Nutritional supplements
Learning Center
Yeast infection in men: How can I tell if I have one?
Yeast infections can occur in men, causing inflammation of the penis (balanitis). Learn what signs and symptoms could mean you have a yeast infection.
Withdrawal method (coitus interruptus)
The withdrawal method — pulling the penis out of the vagina before ejaculation — isn't the most effective birth control. Learn about the pros and cons.
Winter blahs? 4 pro tips to get you off the couch.
Struggling to stay active in winter? We've got you covered with some inside tips and strategies that'll help you keep moving.
Wheezing in children: Could it be asthma?
Wheezing in children may be a sign of asthma — but not always.
What it takes to be agile at any age
It's never too late to start thinking about flexibility and mobility. Use these tips to stay agile well past middle age.
What is wheatgrass? Why is it in my drink?
Wheatgrass is a popular addition to smoothies and other drinks. While it's a rich source of nutrients, it's not a disease cure-all.
Want to stay hydrated? Drink before you're thirsty
Did you know you're already dehydrated when you start to feel thirsty? Don't wait to take a drink. Instead, practice these simple tips to master a hydration habit that lasts for life.
Vitamin D toxicity: What if you get too much?
Understand the risks of too much vitamin D, including a toxic reaction.
Vitamin D for babies: Are supplements needed?
A Mayo Clinic specialist explains why, when and how to give your baby vitamin D.
Vitamin D deficiency
What are the risks of too little vitamin D?
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