Peak healthspan usually requires more than just average numbers.

High levels of the stress hormone cortisol can cause weight gain, skin changes, and muscle weakness. Although short term spikes in cortisol when you're stressed are normal, chron Cortisol, known as ...

Serum parathyroid hormone (PTH) levels exceeding 56 pg/mL (the upper end of the normal reference range) are associated with a 61% higher risk of all-cause mortality (HR, 1.61). Parathyroid hormone ...

Finnish researchers found that hemoglobin levels that are within the normal range but at the lower end may be beneficial for health, particularly for glucose metabolism and cardiovascular health.