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Metformin pills
Drug Side Effects

Can Metformin Result in Vitamin B12 Deficiency?

A reader finds that taking metformin results in vitamin B12 deficiency with effects on eyesight. Ask the prescriber to check on your vitamin status.

vitamin D3 pills
Drug Side Effects

Do Vitamin D3 Pills Cause Digestive Distress?

When sunshine is limited, you may need vitamin D3 pills to bring your level of this hormone up to normal. However, some people report digestive symptoms.

Green round rubber stamp with vitamin B12 text
Burning Tongue

Vitamin B12 Lack Led to Balance and Memory Problems

A serious vitamin B12 lack due to PPI medication, vegan diet, or stomach inflammation can cause trouble with balance, cognition and fatigue.

hands holding nail clippers demonstrates strong nails
Home Remedies

What Are the Pros and Cons of Biotin for Strong Nails?

Many people take biotin for strong nails, although there is limited scientific support for this use of the supplement. Can biotin interfere with tests?

Metformin Prescription Pills With Identification Numbers
Depression

Is Depression Linked to Metformin for Diabetes?

A possible vitamin B12 deficiency could explain depression linked to metformin for blood sugar control. An additional supplement might help.

confused older man
Alzheimer’s Disease

Are You Suffering Senility or Vitamin B12 Deficiency?

Symptoms of a vitamin B12 deficiency may mimic senility, with poor concentration, constipation, balance problems and tingling or numbness in hands or feet.

vitamin D capsules
Heart Attack

Forget Vitamin D Supplements for Heart Disease

A meta-analysis in JAMA Cardiology shows no benefit from vitamin D supplements for heart disease. This is the latest in a series of such disappointments.

confused older man
Cognitive Dysfunction

Vitamin B12 Deficiency Can Cause Cognitive Problems

Older people are at risk for vitamin B12 deficiency, which can lead to cognitive difficulties. Certain medications and a vegetarian diet increase the risk.

bright sun shining
Home Remedies

Is Sunshine the Best Source for Vitamin D?

The best source for vitamin D is the one that is available. That might be sunshine, or it might be supplements. Magnesium and vitamin K2 are also useful.

close up of a wood mouse
Home Remedies

Rat Poison Is Not Relevant to People

Even though vitamin D can be used as rat poison, that doesn't mean all supplements are risky for people. Get the right dose.

vitamin D capsules
Vitamin Deficiency

Is Vitamin D3 Really a Mouse and Rat Poison?

Millions of people are deficient in vitamin D. Without a blood test you wouldn't know if you are one of them. What about too much vitamin D? Is it a danger?

a man shaking pills into his hand from a bottle
Home Remedies

Should You Take Magnesium to Boost Vitamin D?

If your vitamin D level is low, you can use magnesium to boost vitamin D. You might also need to take supplemental vitamin D.

Vitamin D3 gel capsules
Home Remedies

How Will You Get Adequate Vitamin D?

Do you need to take supplements to get adequate vitamin D? People who live in northern regions may need supplements during the winter.

Vitamin D3 gel capsules
Cancer

Study of Vitamin D Supplements Results in Disappointment

A study of vitamin D supplements demonstrated that these pills do not protect people from heart disease or cancer.

vitamin D capsules
Cancer

Vitamin D Strikes Out Against Heart Attacks and Cancer

In the VITAL trial, vitamin D strikes out for preventing heart disease and cancer. Are such supplements completely useless?

Walter Willett, MD, DrPH, Chairman of Nutrition Harvard University
Podcasts

Show 1139: Will Supplements Keep Your Bones Strong?

Don't count on vitamin D and calcium pills to keep your bones strong. Make sure you get plenty of green veggies in your diet and spend some time in the sun.

Woman with severe rheumatoid arthritis holding camera taking a photo
Home Remedies

How Are Vitamin D and Rheumatoid Arthritis Linked?

Spanish researchers found that rheumatoid arthritis patients with low vitamin D levels have more involved joints and more joint pain than those with adequate levels.

a female cancer patient with no hair
Cancer

Do Vitamin D Pills Lower Your Chance of Cancer?

A study from New Zealand showed no reduction in the chance of cancer for people taking pills with 100,000 IU of vitamin D each month.

Vitamin B12 in a syringe ready for injection with vials in the background
Anemia

Do You Know Your Vitamin B12 (Cobalamin) Levels?

Have you ever been tested for vitamin B12? Do you know the symptoms of a deficiency? This nutrient is essential for good health. Several drugs can lead to low levels. Are you taking one?

vitamin D capsules
Cancer

Will Vitamin D Pills Help You Avoid Cancer?

Those who cannot get adequate vitamin D from sun exposure should take vitamin D pills. Scientists have not yet determined, however, if such supplements can protect people from cancer.