THE PURSER WELLNESS ENCYCLOPEDIA

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Nutrient referenceSep 23, 2026

Vitamin A

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Supports vision, immune function and tissue development. Also called: Vitamin A What it does Supports vision, immune function and tissue development. Possible deficiency symptoms Deficiency can cause night blindness and eye-surface damage. …

Nutrient referenceSep 23, 2026

Vitamin D

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Helps calcium absorption and bone mineralization. Also called: Vitamin D A nutrient level and a receptor gene answer different questions Dr. Purser places vitamin D in immune, hormone and bone-related teaching. The conversion-genetics chapt…

Nutrient referenceSep 23, 2026

Zeaxanthin

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A carotenoid found in foods and in the retina. Also called: Zeaxanthin What it does A carotenoid found in foods and in the retina. How supplementation is approached Zeaxanthin is a plant pigment found in the eye and often paired with lutein…

Nutrient referenceSep 23, 2026

Zinc

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Supports enzymes, immune function, wound healing and taste. Also called: Zinc Read zinc together with copper Zinc connects with immune function, hormones, copper handling and antioxidant enzymes. A plan for zinc should also account for othe…

Gene referenceSep 23, 2026

BCO1

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BCO1, also called BCMO1, helps convert beta-carotene from plant foods into retinal, a form used in vitamin A metabolism. Plant carotenoids and preformed vitamin A therefore enter the pathway at different points. Also called: BCMO1, Beta-Car…

Gene referenceSep 23, 2026

BRCA1

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BRCA1 helps repair damaged DNA. Clinically classified pathogenic variants can affect inherited cancer risk; a common SNP or a variant of uncertain significance is a different finding. Also called: Breast Cancer 1 DNA repair and inherited ca…

Gene referenceSep 23, 2026

BRCA2

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BRCA2 helps repair damaged DNA. Clinically classified pathogenic variants can affect inherited cancer risk; a common SNP or a variant of uncertain significance is a different finding. Also called: Breast Cancer 2 DNA repair and inherited ca…

Gene referenceSep 23, 2026

CBS

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CBS helps move homocysteine into the pathway that supplies building blocks for glutathione. Also called: Cystathionine Beta-Synthase From homocysteine toward glutathione Dr. Purser places CBS in the sulfur-handling pathway that connects hom…

Gene referenceSep 23, 2026

CD14

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CD14 helps immune cells recognize microbial components, including bacterial lipopolysaccharide, as part of innate immune signaling. This places it upstream of some cytokine responses. Also called: Cluster of Differentiation 14 How immune ce…

Gene referenceSep 23, 2026

CHDH

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CHDH helps convert choline toward betaine, a nutrient involved in the homocysteine pathway. Also called: Choline Dehydrogenase Choline can serve more than one purpose CHDH helps convert choline toward betaine, while PEMT helps make phosphat…

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