THE PURSER WELLNESS LIBRARY

Let’s explore 25-hydroxyvitamin D, total — lab reference

A COURSE FOR YOUR CURIOSITYGetting to know your micronutrients

5 chapters, at your pace

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498 discoveries for your curiosity16 matching listings grouped; alternative sources stay available.

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Gene referenceSep 23, 2026

IL6

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IL6 encodes interleukin-6, a cytokine involved in immune responses and acute-phase signaling. It can appear in discussions of infection, chronic inflammation and metabolic health, with effects that depend on the context. Also called: IL-6, …

Gene referenceSep 23, 2026

KIT

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KIT encodes a receptor tyrosine kinase that responds to stem cell factor. It participates in blood-cell development and mast-cell biology, making the exact variant and testing context especially important. Also called: Kit Proto-Oncogene A …

Gene referenceSep 23, 2026

MAOA

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Dr. Also called: MAO-A, Monoamine Oxidase A Neurotransmitter breakdown in context Dr. Purser places MAOA in the neurotransmitter-breakdown part of his brain-chemistry map. The teaching connects it with mood, sleep and medication sensitivity…

Gene referenceSep 23, 2026

MAOB

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MAOB encodes monoamine oxidase B, an enzyme involved in breaking down monoamine compounds, including dopamine. It does not simply build dopamine, and a DNA marker is not a neurotransmitter measurement. Also called: MAO-B, Monoamine Oxidase …

Gene referenceSep 23, 2026

MMP3

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MMP3 encodes matrix metalloproteinase 3, an enzyme involved in breaking down components of the extracellular matrix. Controlled remodeling is part of repair, while excess activity can accompany inflammatory tissue damage. Also called: Matri…

Gene referenceSep 23, 2026

MTHFD1

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Dr. Also called: Methylenetetrahydrofolate Dehydrogenase 1 Folate has several working forms Dr. Purser includes MTHFD1 among genes involved in folate interconversion. The lesson is that folate participates in several reactions and exists in…

Gene referenceSep 23, 2026

MTHFD1L

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The homocysteine chapters include MTHFD1L in the wider folate-related genetic map. Also called: Methylenetetrahydrofolate Dehydrogenase 1-Like A mitochondrial contribution to one-carbon metabolism The homocysteine chapters include MTHFD1L i…

Gene referenceSep 23, 2026

MTHFR

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Makes an enzyme that helps produce a form of folate used in the processing of homocysteine. Common variants are different from rare variants that cause severe MTHFR deficiency. Also called: Methylenetetrahydrofolate Reductase, C677T, A1298C…

Gene referenceSep 23, 2026

MTR

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… in the conversion of homocysteine to methionine. Also called: Methionine Synthase The B12-dependent step In Dr. Purser’s teaching map, MTR is the B12-dependent step that converts homocysteine back to methionine. This helps explain why a me…

Gene referenceSep 23, 2026

MTRR

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…n the activity of methionine synthase, connecting B12-related chemistry with homocysteine metabolism. Also called: Methionine Synthase Reductase Keeping the remethylation system working Dr. Purser teaches MTRR alongside MTR because the path…

Gene referenceSep 23, 2026

NAT2

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NAT2 encodes N-acetyltransferase 2, which helps process certain drugs and other compounds. Combinations of variants can influence acetylation status; one SNP usually does not tell the entire story. Also called: N-Acetyltransferase 2 Acetyla…

Gene referenceSep 23, 2026

NOS3

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NOS3 encodes endothelial nitric oxide synthase, which helps blood vessels generate nitric oxide, a signal involved in vascular relaxation. This pathway is distinct from a blood pressure measurement or a diagnosis of vascular disease. Also c…

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