17 votes

Are calcium supplements harmful, even if you stay short of the maximum dose?

Background In the past 10-15 years, thinking on calcium supplementation has shifted significantly. In 2001, a National Institutes of Health (NIH) Consensus Development Panel on Osteoporosis made the ...
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  • 4,355
11 votes
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Is UV light necessary for vitamin D generation?

Short answer: No. Longer answer: UVB rays are essential for Vitamin D synthesis. According to some studies, 1 hour of sunshine is needed even in sunny climates - but only in average, still depending ...
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  • 781
11 votes

Do we produce Vitamin D in the shade?

The exact value depends on a lot of things - skin tone, the time of day, latitude, how deep the shade is,... The study Vitamin D effective ultraviolet wavelengths due to scattering in shade found ...
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  • 6,998
11 votes
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What needs to be exposed for the body to produce Vitamin D?

Vitamin D is produced in the skin, not the eyes.(1) I would imagine that when those indigenous peoples were introduced to sunglasses, they were also introduced to a number of other items they had ...
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  • 9,314
10 votes

Is exceeding the US RDA for vitamin C dangerous?

Overloading on vitamin C won't cause death. At around 1000 mg, you will probably have nausea, diarrhea, and stomach aches. 2000 mg is the daily limit, and if you get that high, you will experience ...
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  • 7,717
10 votes
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Is exceeding the US RDA for vitamin C dangerous?

Vitamin C (ascorbic acid - an antioxidant and reducing agent) is water soluble (so dietary excesses not absorbed), and excesses in the blood rapidly excreted in the urine. It exhibits remarkably low ...
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  • 4,697
9 votes
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Time needed for vitamin B6 to reach the brain

The medical way to ask your question is "What are the pharmacokinetics of pyridoxine (B6 version that you're likely to take)?" Then that brings us to both primary and secondary sources, along with a ...
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  • 1,836
8 votes
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Do you need to consume iodised salt?

Iodine is absolutely an essential mineral, and is required for proper functioning of your body. It is a component of the thyroid hormone triiodothyronine (also known as T3) and its precursor form T4 (...
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  • 273
8 votes
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Do protein bars/shakes provide nutrients that your body can use?

What you are asking about is called bioavailability, which is the term for how much of a consumed substance is actually taken up by the body, and bioequivalence, which is about whether two products ...
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  • 6,998
7 votes

Do we produce Vitamin D in the shade?

About 1/4 - it varies with the reflectivity of the surface, and angle of the sun. Detailed study is at http://www.ncbi.nlm.nih.gov/pubmed/20199222
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7 votes

Is it possible to reverse the skin cell damage caused by sunlight by taking appropriate vitamins?

No Skin damage is irreversible. The only thing you can do is make sure your skin is not damaged in the first place. Skin damage is caused by a variety of factors, but by far the most important one ...
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7 votes
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Do vitamins affect sense of taste?

So it's important to separate cravings/specific hungers from taste. One's body should, to some degree be able to adjust it's specific hungers to meet it's dietary needs. This one area where our ...
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  • 1,836
7 votes

How to gain weight naturally or by food around the house

Unless you are very short, your weight indicates that you are severely underweight, see here for details. If you are indeed underweight, then you should follow the advice given there: If you are ...
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  • 2,218
6 votes
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Do light boxes effectively mimic the effects of natural sunlight to produce vitamin D?

Only two things affect the synthesis of vitamin D, and those are the amount of UVB photons penetrating the skin and the person's age. See my previous answer for an explanation and citations. So if we ...
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  • 9,314
6 votes

Is exceeding the US RDA for vitamin C dangerous?

There are two important types of vitamins. Fat soluble and Water Soluble. Your body will store fat soluble vitamins but will discard excess water soluble vitamins in your urine. Because of this fat ...
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  • 579
6 votes
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Taking Supplements - space out my Vitamin A? And the others?

Unless you're doing something stupid like eating polar bear liver, hypervitaminosis A is the result of long-term overconsumption: taking one supplement in the morning and one in the evening is no more ...
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  • 1,970
6 votes

Is there a relationship between vitamin D levels and cholesterol?

According to a couple of systematic reviews of studies, there is insufficient evidence about the lowering effect of vitamin D on blood cholesterol levels. Vitamin D, Evidence Mayo Clinic (data from ...
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  • 15.6k
6 votes

Can effervescent multivitamin tablets cause teeth problems?

Couldn't find any articles directly looking at effervescent tablets and dental problems, so I took a more broad look and searched for citric acid's effect on teeth. The combination of citric acid and ...
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6 votes
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Is there an objective answer to whether or not taking a multi-vitamin dietary supplement is beneficial to health?

Is there an objective answer to whether or not taking a multi-vitamin dietary supplement is beneficial to health? No, there is not. If you dig into the existing research, unless you are looking to ...
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  • 651
5 votes

Is it possible to reverse the skin cell damage caused by sunlight by taking appropriate vitamins?

You can't reverse the skin damage, but you can treat wounds and burns, so your skin cell can regenerate faster. Eating food full of antioxidants and vitamin C, such as blueberries, tomatoes, and ...
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  • 4,697
5 votes

How to gain weight naturally or by food around the house

To increase weight and be healthy eat plenty of food rich in proteins (black beans, chickpeas, broccoli, potatoes, mushrooms), carbohydrates (Whole grain bread, pasta, cereals) and fat (avocado, olive ...
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5 votes
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Cold pressed canola oil

There doesn't seem to be any evidence of harmful effects of canola oil. The Mayo Clinic site states : Health concerns about canola oil are unfounded. Canola oil, which is extracted from the seeds ...
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  • 441
5 votes

Does vitamin D supplementation fully replace sun exposure to avoid vitamin D insufficiency?

Nicely, sunlight is best. While we are still not knowing nearly enough concerning all the details, that's a safe bet. Even the supplement lobby acknowledges that: Despite the increased risk of non-...
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  • 6,757
5 votes

Optimum / limit daily dose of Vitamin C?

Here are few aspects of high-dose vitamin C supplements. The upper limit(UL) 2,000 mg for vitamin C is not some sort of recommendation, but a dose, which, if exceeded, can cause nausea and diarrhea, ...
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5 votes
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Vitamin supplements with a balanced diet

Vitamins and minerals from foods an supplements taken simultaneously can be absorbed normally, because their absorption is usually not regulated by the amounts you take. However, the absorption of ...
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  • 15.6k
4 votes

Does one absorb more nutrients from juices than the whole fruit?

This might be true for some substances and false for others. For example, might be true for beta-carotene: Soluble fiber may inhibit ß-carotene absorption; therefore, consumption of juice may ...
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4 votes
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Quantitatively and relative to the RDI of 900 μg, when does Vitamin A consumption become harmful?

The quantitive figures for Vitamin A overdose are well established, and widely published. The RDI in the United States (Different countries may have different values) is 900 micrograms for men, and ...
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  • 6,524
4 votes

restoring a live tooth

No, there is no evidence in reputable sources that any diet can restore a partially removed tooth to a full tooth again. Any source you do encounter which proposes such a possibility is highly likely ...
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4 votes
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High level of Vitamin D,1,25(OH)2, Total

This could be linked to your diet, but Vitamin D is not found in many foods (with the exception of fish and fortified foods). However, there have been some reports that laboratories may be producing ...
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4 votes
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Does taking Vitmain B-Complex with zinc through tablets really help in reversing hair fall

I found an expert answer for your question. May be this will help you to take right decision. NDTV Doctors: "There is no harm in taking a combination of B-complex vitamins with zinc but there is ...
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