THE PURSER WELLNESS ENCYCLOPEDIA

Let’s explore “vitamin D”

A RELATED COURSEGetting to know your micronutrients

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New to this subject? Start with this free introduction.Is a Vitamin Deficiency the Root Cause of Your Problems?

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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.

Gene referenceSep 23, 2026

ALPL

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ALPL encodes tissue-nonspecific alkaline phosphatase, an enzyme important to bone and tooth mineralization and vitamin B6 metabolism. Persistently low alkaline phosphatase can deserve a different evaluation from a general nutrient deficiency.

Gene referenceSep 23, 2026

GSTO2

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GSTO2 encodes glutathione S-transferase omega 2, a redox enzyme with dehydroascorbate reductase activity that connects glutathione chemistry with vitamin C recycling. It is a separate gene from GSTO1.

FacebookAug 13, 2026

What if your homocysteine level is telling you more than you realize?

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What if your homocysteine level is telling you more than you realize? When kidney function declines, homocysteine levels often rise because the kidneys play an important role in its metabolism and clearance. In people with chronic kidney d

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YouTubeAug 6, 2026

OVER-METHYLATION - Are Your B Vitamins Hurting You?

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Can the B vitamins you are taking to support energy and methylation eventually make you feel worse? In this video, Jackson Larkin explains what practitioners often call “overmethylation,” a possible adverse response to supplemental methyl donors such as: • 5-MTHF or methylfolate • Methylcobalamin • Trimethylglycine, also called TMG • Multiple overlapping methylation formulas Possible warning signs can include irritability, anxiety, restlessness, insomnia, brain fog, fatigue, and feeling “wired but tired.” These symptoms do not prove that you are overmethylated. They can have many possible causes. The timing of symptoms, your total supplement exposure, nutrient status, genetics, medications, and health history all need to be considered. In this video, we discuss: • Why methylation is essential • How methyl-donor supplements support the body • Why the right vitamin can become the wrong dose • Ingredients to look for on your supplement labels • Why some people may need lower doses or non-methylated forms • How genetics and intracellular nutrient testing can guide a more personalized plan At Purser Wellness, we believe in a Start Low, Go Slow approach. The goal is not to eliminate methylation. The goal is to provide the right form and amount of support for each individual. Learn more or schedule with Purser Wellness: https://danpursermd.com Educational content only. Do not discontinue prescribed or medically necessary supplements without consulting your qualified healthcare professional. #Overmethylation #MTHFR #Methylation #B12 #Methylfolate #VitaminB12 #TMG #BrainFog #FunctionalMedicine #PurserWellness Follow Dr. Purser! Info: http://www.DanPurserMD.com Supplements: https://www.PhysicianDesigned.com Books: https://www.amazon.com/-/e/B00BIKSGVQ Facebook: https://www.facebook.com/danpursermd Facebook: https://www.facebook.com/PhysicianDesigned Twitter: https://twitter.com/realdanpursermd YouTube: https://www.youtube.com/danpursermd Instagram: https://www.instagram.com/danpurser.md Pinterest: https://www.pinterest.com/danpursermd

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InstagramJul 20, 2026

What if the key to feeling better isn't another health trend—but understanding the nutrients your body depends on…

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What if the key to feeling better isn't another health trend—but understanding the nutrients your body depends on every day? Vitamin C. B vitamins. Iron. These essential nutrients influence everything from energy production and immune fun

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