THE PURSER WELLNESS LIBRARY

Let’s explore Understanding a nutrient deficiency

A COURSE FOR YOUR CURIOSITYGetting to know your micronutrients

5 chapters, at your pace

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389 discoveries for your curiosity50 matching listings grouped; alternative sources stay available.

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Nutrient referenceSep 17, 2026

Potassium

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…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. Food sources Potatoes; bea…

Nutrient referenceSep 17, 2026

Pycnogenol

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…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 A pine-bark extract, not an ordinary food. Other …

Nutrient referenceSep 17, 2026

Quercetin

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…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 Onions, apples, berries and other plant foods. Su…

Nutrient referenceSep 17, 2026

Resveratrol

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…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 Grape skins, peanuts and certain berries. Alcohol…

Nutrient referenceSep 17, 2026

Selenium

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…hyroid hormone metabolism and antioxidant defense. Possible deficiency symptoms Deficiency is uncommon in many settings and cannot be identified from fatigue alone. Food sources Seafood; meat; eggs; grains; Brazil nuts, whose selenium conte…

Nutrient referenceSep 17, 2026

L-Serine

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…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 Protein foods such as eggs, fish, poultry, meat, d…

Nutrient referenceSep 17, 2026

Shiitake

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…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 Cooked shiitake mushrooms. Supplement forms Culin…

Nutrient referenceSep 17, 2026

Strontium

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…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 17, 2026

Sulforaphane

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…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 Broccoli and other cruciferous vegetables supply …

Nutrient referenceSep 17, 2026

Taurine

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…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…

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