Your own tests without a doctor check-
Thyroid:
T3 reverse, T3 Free, T4 Free, TPO, TSH and more like iron, Vitamin D, Cholesterol and sugar
https:ultalabtests.com/keystobasichealth
or
keys2basichealth.com
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These books are also available from Amazon, some are used, and are selling for less.
You can find one here:
It is eligible for free shipping when you add another product totaling $25