THE PURSER WELLNESS ENCYCLOPEDIA

Let’s explore “Vitamin B9 / folate deficiency”

Explore this topic as a step-by-step interactive map.MTHFR, the citric acid cycle & ATP
A RELATED COURSEGetting to know your micronutrients

5 chapters, at your pace

Explore the course
Explore all 2 matching courses

763 resources for your curiosity122 matching listings grouped; alternative sources stay available.

What’s searchable?
Nutrient referenceSep 23, 2026

Pomegranate

Some search terms matched

…APA result. A cell-response finding is not a diagnosis of a deficiency in this botanical or compound. Pomegranate fruit, juice and concentrated extracts have different nutritional profiles. What symptoms can—and cannot—tell you There is no…

Nutrient referenceSep 23, 2026

Potassium

Some search terms matched

…d balance, nerve signaling and muscle contraction. Possible deficiency symptoms Low blood potassium can cause weakness, constipation or abnormal heart rhythms. Medicines and fluid losses are common considerations. How supplementation is app…

Nutrient referenceSep 23, 2026

Pycnogenol

Some search terms matched

…APA result. A cell-response finding is not a diagnosis of a deficiency in this botanical or compound. Pycnogenol is a branded pine-bark extract; it should not be used as a generic name for every pine-bark product. What symptoms can—and can…

Nutrient referenceSep 23, 2026

Quercetin

Some search terms matched

…APA result. A cell-response finding is not a diagnosis of a deficiency in this botanical or compound. Quercetin may be supplied alone or with ingredients such as bromelain or other antioxidants. Check the complete formula. What symptoms ca…

Nutrient referenceSep 23, 2026

Resveratrol

Some search terms matched

…APA result. A cell-response finding is not a diagnosis of a deficiency in this botanical or compound. Resveratrol extracts differ from resveratrol-containing foods. Concentration and companion ingredients vary. What symptoms can—and cannot…

Nutrient referenceSep 23, 2026

Rhodiola

Some search terms matched

…APA result. A cell-response finding is not a diagnosis of a deficiency in this botanical or compound. Rhodiola extracts and multi-ingredient energy/adaptogen formulas differ. Record the exact product if discussing a trial. What symptoms ca…

Nutrient referenceSep 23, 2026

Selenium

Some search terms matched

…t enzymes work, but a GPX variant does not prove a selenium deficiency. Review food, multivitamins, thyroid products and separate supplements together. Taking too much selenium can be harmful. How supplementation is approached Dr. Purser co…

Nutrient referenceSep 23, 2026

Shiitake

Some search terms matched

…APA result. A cell-response finding is not a diagnosis of a deficiency in this botanical or compound. Shiitake mushrooms used as food differ from concentrated mushroom extracts. What symptoms can—and cannot—tell you There is no established…

Nutrient referenceSep 23, 2026

Strontium

Some search terms matched

…oms can—and cannot—tell you There is no established dietary deficiency syndrome for this specific botanical or compound. Symptoms are not evidence that you need this supplement. Food sources Trace amounts occur in foods and water; there is …

Nutrient referenceSep 23, 2026

Sulforaphane

Some search terms matched

…APA result. A cell-response finding is not a diagnosis of a deficiency in this botanical or compound. Broccoli-derived preparations may supply sulforaphane or its precursor glucoraphanin, sometimes with myrosinase. These labels are not int…

Nutrient referenceSep 23, 2026

Taurine

Some search terms matched

…e or a laboratory finding is not automatically a standalone deficiency diagnosis. Assess overall protein intake, absorption and the clinical setting with a qualified clinician. Food sources Fish, shellfish, meat and dairy contain taurine; t…

Search looks for your words in titles, descriptions, available articles, learning guides, and video captions when available. The closest matches appear first. Duplicate posts are grouped, with links to other places you can read or watch them. Books, chapters, and reports have topic guides here; the original files and full book text are not available in this encyclopedia. Subscriber posts include a title and public summary; open Substack to read the full post.