Doctor insights on:
How Much Vitamin D Is Too Much For Adults
That exceeding norm : Any amount of vitamin d supplementation that causes your vitamin d level to exceed optimal is too high. Know your numbers. Have your vitamin d level checked. 30-100 is normal. Vitamin d and calcium are neccessay for strong bones. In excess, calcium increases your risk for a cardiovasular or heart event, and vitamin d excess can cause fractures. ...Read more
Unlikely to be a pbm: Vitamin c is a water soluble vitamin that you start dumping into your urine as soon as it reaches a level above the bodies need. It does not store in the body & produce overuse disorders like some. It's value in health is certainly critical for those with deficiencies, but value for other issues is questionable.Americans have some of the most expensive pee in the world. ...Read more
Which Vitamin B?: Vitamin b is not a single vitamin but a group including b1, 2, 3, 5, 6, 12, Folic Acid ; biotin.B6 may be toxic at doses of 200 mg/day. The others are generally considered non-toxic.Some report benefits of up to 2000 mg/day of b3 ; b5 ; those doses appear to be safe. There's no known need for more than 100 mg of b1 or b2/day.Potential benefits of up to 10 mg of folate (folic acid) ; 20 mg of biotin.High B12 is safe. ...Read moreSee 1 more doctor answer
See below please: U.S. Recommended dietary allowance (rda) for adults is as follows: 900 micrograms daily (3, 000 iu) for men and 700 micrograms daily (2, 300 iu) for women; for pregnant women 19 years old and older, 770 micrograms daily (2, 600 iu); and for lactating women 19 years old and older, 1, 300 micrograms daily (4, 300 iu). ...Read more
How much magnesium a day? How much is too much? Could magnesium contribute to insomnia if too much is taken?
Magnesium and sleep: Magnesium (Mg) is found in a variety of foods. If you eat a diverse diet (particularly high fiber foods), you will get plenty of Mg. The body regulates it quite well so unless you take Mg pills, there's no reason to worry about excess. As for sleep, Mg deficiency is associated with insomnia. So getting plenty of Mg from food is a good thing for sleep. Leafy greens, nuts, whole grains, seeds. ...Read more
No perfect answer: If you're referring to oral iron, your iron level is normal and you have no underlying blood disorders like thalassemia, it's very difficult to take in too much iron. The body typically only absorbs as much iron from your diet as it needs. Persons receiving frequent transfusions or with conditions like hemochromatosis will have high iron levels, but these are uncommon. ...Read more
Depends: Depends on the vitamin, mineral, age and sex of the individual. Different needs at different stages of growth and life.. Some minerals and vitamins can be toxic-not just fat soluble vitamins like a and d, but also e.g. B6 (water soluble) which can cause nerve damage in excess (or deficiency). ...Read more
Yes. : Recommended dietary allowance (rda) for vitamin c in mg/day infants 0-6 months: 40 7-12 months: 50 children: 1-3 years: 15 4-8 years: 25 9-13 years: 45 girls: 14-18 years: 65 boys: 14-18 years: 75 men: age 19 and older: 90 women: age 19 and older 75 smokers or if around secondhand smoke at any age, add 35 mg/d. Higher amounts of vitamin c are needed during pregnancy and breastfeeding. ...Read more
Does vitamin D3 1000mcg help balance an underactive thyroid? And why is too much vitamin D3 toxic? How much is too much?
No.Low Thyroid: Is treated with the appropriate dose of l- thyroxine or similar thyroid rx.Vitamin d level can be measured, and if low, should be raised by vit d replacement.If truly low, replacement doses of up to 50, 000u/wk are initially given.It is very important to have normal levels. ...Read more
Depends: If you have had your Vit D level tested, your doctor has probably given you some recommendations based on that. Encourage him to write prescription strength if your insurance pays for i (sometimes prescription strength, if generic, can be cheaper than over the counter too, even if you don't have insurance). Your Doc's advice is best. Too much/too little is not good. ...Read moreSee 2 more doctor answers
Vitamin C: Too much of a good thing can be bad as you imply with your question. The important factor with kidney stones is fluid intake. When the kidneys have too many solids to filter, microcrystals will begin to form stones. Excessive vitamins contribute to this problem. I would say 500-1000 mg/day is reasonable, but if you have a FH for stones, use caution here. Drink more, especially in the summer! ...Read moreSee 1 more doctor answer
Probably fine: Epidemiology generates all kinds of junk data and I'd ignore studies that report, "Thus-and-so many people with more than thus-and-so daily had more / thus of thus-and-so" unless it makes physiologic sense. This is more than you need to be healthy. Ten thousand is an often-cited recommended upper limit. Much higher vitamin A intake actually will make you sick. ...Read moreSee 1 more doctor answer
Melatonin: Since there is no established dose for melatonin, it is recommended to start low (0.3 mg) & work up to 5 mg, taken usually 30 - 60 minutes before bedtime. Potential side effects are nausea/vomiting, headache, irritability. If morning drowsiness occurs, reduce dose or take earlier before bedtime. Choose reliable manufacturer since ingredient quality may vary (not regulated by govt). ...Read moreSee 1 more doctor answer
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