By: Terry Graedon July 3, 2022 27 Comments
    Can You Overdose on Vitamin D?

    Doctors generally assume that North Americans are so well nourished that they never need to worry about supplements. In fact, they sometimes fuss that people who take vitamin pills could overdose on …

    By: Terry Graedon June 23, 2022 4 Comments
    Low Vitamin D Levels Linked to Risk of Alzheimer…

    Most vitamins must come from our food (or supplements) because we don't make them ourselves. Vitamin D is an exception, because our skin makes the precursor to this hormone when we expose ourselves to…

    By: Terry Graedon January 17, 2022 7 Comments
    Will a Big Dose of Vitamin D Give You Leg Cramps…

    What have you heard about vitamin D? Maybe you recognize this compound by its popular nickname, the "sunshine vitamin." It is called that because human skin makes this hormone when it is exposed to su…

    By: Terry Graedon October 7, 2021 22 Comments
    Are You Suffering Senility or Vitamin B12 Defici…

    Whether they admit it or not, a lot of middle-aged and older people worry about senility. By this, they mean cognitive difficulties or even dementia, perhaps coupled with physical frailty. However, ge…

    By: Terry Graedon August 30, 2021 0 Comments
    How Does Metformin Affect Vitamin D Status?

    Millions of people take metformin, a versatile drug. Since it reduces insulin resistance, doctors often prescribe to people with type 2 diabetes to help with blood sugar control. However, oncologists …

    By: Terry Graedon August 19, 2021 15 Comments
    How Much Vitamin C Do You Need?

    Vitamin C, isolated and named more than 100 years ago, is crucial for good health. Even before it was discovered, vitamin C entered history. A lack of fresh fruits and vegetables on long sea voyages m…

    By: Joe Graedon July 8, 2021 26 Comments
    Do You Know Your Vitamin B12 (Cobalamin) Levels?

    Most people do not think much about Vitamin B12, also known as cobalamin. It does not get the same attention as vitamin D, vitamin K or vitamin C. And yet this water-soluble nutrient is crucial for ev…

    By: Joe Graedon May 9, 2021 13 Comments
    Is Vitamin Deficiency at the Bottom of Burning S…

    What could cause a burning sensation on the bottoms of the feet? This symptom seems to indicate nerve damage, technically termed peripheral neuropathy. There are a number of potential causes, ranging …

    By: Terry Graedon December 17, 2020 8 Comments
    Show 1240: The Link Between Vitamin D and COVID-…

    Scientists have long suspected that vitamin D is crucial for the immune system to function properly. Presumably, that is why cod liver oil was utilized as a tonic to ward off colds and flu in northern…

    By: Terry Graedon October 12, 2020 5 Comments
    Do Your Medicines Suppress Your Vitamin D?

    People who are interested in keeping their immune system functioning well–and who isn't, these days–know that vitamin D is critical. But how can you make sure that your level of the sunshine vitam…

    By: Terry Graedon August 31, 2020 1 Comments
    Can Prilosec Interfere With Vitamin B12 Injectio…

    Have you ever heard of pernicious anemia? This rare condition is an autoimmune disorder in which the immune system attacks parietal cells in the stomach. These cells secrete a substance, mysteriously …

    By: Joe Graedon July 20, 2020 6 Comments
    Were We Wrong About Sunscreens and Vitamin D For…

    For years we have warned readers that liberal use of sunscreen could prevent the body from making adequate amounts of vitamin D. We didn’t make that up. Dr. Michael Holick is an expert on vitamin D.…

    By: Terry Graedon June 29, 2020 21 Comments
    Can Vitamin B12 Prevent Recurrent Canker Sores?

    What do you for canker sores? Most of us get these painful lesions inside the cheek or on the tongue occasionally. They cause misery for a few days and then they disappear. But some individuals suffer…

    By: Terry Graedon June 11, 2020 3 Comments
    What Immunity-Boosting Nutrients Are You Missing…

    Are you getting the nutrients you need to stay healthy and keep your immune system functioning optimally? Frequently health care professionals dismiss the need for supplemental vitamins or minerals. T…

    By: Terry Graedon May 14, 2020 13 Comments
    Will Vitamin D Help You Avoid Infection?

    Does vitamin D improve resistance against the SARS-CoV-2 virus that causes COVID-19? British researchers suggest that adequate vitamin D levels might help people avoid infection. They caution, though,…

    By: Terry Graedon January 6, 2020 16 Comments
    Do Vitamin D3 Pills Cause Digestive Distress?

    Vitamin D is a crucial compound. When levels of this vitamin (which is also a hormone) are low, people are more prone to strokes or heart attacks, diabetes, COPD, macular degeneration and a number of …

    By: Terry Graedon December 2, 2019 5 Comments
    Vitamin B12 Lack Led to Balance and Memory Probl…

    If you have experienced trouble with your balance, you might have told yourself you're getting older. (Always true, but not always an explanation.) Or perhaps you have attributed a parent's forgetfuln…

    By: Terry Graedon November 18, 2019 15 Comments
    What Are the Pros and Cons of Biotin for Strong …

    Biotin is a naturally occurring vitamin found in foods such as beef liver, eggs, salmon or pork. Some plants are also good sources of biotin, although levels are lower in sunflower seeds, sweet potato…

    By: Terry Graedon September 2, 2019 2 Comments
    Is Depression Linked to Metformin for Diabetes?

    Doctors and patients both may have a hard time determining when a new health concern is actually a side effect. That's especially difficult when you don't find the problem on any official list of drug…

    By: Terry Graedon June 20, 2019 5 Comments
    Forget Vitamin D Supplements for Heart Disease

    Vitamin D supplements disappoint again. That’s the conclusion of a meta-analysis published in JAMA Cardiology this week. The researchers noted that many epidemiological studies have linked low vitam…

    By: Terry Graedon June 17, 2019 20 Comments
    Vitamin B12 Deficiency Can Cause Cognitive Probl…

    As people grow older, they may begin to have difficulty with memory or complex cognitive tasks. The family might chalk the problem up to encroaching dementia due to aging. In some cases, though, cogni…

    By: Terry Graedon March 11, 2019 2 Comments
    Is Sunshine the Best Source for Vitamin D?

    Vitamin D has long been known as the sunshine vitamin because skin creates this hormone when exposed to ultraviolet light. However, winter in northern latitudes does not allow much vitamin D to be cre…

    By: Terry Graedon February 25, 2019 9 Comments
    Rat Poison Is Not Relevant to People

    We recently answered a question from a reader about vitamin D3 used in high concentrations as a mouse or rat poison. At the toxic levels found in the bait, vitamin D3 can lead to kidney damage, heart …

    By: Joe Graedon January 28, 2019 12 Comments
    Is Vitamin D3 Really a Mouse and Rat Poison?

    Vitamin D3 is one of the most popular vitamins in the pharmacy these days. That’s because a lot of people are low in vitamin D. Vitamin D3 is often considered to be the best supplement to replenish …

    By: Terry Graedon December 31, 2018 30 Comments
    Should You Take Magnesium to Boost Vitamin D?

    We don't usually think of nutritional supplements acting in concert, but that is due to a failure of imagination. Food hardly ever supplies a single nutrient. A reader recently alerted us to an intere…

    By: Terry Graedon December 17, 2018 7 Comments
    How Will You Get Adequate Vitamin D?

    You may have heard that vitamin D is known as the sunshine vitamin. That is because skin exposed to sunlight makes this crucial hormone. However, when nights are long and days are short and cold, we c…

    By: Terry Graedon November 19, 2018 34 Comments
    Study of Vitamin D Supplements Results in Disapp…

    Millions of Americans are low in vitamin D, but taking vitamin D supplements may not do any good. A study of vitamin D supplements recently published in The New England Journal of Medicine (online, No…

    By: Terry Graedon November 15, 2018 49 Comments
    Vitamin D Strikes Out Against Heart Attacks and …

    Millions of Americans are low in vitamin D. They are at higher risk for a range of health problems, from asthma to osteoporosis, hypertension, rheumatoid arthritis and cancer. These individuals may b…

    By: Terry Graedon October 18, 2018 23 Comments
    Show 1139: Will Supplements Keep Your Bones Stro…

    For years, people were urged to take calcium supplements to avoid losing bone density. This advice was aimed particularly at menopausal and postmenopausal women because they are especially susceptible…

    By: Terry Graedon August 2, 2018 6 Comments
    How Are Vitamin D and Rheumatoid Arthritis Linke…

    Vitamin D (the sunshine vitamin) is essential for good health. Human beings can make this hormone when skin is exposed to sunlight. In addition, vitamin D is found in a few foods: oily fish (and espec…

    By: Terry Graedon July 18, 2018 9 Comments
    Do Vitamin D Pills Lower Your Chance of Cancer?

    Epidemiological studies have shown that people with low levels of vitamin D are more susceptible to various cancers. What can you do to reverse your risk? The answer is not clear.  We do not know if …

    By: Terry Graedon June 18, 2018 3 Comments
    Will Vitamin D Pills Help You Avoid Cancer?

    New research strongly suggests that people with too little vitamin D in their systems are more likely to get colorectal cancer (McCullough et al, Journal of the National Cancer Institute, June 14, 201…

    By: Terry Graedon May 20, 2018 13 Comments
    Could Vitamin B12 Deficiency Make You Fall?

    Falls are a great fear as people get older and less steady on their feet. And no wonder: a fall can result in broken bones and greatly reduced mobility. More than a fourth of older adults who break a …

    By: Terry Graedon March 8, 2018 2 Comments
    Extra Summer Sunshine Makes for Milder Flu Seaso…

    Extra end-of-summer sunshine might mitigate the flu season that follows, according to a new study (National Bureau of Economic Research, Feb., 2018). Scientists found that when a state gets 10 percent…

    By: Terry Graedon October 30, 2017 3 Comments
    Which Drugs Mess with Vitamin B12?

    Keeping track of the nutritional consequences of medications can be tricky. Doctors don't always ask about possible problems; nor do pharmacists necessarily take these into account. But there are some…

    By: Terry Graedon October 9, 2017 8 Comments
    How to Raise Vitamin D with Sunshine and Cod Liv…

    Vitamin D is known as the sunshine vitamin because we make it when ultraviolet light from the sun strikes the skin. This compound behaves like a hormone. Numerous physiological functions depend heavil…

    By: Terry Graedon August 14, 2017 4 Comments
    Is There a Cure for Concave Fingernails?

    Have you ever looked at your fingernails and wondered why they look the way they do, with ridges or streaks or splits? Often, there is not a specific answer to such a question. There are, however, a f…

    By: Terry Graedon August 7, 2017 16 Comments
    Is Your Confusion Due to a Vitamin Deficiency?

    As we grow older, our mental lapses bother us more and more. Could losing the car keys be the first sign of Alzheimer's disease? Is forgetting the PIN for the ATM an early warning flag for dementia? O…

    By: Terry Graedon August 7, 2017 11 Comments
    Can You Get All Your Vitamins from Your Diet?

    Do you take vitamin pills? How do you know you are getting all your vitamins? What about the time-honored advice to get the vitamins you need from your diet? Many doctors offer this advice. How well d…

    By: Terry Graedon July 6, 2017 9 Comments
    Too Little Vitamin D Could Be Deadly

    Low levels of vitamin D in the blood are linked to increased mortality. That is the conclusion of a large population-based Norwegian study. How did they discover that too little vitamin D might be dea…