Mug

$10.50

Calm Down

Currently unavailable

Cease Fire

$30.80

Chronic Illness Deserves Chronic Attention.

$43.00

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Books By Dr. Z

The Character Code System

How to Read a Client from Across the Room (McGraw-Hill, 2012) — Bronze Axiom Business Book Award winner. Introduced The Character Code System.

Buy on Amazon

Middle-Aged Mama in a Muumuu

Middle-Aged Mama in a Muumuu — A marketing and business playbook for practitioners.

Buy on Amazon

A Practitioner's Guide to Mastering Functional Medicine Lab Values — A four-volume clinical lab textbook series, each volume over 500 pages. The series is used as required reading in other functional medicine practitioner training programs outside TDZ-FMA.