THE PURSER WELLNESS LIBRARY

Let’s explore “Vitamin A, retinol — lab reference”

A COURSE FOR YOUR CURIOSITYGetting to know your micronutrients

5 chapters, at your pace

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670 discoveries for your curiosity58 matching listings grouped; alternative sources stay available.

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Gene referenceSep 23, 2026

GSTM1

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…oose a supplement dose for you. Variant IDs in the teaching reference: rs1056806 Where the VARS Triad and MTHFR Daily fit If you are exploring homocysteine or cytokines, Dr. Purser may discuss MTHFR Daily and the VARS Triad: VARS Glutathion…

Gene referenceSep 23, 2026

GSTO1

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… teaching. The useful connection is between glutathione availability, oxidative workload and the larger detoxification network. A marker cannot identify a particular toxin exposure or prove that an antioxidant enzyme is absent. A question t…

Gene referenceSep 23, 2026

GSTP1

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…oose a supplement dose for you. Variant IDs in the teaching reference: rs1138272, rs1695 Where the VARS Triad and MTHFR Daily fit If you are exploring homocysteine or cytokines, Dr. Purser may discuss MTHFR Daily and the VARS Triad: VARS Gl…

Gene referenceSep 23, 2026

GSTT1

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…oose a supplement dose for you. Variant IDs in the teaching reference: rs17856199, rs2266637 Where the VARS Triad and MTHFR Daily fit If you are exploring homocysteine or cytokines, Dr. Purser may discuss MTHFR Daily and the VARS Triad: VAR…

Gene referenceSep 23, 2026

HDC

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… receive histamine signals. Putting the pieces together The reference discusses dietary patterns and clinician-selected antihistamine approaches in this section. These are different mechanisms, not a recommendation to combine treatments fro…

Gene referenceSep 23, 2026

HLA-DQA2

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…rder. CD4 T cells are helper T cells; they should not be mislabeled as the usual cytotoxic CD8 T-cell group. A question to bring to your visit Does this specific HLA marker have a validated clinical interpretation for the question being inv…

Gene referenceSep 23, 2026

HRH1

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…eptor H1 Receiving the histamine signal The Purser genetics reference places HRH1 in the histamine-response part of the MCAS discussion. H1 receptors help mediate histamine effects; they are not the enzymes that make histamine or break it d…

Gene referenceSep 23, 2026

HRH2

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…stamine also connects to stomach acid Dr. Purser’s genetics reference connects HRH2 with histamine signaling and gastric acid secretion. H2 is a receptor, so this teaching concerns response to a signal rather than histamine production by HD…

Gene referenceSep 23, 2026

IL21

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…ecific clinical interpretation? Variant IDs in the teaching reference: rs13119723, rs6822844 Also called: IL-21, Interleukin 21 Where the VARS Triad and MTHFR Daily fit If you are exploring homocysteine or cytokines, Dr. Purser may discuss …

Gene referenceSep 23, 2026

IL23R

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…tory condition being discussed? Variant IDs in the teaching reference: rs10889677, rs11209026, rs1343151, rs7517847 Where the VARS Triad and MTHFR Daily fit If you are exploring homocysteine or cytokines, Dr. Purser may discuss MTHFR Daily …

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