Nutritional supplements
Learning Center
Stool color: When to worry
Stool color is usually a result of diet and is only rarely a concern.
Sleep deprivation: A cause of high blood pressure?
Too little sleep affects not only energy levels but also heart health.
Sinus infection and toothache: Any connection?
Sometimes the cause of a toothache isn't a tooth problem, but a sinus problem.
Semen allergy: A cause of infertility?
Semen allergy, also called seminal plasma hypersensitivity, is a rare condition that can be easily misdiagnosed. Learn about symptoms and possible treatments.
Secondary infertility: Why does it happen?
Second pregnancies don't always come easily. Learn about possible causes for secondary infertility and when to seek professional help.
Recurrent prostate infection: What are the treatment options?
These infections that keep coming back can be hard to treat. Here's what to know.
Probiotics and prebiotics: What you should know
Probiotics are foods or supplements that contain 'good' bacteria that might help treat or prevent illness. Should they be part of your diet?
Prenatal vitamins: OK for women who aren't pregnant?
Prenatal vitamins: Why they might not be suitable if you're not pregnant.
Omega-6 fatty acids: Can they cause heart disease?
This essential fatty acid is found in certain foods and is recommended as part of a healthy diet.
Nocturnal panic attacks: What causes them?
Nighttime panic attacks can cause sweating, rapid heart rate, trembling, shortness of breath, heavy breathing, flushing or chills. Learn about treatment.
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