Medically reviewed by Soma Mandal, MD A vitamin D test is a blood test that measures the level of vitamin D (calciferol) in ...

Vitamin D supplementation may help manage hypertension, particularly in older adults with overweight or obesity, a new study ...

Vitamin D is a nutrient that helps the body take in calcium from the foods we eat. Calcium and vitamin D build bones and keep them strong. Vitamin D also plays a part in heart health, fighting ...

Our nutrition experts rigorously evaluated various vitamin D supplements for quality, dosage accuracy, safety, effectiveness, and more. Based on our comprehensive analysis and real customer ...

A new study reinforces the importance of vitamin D to health, especially as the onset of winter diminishes sunlight, the most effective way humans absorb the vitamin. The study, published in the ...

American Osteopathic Association. Researchers Find Low Magnesium Levels Make Vitamin D Ineffective. Lab Tests Online. Magnesium. The American journal of clinical nutrition. Magnesium status and ...

Higher doses of vitamin D3 supplementation did not significantly reduce cardiac biomarkers in older adults with low serum vitamin D levels. The STURDY trial found no significant differences in ...

Take vitamin D by mouth as directed. Vitamin D is best absorbed when taken after a meal but may be taken with or without food. Alfacalcidol is usually taken with food. Follow all directions on the ...