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

Leucine

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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

Lipoic Acid

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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 Small amounts occur in foods such as organ meats …

Nutrient referenceSep 17, 2026

Lithium

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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 water and food. This does …

Nutrient referenceSep 17, 2026

Lutein

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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 Spinach, kale, broccoli and egg yolks. Supplement…

Nutrient referenceSep 17, 2026

Lycopene

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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 Tomatoes, watermelon and pink grapefruit. Supplem…

Nutrient referenceSep 17, 2026

L-Lysine

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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

Magnesium

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…tes in energy production. Also called: Magnesium, magnesium deficiency, muscle cramps What it does Helps enzymes, nerves and muscles work, and participates in energy production. Possible deficiency symptoms Low magnesium can cause fatigue, …

Nutrient referenceSep 17, 2026

Maitake

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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 maitake mushrooms. Supplement forms Culina…

Nutrient referenceSep 17, 2026

Manganese

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…ding a mitochondrial antioxidant enzyme, function. Possible deficiency symptoms Human deficiency is rare; symptoms alone are not a reliable way to assess status. Food sources Whole grains; nuts; legumes; tea. Supplement forms Manganese sulf…

Nutrient referenceSep 17, 2026

Mangosteen

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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 Mangosteen fruit. Supplement forms Fruit products…

Nutrient referenceSep 17, 2026

Melatonin

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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 Foods are not a reliable substitute for assessmen…

Nutrient referenceSep 17, 2026

L-Methionine

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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…

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