Nutritional supplements
Learning Center
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.
Vitamin D toxicity: What if you get too much?
Understand the risks of too much vitamin D, including a toxic reaction.
Vitamin D deficiency: Can it cause high blood pressure?
Too little vitamin D is bad for the bones, but what about the heart? Learn how a low vitamin D level may affect blood pressure.
Vitamin D deficiency
What are the risks of too little vitamin D?
Unusual COVID-19 symptoms: What are they?
Find out about the unusual symptoms of coronavirus disease 2019 (COVID-19), including COVID toes, nausea, and loss of smell or taste.
Too much vitamin C: Is it harmful?
Vitamin C is an essential nutrient, but too much carries its own risks.
Thyroid guard: Do I need one during a mammogram?
A Mayo Clinic expert discusses using thyroid guards during mammograms to reduce the risk of thyroid cancer from radiation.
Thin skin? Added protection helps
Fragile or thin skin is a fairly common problem, especially in older adults.
Starting solids: When is the right time?
Understand when to start feeding your baby solid foods.
Silent heart attack: What are the risks?
This type of heart attack occurs with few, if any, symptoms. Find out more.
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