How much Multivitamins should I take daily?

Introduction

The daily intake of multivitamins is a topic of interest due to their potential health benefits and the need to meet recommended nutrient intakes. Research has explored the adequacy of multivitamin content, the association with health outcomes, and the bioavailability of vitamins from different supplement forms.

Key Insights from Research Papers

Multivitamin products often do not supply the recommended daily amount of vitamin D, with only 25-36% of surveyed children's multivitamins containing at least 400 IU/day, which is the advised supplementation for children over 1 year.
Excessive use of multivitamins, defined as more than seven times per week, is associated with an increased risk of advanced and fatal prostate cancers, especially in men with a family history of prostate cancer or who take additional individual micronutrient supplements.
The form of vitamin D supplementation, whether from fish oil capsules or multivitamin tablets, does not significantly affect the increase in serum 25-hydroxyvitamin D concentration after 4 weeks of daily intake, suggesting similar bioavailability from these two sources.

Conclusion

In conclusion, it is important to select multivitamin products that meet the recommended daily allowances, particularly for vitamin D. However, caution is advised against excessive consumption, as it may be associated with increased health risks, such as advanced prostate cancer. Additionally, the form of the vitamin supplement, whether as a tablet or oil capsule, does not appear to significantly impact the absorption of vitamin D.

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How much Multivitamins should I take daily?

Summary

Introduction

Key Insights from Research Papers

Conclusion

Sources and full results

Vitamin D supplementation: are multivitamins sufficient?

Few children's multivitamin products supply the recommended 400 IU/day vitamin D, highlighting the need for clinicians to advise parents on choosing a supplement with higher vitamin D content.

Multivitamin use and risk of prostate cancer in the National Institutes of Health-AARP Diet and Health Study.

Excessive multivitamin use (more than seven times per week) is associated with an increased risk of advanced and fatal prostate cancers, but regular use is not.

A randomised comparison of increase in serum 25-hydroxyvitamin D concentration after 4 weeks of daily oral intake of 10 μg cholecalciferol from multivitamin tablets or fish oil capsules in healthy young adults

Fish oil capsules and multivitamin tablets containing 10 g cholecalciferol both produce a similar mean increase in serum 25-hydroxyvitamin D concentration after 4 weeks of daily intake.

A randomized trial to determine the optimal dosage of multivitamin supplements to reduce adverse pregnancy outcomes among HIV-infected women in Tanzania.

A single dose of the Recommended Dietary Allowance may be as effective as multiple doses in decreasing the risk of adverse pregnancy outcomes among HIV-infected women.

Dietary supplement use by US adults: data from the National Health and Nutrition Examination Survey, 1999-2000.

Dietary supplement use is prevalent among US adults, with factors like gender, age, education, and lifestyle influencing supplement use.

The Efficacy and Safety of Multivitamin and Mineral Supplement Use To Prevent Cancer and Chronic Disease in Adults: A Systematic Review for a National Institutes of Health State-of-the-Science Conference

Multivitamin and mineral supplements are effective in primary prevention of cancer and chronic diseases in adults, with no known adverse effects.

Abstract 3245: Multivitamins and cancer in the Physicians’ Health Study II: Expanded analyses and insights

Daily multivitamin use may benefit digestive and respiratory cancers, and genitourinary cancer in men with a history of cancer.

Multivitamins in the prevention of cancer in men: the Physicians' Health Study II randomized controlled trial.

Daily multivitamin supplementation modestly reduces the risk of total cancer in male physicians, but not prostate, colorectal, or other site-specific cancers.

Multivitamin Use and Overall and Site-Specific Cancer Risks in the National Institutes of Health-AARP Diet and Health Study.

Multivitamin use is not cancer-preventive, except for colon cancer, and may increase risks of prostate, lung, and leukemia in men, with a higher oropharyngeal cancer risk in women.

Measurements of Iron Absorption from Prenatal Multivitamin-Mineral Supplements

Many prenatal multivitamin-mineral supplements have significantly less iron absorption than standard forms in nonpregnant women, requiring further bioavailability studies for pregnant patients.

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