Vitamin A
Some search terms matched…eficiency can cause night blindness and eye-surface damage.
Food sources
Eggs; dairy; liver; orange and dark-green vegetables containing provitamin A carotenoids.
Supplement forms
Retinyl palmitate, retinyl acetate and beta-carotene.
Before…
Vitamin B12 (Cobalamin)
Some search terms matched…nd memory changes. Nerve symptoms can occur without anemia.
Food sources
Fish; meat; eggs; dairy; foods fortified with B12. Unfortified plant foods are not reliable sources.
Supplement forms
Cyanocobalamin, methylcobalamin, hydroxocobalamin…
Vitamin B2 (Riboflavin)
Some search terms matched… at the corners of the mouth, sore throat and skin changes.
Food sources
Milk; yogurt; eggs; meats; almonds; fortified cereals.
Supplement forms
Riboflavin and riboflavin-5-phosphate.
Before taking a supplement
Bright-yellow urine can follo…
Vitamin B3 (Niacin)
Some search terms matched…hich can involve skin, digestive and neurological symptoms.
Food sources
Poultry; fish; meat; peanuts; enriched grains.
Supplement forms
Nicotinic acid and nicotinamide (niacinamide).
Before taking a supplement
High-dose niacin can harm the…
Vitamin B6 (Pyridoxine)
Some search terms matched…anemia, dermatitis, mouth changes or neurological symptoms.
Food sources
Chickpeas; fish; poultry; potatoes; bananas; fortified cereals.
Supplement forms
Pyridoxine hydrochloride and pyridoxal-5-phosphate (P5P).
Before taking a supplement
E…
Vitamin B9 (Folate)
Some search terms matched…Folate, B9, folic acid, methylfolate, 5-MTHF, folinic acid, foods high in folate
What it does
Supports DNA synthesis and one-carbon metabolism, including the pathway that processes homocysteine.
Possible deficiency symptoms
Deficiency may c…
Vitamin C (Ascorbic Acid)
Some search terms matched…eeding gums, easy bruising, poor wound healing and fatigue.
Food sources
Citrus; bell peppers; kiwi; strawberries; broccoli.
Supplement forms
Ascorbic acid and mineral ascorbates.
Before taking a supplement
Large doses can cause diarrhea an…
Vitamin D
Some search terms matched…n or muscle weakness. Many people have no obvious symptoms.
Food sources
Fatty fish; egg yolks; fortified milk or plant drinks; some UV-exposed mushrooms. Sun exposure is not a food source.
Supplement forms
D2 (ergocalciferol) and D3 (chole…
Vitamin K1 (Phylloquinone)
Some search terms matched… can cause abnormal bleeding; it needs clinical evaluation.
Food sources
Leafy greens; broccoli; Brussels sprouts.
Supplement forms
Phylloquinone, also called phytonadione.
Before taking a supplement
If taking warfarin, discuss vitamin K in…
Wild Cherry Bark
Some search terms matched…d. Symptoms are not evidence that you need this supplement.
Food sources
Not an everyday food source. Do not prepare or ingest bark at home.
Supplement forms
Preparations vary. Check the ingredient identity and amount on the product label.
…
Zeaxanthin
Some search terms matchedA carotenoid found in foods and in the retina.
Also called: Zeaxanthin
What it does
A carotenoid found in foods and in the retina.
What symptoms can—and cannot—tell you
There is no established dietary deficiency syndrome for this specific b…
Zinc
Some search terms matched…l, appetite and skin. These findings have other causes too.
Food sources
Oysters; meat; poultry; beans; pumpkin seeds; fortified cereals.
Supplement forms
Zinc gluconate, citrate and sulfate are examples.
Before taking a supplement
Long-ter…
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