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Learning Center
Tetanus shots: Is it risky to receive 'extra' boosters?
For adults, tetanus shots are recommended every 10 years.
Calcium supplements: When should they be taken?
Timing matters when taking these supplements. Learn how to take them.
Can vitamins help prevent a heart attack?
Study results are mixed on whether vitamins can prevent heart disease. Find out more.
Arcus senilis: A sign of high cholesterol?
With this condition, older adults develop a gray arc around the cornea of the eyes.
Loss of taste and smell: Natural with aging?
Aging can play a role in the loss of taste and smell — but not always.
Low blood sodium in older adults: A concern?
For older adults, low blood sodium, known as hyponatremia, can cause death if left untreated.
Did the definition of Alzheimer's disease change?
What the change in the research definition of Alzheimer's disease means for you.
Why isn't there a hepatitis C vaccine?
Hepatitis C vaccine development is far from straightforward, but experimental vaccines are under study.
Does older age increase the risk of atrial fibrillation?
Learn how the risk of getting this common heart rhythm condition can increase with age.
What are superbugs and how can I protect myself from infection?
Some bacteria and other germs are resistant to most types of antibiotics and medicines that treat them. Find out the risks and how to prevent infections.
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