Vitamin D: How much is too much?

Q.	Is it possible to take too much vitamin D? I know vitamin D is important, but I wonder if too much is dangerous? No name / No state given see response Mayo Clinic dietitian Katherine Zeratsky, R.D., L.D., and colleagues answer select questions from readers.

All Food & Nutrition Q&As:

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• Breakfast: Why is it so important?
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• Buying beef? A guide to choosing the leanest cuts
• Caffeine: Is it dehydrating or not?
• Calcium supplements: Should they be taken with meals?
• Calcium supplements: Which type is best?
• Calories in sushi: What are the low-cal options?



• Candida cleanse: Does it treat candidiasis?
• Canned food: How long can you safely keep it?
• Canned pumpkin: Better than fresh?
• Canola oil: Does it contain toxins?
• Chocolate: Does it impair calcium absorption?



• Coffee and health: What does the research say?
• Coffee calories: Sabotaging your weight-loss plans?
• Colloidal silver: Is it safe?
• Craving and chewing ice: A sign of anemia?
• Diet soda: Is it bad for you?



• Dietary supplements vs. food: Which is better?
• E. coli: How can I tell if food is contaminated?
• Energy drinks: Do they really give me energy?
• Fat grams or percentages: Which are more important?
• Fiber supplements: Are they safe to take every day?



• Food safety: How long can you keep leftovers?
• Freezing meat: Does it kill harmful bacteria?
• Freezing or microwaving plastic: Does it release dioxins?
• Fruit juice: Is it good or bad for kids?
• Glyconutrients: What are the health benefits?



• Grapefruit juice: Can it cause drug interactions?
• Ground flaxseed: Better than whole?
• High-fructose corn syrup: What are the concerns?
• Kombucha tea: What are the health benefits?
• Lentils: How do I cook with them?



• Low-sodium diet: Why is processed food so salty?
• Microwave popcorn: Is it linked to lung disease?
• Moldy cheese: Is it unsafe to eat?
• Monosodium glutamate (MSG): Is it harmful?
• Olive oil: What are the health benefits?



• Percent Daily Value: What does it mean?
• Phenylalanine in diet soda: Is it harmful?
• Prenatal vitamins: OK for women who aren't pregnant?
• Reactive hypoglycemia: What causes it?
• Roasting nuts: Lower fat by roasting in the shell?



• Sea salt vs. table salt: Which is better?
• Smart Balance: Are cholesterol-lowering products safe for everyone?
• Stevia: Is it available in the United States?
• Taurine in energy drinks: What is it?
• Thanksgiving turkey: Can you cook it frozen?



• Too skinny? How to add pounds safely
• Vegetable juice: As good as whole vegetables?
• Vitamin C: Can too much be harmful?
• Vitamin D: How much do I need?
• Vitamin D: How much is too much?



• Vitamin water: Better than plain water?
• White whole-wheat bread: Is it good for me?
• Yerba mate: Is it safe to drink?

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