Our Members Asked:
Is it possible to get too much vitamin D?
Raising low levels of vitamin D has many benefits. Among them is that levels of C-reactive protein (CRP), a marker of inflammation, decrease as vitamin D levels increase. However, increasing vitamin D levels beyond sufficient levels has a slight inflammatory action, as shown in a recent study. And even higher levels of vitamin D can result in hypercalcemia (too much calcium in the blood) with symptoms including constipation, confusion, weakness, loss of appetite and painful calcium deposits. For details about this and extensive information about vitamin D uses and dosage, see the Vitamin D Supplements Review, which includes our latest product tests.
Related CL Answers (14)
Risks of Too Many Vitamins & Supplements
Taking too many vitamin supplements -- or taking too much of a particular supplement -- can have short and long-term adverse effects.
Does OsteoMD improve calcium absorption and increase bone density?
ConsumerLab reviews the evidence for OsteoMD by 1MD, a bone health supplement promoted to slow bone loss and reduce the risk of osteoporosis.
How much calcium do you need each day, what forms are best, and how much is too much?
Learn about the recommended daily intake of calcium from food & supplements and why taking too much can be harmful. Also, learn about the forms of calcium that are available and which are best.
Is it okay to take vitamin D3 and fish oil together?
Find out if taking vitamin D and fish oil is okay, how it effects absorption, and the best way to take vitamin D to improve absorption. ConsumerLab.com's answer explains.
What are the symptoms of vitamin D deficiency?
Learn about the symptoms of vitamin D deficiency, such as soft or weak bones, bone, joint and muscle pain, depression, insomnia, hair loss and others, and find out how much vitamin D you need. ConsumerLab.com's answer explains.
What is the best source of vitamin D3 -- from lanolin in sheep's wool or from fish oil?
Learn more about vitamin D3 sources, such as lanolin (from wool) and fish oil, as well as their prices and their effects.
Which supplements and foods can help treat constipation?
Find out which supplements and foods can help for constipation, including fiber, flaxseed, probiotics, magnesium and fruit.
Do any supplements improve balance or reduce the risk of falls?
Find out which vitamins & supplements may improve your balance to help reduce the risk of falling, including vitamin D and protein.
Is there a difference between taking vitamin D in the dry form versus the oil capsules? Is one better than the other?
Learn more about how to take vitamin D, the best form to take and the best time of time day to take vitamin D.
Do any supplements or diets help prevent or treat osteoporosis?
If you have osteoporosis, you may be interested in supplements or diets for bone health. Find out which can increase bone strength and density.
I spend a lot of time in the sun, especially in the summer. Does this mean my vitamin D levels could get too high?
Find out if spending too much time outside, especially in the summer, can cause excess vitamin D levels in the body.
I've heard that taking vitamin D can reduce your natural production of melatonin and interfere with sleep. Is this true?
Can Vitamin D interfere with your body's melatonin production, and can taking vitamin D interfere with sleep?
I read that aging lowers the body's capacity to produce vitamin D from the sun and one may have to take a vitamin D3 supplement during old age to meet regular requirements. Please comment on this.
Learn more about the effects of aging on the body's ability to produce vitamin D.
A blood test showed my vitamin D level is low. How do I know how much vitamin D to take?
Find out how to increase vitamin D blood levels, including a good target range.
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