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الوسم: vitamin D

  • Can Excess Vitamin D Harm Brain Function?

    Can Excess Vitamin D Harm Brain Function?

    Vitamin D is primarily recognized for its role in helping the body develop and sustain strong bones. Most individuals obtain it through sunlight exposure, specific foods, or supplements. Recently, scientists have become increasingly interested in whether vitamin D also supports brain health, especially as people age.

    Research suggests that vitamin D might impact memory, learning, and other cognitive functions, but many questions remain regarding the optimal amount needed for these benefits.

    A recent study conducted by Rutgers University focused on women aged 50 to 70 who were overweight or obese. This group was chosen because excess body fat can influence how vitamin D is stored and utilized in the body. The researchers aimed to determine if various daily doses of vitamin D could affect memory, learning capabilities, and reaction times over a year.

    Participants were divided into three groups. One group took 600 IU of vitamin D daily—the recommended daily dose for many adults. The second group received 2,000 IU, and the third was given 4,000 IU each day. All were also encouraged to pursue weight loss during the study.

    After one year, findings showed that women taking 2,000 IU daily outperformed the others on tests measuring memory and learning. This indicates that a moderate increase in vitamin D might support specific brain functions, particularly memory and the ability to learn new information.

    However, an unexpected concern emerged. Women taking 2,000 IU, especially those on 4,000 IU, demonstrated slower reaction times during testing. While slower responses might seem minor, they can significantly raise the risk of accidents—particularly in older adults who need quick reflexes to prevent falls or injuries.

    Previous research aligns with these findings, indicating that high doses of vitamin D (such as 2,000 IU or more daily) could increase fall risks in older populations. The exact reasons for this are not fully understood, but the results underscore that more vitamin D isn’t necessarily better.

    This study raises important questions for future investigations. Scientists need to identify the safest, most effective vitamin D doses for cognitive health, explore if men and women respond differently, determine if slower reaction times directly lead to higher fall risks, and find which populations could benefit most from supplementation.

    The researchers emphasize that vitamin D is just one component of maintaining brain health. A healthy lifestyle is equally crucial—this includes eating nutritious foods, staying physically active, getting adequate sleep, and managing health conditions like high blood pressure and diabetes. Together, these habits promote healthy aging and can help reduce the risk of memory issues.

    Diets like the Mediterranean—rich in vegetables, fruits, whole grains, legumes, fish, olive oil, and healthy fats—have been associated with improved brain function and lowered dementia risk. Consuming foods high in fiber, B vitamins, and antioxidants may also help safeguard cognitive health as we age.

    This study was led by Sue Shapses from Rutgers University and published in The Journals of Gerontology: Series A.

    The findings suggest that while vitamin D might support memory, excessive doses could bring unwanted effects. Like many nutrients, vitamin D appears most beneficial when consumed in appropriate amounts rather than at the highest levels possible.

    For those interested in brain health, it’s worthwhile to explore research on vitamin B9 deficiency linked to increased risk of dementia, and the potential protective effects of flavonoid-rich foods.

    Additionally, recent studies indicate that cranberries may boost memory, and that consuming alcohol, coffee, and tea can influence cognitive decline.

    © 2026 Knowridge Science Report. All rights reserved.

  • Certain Supplements Could Reduce Your Body’s Optimal Vitamin D Levels

    Certain Supplements Could Reduce Your Body’s Optimal Vitamin D Levels

    Credit: Unsplash+

    Vitamin D is a crucial nutrient essential for overall human health. It aids in calcium absorption, helps maintain strong bones and muscles, and supports the immune system’s function.

    During winter months, many individuals supplement with vitamin D because natural production decreases when sunlight is limited.

    In nations like the United Kingdom, health authorities advise taking vitamin D supplements from October through March, as weaker sunlight results in reduced natural vitamin D synthesis through the skin.

    Two primary forms of vitamin D supplements are available: vitamin D2 and vitamin D3. Historically, both were viewed as beneficial ways to boost vitamin D levels.

    Recent studies from the University of Surrey, the John Innes Centre, and Quadram Institute Bioscience, however, suggest that these two forms may not function the same inside the body.

    The research indicates that taking vitamin D2 supplements could potentially lower vitamin D3 levels in the body. Since vitamin D3 is the more effective form naturally produced when skin is exposed to sunlight, this finding is significant.

    Experts believe that vitamin D3 more efficiently raises and maintains overall vitamin D levels compared to vitamin D2.

    This research was published in the journal Nutrition Reviews. Scientists analyzed data from multiple randomized controlled trials, regarded as some of the most reliable methods of medical research.

    The studies compared individuals supplementing with vitamin D2 to those not taking it at all.

    The pattern was clear: those taking vitamin D2 often experienced reductions in their vitamin D3 levels. In some instances, vitamin D3 dropped even below levels seen in control groups that did not take D2 supplements.

    Lead researcher Emily Brown from the University of Surrey explained that these findings reveal a previously unknown effect of D2 supplementation. She emphasized that vitamin D supplements are still vital, especially during the winter when sunlight exposure is limited.

    However, the evidence suggests that vitamin D3 supplements might offer greater benefits for many individuals.

    Vitamin D deficiency is a widespread health issue globally. Low levels have been connected to weak bones, muscle weakness, fatigue, and increased fracture risk. Researchers are also exploring how vitamin D impacts immune responses, inflammation, and susceptibility to infections.

    This latest research supports earlier findings published in Frontiers in Immunology, indicating that vitamin D2 and D3 may influence the immune system differently.

    Professor Colin Smith from the University of Surrey noted that vitamin D3 seems to activate a specific immune pathway called type I interferon signaling, which serves as an early line of defense against bacteria and viruses.

    According to Professor Smith, maintaining healthy vitamin D3 levels might help prevent infections by stopping viruses and bacteria from establishing themselves in the body. The study did not observe similar immune benefits with vitamin D2.

    This growing body of evidence points to vitamin D3 possibly playing a more critical role in immune protection than D2, especially during flu season and other times when respiratory infections are common.

    The research also raises questions about plant-based sources of vitamin D. Traditionally, vitamin D2, derived from fungi and yeast, has been used in vegan and vegetarian supplements. Conversely, vitamin D3 has historically been sourced from animal products like lanolin from sheep wool.

    But scientists now stress the importance of expanding options for plant-based vitamin D3 so vegetarians and vegans can benefit from what may be the more effective form of supplementation.

    Professor Cathie Martin from the John Innes Centre emphasized the need for increased availability of plant-derived vitamin D3 products in the UK.

    These findings could influence future health guidelines and supplement recommendations. Still, individual needs vary, and some people might require different types of vitamin D based on their health conditions, diet, age, or other factors.

    Experts caution against stopping prescribed supplements abruptly without consulting healthcare providers. Despite these new insights, vitamin D deficiency remains a major health concern, and both forms of supplementation can still help improve vitamin D levels compared to not taking any.

    Professor Martin Warren from the Quadram Institute Bioscience stated that vitamin D deficiency still affects many, especially during winter, and that identifying the most effective supplement form is key for improving public health.

    More research is necessary to understand the full biological differences between vitamin D2 and D3, including their impacts on immunity, long-term health, and disease prevention.

    In summary, these findings highlight that vitamin D supplementation is more complex than it appears. Although D2 and D3 may seem similar on store shelves, their roles inside the body could differ significantly.

    If you’re interested in nutrition, don’t miss studies on berries that may help prevent cancer, diabetes, and obesity, as well as the risks associated with vitamin D deficiency.

    For additional health insights, explore recent studies regarding potatoes and high blood pressure, and discover why turmeric could be a major breakthrough for health.

  • Can Vitamin D Help Prevent Diabetes?

    Can Vitamin D Help Prevent Diabetes?

    Prediabetes is a widespread health issue across the United States. It occurs when blood sugar levels are elevated but not high enough to be classified as diabetes. Many individuals with prediabetes experience no symptoms, so they might be unaware of their condition.

    Over time, prediabetes can progress to type 2 diabetes, a serious illness that can impact the heart, kidneys, eyes, and nerves. A recent study offers an optimistic perspective: it indicates that vitamin D, an affordable and commonly available supplement, may help lower the risk of developing diabetes. However, this potential benefit appears to vary based on a person’s genetic makeup.

    The research was published in JAMA Network Open and conducted by scientists at Tufts University, led by Bess Dawson-Hughes. They analyzed data from the D2d trial, involving over 2,000 U.S. adults with prediabetes. In the original trial, participants received either a high dose of vitamin D—4,000 units daily, significantly above typical daily recommendations—or a placebo. The aim was to evaluate whether vitamin D could prevent the onset of diabetes.

    Initially, the overall results were inconclusive; vitamin D did not significantly reduce diabetes risk across the entire group. But the researchers dug deeper. They questioned whether specific subgroups might benefit more.

    By examining genetic information from the participants, particularly focusing on a gene linked to the vitamin D receptor—a “lock” that vitamin D must fit into to activate its functions—they identified notable differences. This receptor influences how vitamin D helps regulate processes like blood sugar management.

    Findings showed that about 30% of the participants had a particular gene variant called the AA type. These individuals did not experience any protection from vitamin D supplementation concerning diabetes risk. Conversely, those with other variants (AC or CC) did see benefits—about 19% lower risk of developing diabetes when taking vitamin D compared to placebo.

    This discovery emphasizes that a simple supplement might be highly effective for some, but not for others, supporting the growing movement toward personalized medicine. Instead of generic treatments, future healthcare could involve genetic testing to tailor preventive strategies.

    The study also sheds light on why previous research on vitamin D’s role in preventing diabetes has yielded mixed results—benefits seem to depend on individual genetics. Nonetheless, experts warn against self-medicating with high-dose vitamin D, as excessive intake can pose health risks, including bone issues and falls in older adults. Current guidelines recommend much lower daily doses for most people.

    While the study’s strengths include its large size, rigorous design, and genetic analysis, it also has limitations. Additional studies are needed to confirm these findings across diverse populations and to understand the long-term effects of high-dose vitamin D.

    Overall, this research marks an important step toward more personalized healthcare, suggesting that genetic testing could identify who might benefit most from vitamin D to delay or prevent diabetes.

    For those interested in nutrition, it’s worth exploring the risks of vitamin D deficiency and how the Mediterranean diet may help preserve brain health in older adults. Stay informed with recent studies on natural ways to lower high blood pressure and simple dietary changes to manage type 2 diabetes.

  • Does Vitamin D Reduce Alzheimer’s Biomarkers? A Closer Look

    Does Vitamin D Reduce Alzheimer’s Biomarkers? A Closer Look

    Dementia remains one of the most daunting health concerns associated with aging. It impacts memory, cognition, and independence, affecting not only individuals but also their families and communities alike.

    Researchers have long sought ways to prevent or slow the progression of dementia, and recent findings suggest that a simple nutrient—vitamin D—might play a role.

    Published in Neurology Open Access, the study examined how vitamin D levels in early adulthood could be linked to brain changes observed years later. Known as the “sunshine vitamin,” vitamin D is produced by the body when skin is exposed to sunlight and can also be obtained through certain foods and supplements.

    The research involved 793 participants with an average age of 39 at the start. None of these individuals had dementia when the study began. The scientists measured their blood vitamin D levels and monitored them over time.

    Approximately 16 years later, brain scans were performed to look for two proteins associated with Alzheimer’s disease: tau and amyloid beta. Tau proteins form twisted fibers inside brain cells, while amyloid beta accumulates as plaques outside cells. Both are key indicators of brain aging and neurodegenerative disease.

    The findings revealed a notable pattern: individuals with higher vitamin D levels in midlife tended to have lower levels of tau protein in their brains later on, indicating a potential link between vitamin D status and healthier brain aging. However, no correlation was found between vitamin D levels and amyloid beta.

    To ensure accuracy, the researchers adjusted their results for factors such as age, gender, and depression. While promising, these results should be approached with caution. The study demonstrates a correlation, not a cause-and-effect relationship. Other lifestyle choices—like diet or outdoor activity—could also influence both vitamin D levels and brain health.

    A limitation of the research was that vitamin D was only measured once, so the scientists couldn’t analyze changes in levels over time or confirm long-term exposure.

    Despite these constraints, the study underscores an important concept: lifestyle choices made in midlife can impact brain health decades down the line. This period could represent a vital window for intervention through straightforward, manageable adjustments.

    Experts recommend maintaining adequate vitamin D—through safe sun exposure, diet, or supplements—under medical supervision to potentially support brain health.

    While vitamin D isn’t a guaranteed safeguard against dementia, it may be an important element in a broader strategy for prevention. Additional research is needed to verify these findings and explore how vitamin D interacts with other biological factors.

    For now, the message is hopeful: small, early-life steps could help preserve brain function long-term. If you’re concerned about cognitive health, consider reading about the links between vitamin D deficiency and Alzheimer’s or vascular dementia, and explore how increasing magnesium intake might also benefit brain resilience.

    For further information about brain wellness, look into recent research on antioxidants that could reduce dementia risk, and consider whether incorporating coconut oil might help improve cognitive function in individuals with Alzheimer’s.

  • Vitamin D2 Supplements Could Reduce Body’s Natural D3, Study Shows

    Vitamin D2 Supplements Could Reduce Body’s Natural D3, Study Shows

    Credit: Unsplash+


    Vitamin D is often called the “sunshine vitamin” because our bodies produce it when skin is exposed to sunlight.

    It plays a vital role in keeping our bones strong and supporting proper immune system function. In many countries, especially those with long winters and limited sunlight, people are encouraged to take vitamin D supplements to keep their levels healthy.

    For instance, in the United Kingdom, the government recommends that individuals consume 10 micrograms of vitamin D daily, particularly from October to March when sunlight is too weak for the body to make enough vitamin D naturally. This advice leads many to rely on supplements to promote their health.

    Recent research indicates that not all vitamin D supplements work equally. Scientists from the University of Surrey, the John Innes Centre, and the Quadram Institute Bioscience have found that one common form of vitamin D supplement could actually lower the levels of the most effective form of vitamin D in the body.

    The study, published in the journal Nutrition Reviews, examined two types of vitamin D supplements: vitamin D2 and vitamin D3. Both are widely available and are used to help maintain adequate vitamin D levels.

    Vitamin D2 typically comes from plant sources and fungi, while vitamin D3 is usually derived from animal products or produced in the skin through sunlight exposure.

    For many years, both forms have been considered acceptable for increasing vitamin D intake. However, the new findings suggest that vitamin D2 might not be as beneficial as once thought.

    The researchers reviewed data from multiple controlled trials where participants received either vitamin D2, D3, or a placebo. These detailed studies help determine true effects by comparing outcomes between groups.

    By analyzing these combined results, the researchers found something surprising: individuals taking vitamin D2 often experienced a decrease in their vitamin D3 levels, which is the form most naturally produced and utilized by the body.

    In some cases, vitamin D3 levels in those taking D2 dropped below levels seen in individuals not taking any supplement at all. This suggests vitamin D2 might interfere with the body’s natural vitamin D3 levels.

    Emily Brown, a PhD researcher and lead author of the study from the University of Surrey’s Nutrition, Exercise, Chronobiology and Sleep research group, emphasized the significance of these findings.

    She explained that vitamin D supplements remain crucial during months when sunlight is insufficient for natural production. Still, this research highlights that vitamin D2 could potentially decrease vitamin D3 levels, a factor not fully appreciated before.

    Given this, many experts recommend vitamin D3 supplements for optimal health, though individual needs should always be taken into account.

    The study also underscores the increasing availability of plant-based vitamin D3 options. Professor Cathie Martin from the John Innes Centre pointed out that improving access to such alternatives could benefit vegetarians and vegans seeking effective supplementation.

    This research supports earlier studies, including one published in Frontiers in Immunology by Professor Colin Smith from the University of Surrey, which indicated that vitamin D3 might influence immune responses differently than vitamin D2.

    Specifically, D3 seems to activate a key component of the immune system called the type I interferon signaling pathway, crucial in defending the body against viruses and bacteria.

    The evidence suggests vitamin D3 may help boost immune defenses, whereas vitamin D2 appears less effective in this regard.

    Since vitamin D is integral to overall health, understanding the differences between its forms is critically important. Deficiency in vitamin D is already a major public health concern, especially in areas with limited sunlight during winter months.

    Professor Martin Warren, Chief Scientific Officer at the Quadram Institute, highlighted that enhancing vitamin D levels across populations is a key health priority.

    He added that many in the UK suffer from low vitamin D, particularly during colder seasons, making it essential to find the most effective ways to supply vitamin D through supplements or fortified foods.

    Overall, the findings suggest that vitamin D3 may be more effective than D2 in improving and maintaining healthy vitamin D levels. The research also raises important questions about how different forms of vitamin D interact within the body and influence health outcomes.

    However, further research is necessary to explore how vitamin D2 might reduce D3 levels long-term and what implications that could have for overall health.

    In conclusion, this study offers valuable insights into vitamin D supplementation, indicating that vitamin D3 might provide greater benefits for most individuals. Better understanding of these differences will help healthcare providers, nutritionists, and policymakers develop more effective recommendations for maintaining optimal vitamin D status.

    If you’re interested in health, explore recent studies on the best times to take vitamins to prevent heart disease or how vitamin D supplements could significantly cut cancer mortality.

    For additional health insights, check out studies on plant nutrients that help lower high blood pressure and antioxidants that may reduce the risk of dementia.

    Copyright © 2026 Knowridge Science Report. All rights reserved.


  • Potential Hidden Risk in Vitamin D2 Supplements

    Potential Hidden Risk in Vitamin D2 Supplements

    Credit: Unsplash+


    Vitamin D ranks among the most popular dietary supplements worldwide. Many individuals supplement with it to strengthen bones, boost immunity, and promote overall well-being.

    This vitamin becomes especially crucial during the winter months when sunlight exposure decreases, and the body’s natural production diminishes.

    Our bodies primarily produce vitamin D when UV rays from sunlight hit our skin, triggering a process that generates vitamin D3. This form is often regarded as the most natural and effective because it’s the same type our bodies create naturally.

    However, during periods of limited sunlight or when people spend most of their time indoors, vitamin D production may fall short. That’s why doctors frequently recommend supplements, especially in colder seasons.

    Recent research indicates that not all vitamin D supplements work equally in the body.

    Researchers from the University of Surrey, the John Innes Centre, and the Quadram Institute Bioscience recently examined two common forms: vitamin D2 and vitamin D3.

    Both are readily available at pharmacies and health stores. Many assume they are equally effective, but the new study suggests otherwise.

    The team analyzed data from multiple clinical trials to see how these supplements influence blood vitamin D levels. They specifically looked at how D2 and D3 affect circulating vitamin D in the bloodstream.

    The results were unexpected.

    Participants taking vitamin D2 showed a decrease in their blood levels of vitamin D3. This indicates that while the supplement adds D2, it might also suppress the more beneficial D3.

    Vitamin D3 is important because it’s the form naturally produced through sunlight exposure and is generally deemed more effective at maintaining optimal vitamin D levels.

    In several analyzed trials, individuals taking D2 ended up with lower D3 levels compared to those not taking any vitamin D supplement.

    This suggests that D2 might not support vitamin D status as well as D3 does.

    Lead researcher Dr. Emily Brown from the University of Surrey explained that vitamin D supplements are especially vital during winter. In countries like the UK, sunlight from October to March is often too weak for our bodies to generate enough vitamin D naturally.

    Because of this, health authorities recommend supplementation during these months.

    However, the study emphasizes that the kind of supplement matters.

    “Our research shows that vitamin D2 supplements can actually lower vitamin D3 levels in the body,” said Dr. Brown. “This implies that vitamin D3 might be the better choice for those looking to boost their vitamin D levels.”

    The findings align with earlier research indicating distinct behaviors of D2 and D3 within the body.

    In a prior study published in Frontiers in Immunology, scientists at the University of Surrey found that vitamin D3 activates a crucial part of the immune system called the type I interferon signaling pathway.

    This immune component helps defend against bacteria and viruses. The study observed that D3 stimulated this response, whereas D2 lacked the same effect.

    Having adequate vitamin D levels supports many health areas. It aids calcium absorption necessary for strong bones and teeth, contributes to muscle function, enhances immune responses, and helps reduce inflammation.

    Despite its importance, vitamin D deficiency remains widespread, especially during winter when sun exposure drops.

    Professor Martin Warren from the Quadram Institute Bioscience highlighted that selecting the most effective form of vitamin D could improve public health outcomes. Proper supplementation may help decrease deficiency rates across populations.

    Professor Cathie Martin from the John Innes Centre added that expanding plant-based sources of vitamin D3 could make the vitamin more accessible, especially for vegetarians and vegans.

    Although vitamin D3 appears to have advantages, researchers emphasize that further studies are necessary to fully understand the differences between D2 and D3.

    Based on current evidence, D3 seems to be the preferable choice for maintaining healthy vitamin D levels.

    If you’re interested in nutrition, check out studies explaining why vitamin K is vital for older adults, or learn about a snack that may affect your heart rhythm.

    For additional health insights, explore recent research on vitamins that could reduce the risk of type 2 diabetes, or see findings indicating that common food chemicals might influence blood pressure.

    This research was published in the journal Nutrition Reviews.

    Copyright © 2026 Knowridge Science Report. All rights reserved.