What are normal testosterone levels by age? An older photographer mentors a younger one. Testosterone is an important hormone. It helps men develop during puberty, and as they age, it plays a critical ...

For adults, a typical level of vitamin D in the blood is 20 nanograms per milliliter (ng/ml) or above. Levels of 12 ng/ml are too low and levels of 50 ng/ml are too high. High or low levels may affect ...

Dear Dr. Roach: All my friends who are hypertensive have been able to bring their blood pressure to 120/80 or less. However, I have diabetic friends who are taking several diabetic drugs but none has ...

If you have diabetes, daily management of your blood sugar levels is important to feeling your best and preventing long-term health complications. Blood sugar can also be an important measurement to ...

Testosterone is an important hormone. It helps men develop during puberty, and as they age, it plays a critical role in helping control fat levels, cholesterol, and glucose levels. Testosterone ...