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Hormone Replacement Therapy (HRT) and Osteoporosis: Prevention and Treatment
Hormone decline is a primary cause of osteoporosis. This article explains how hormone replacement therapy (HRT) restores estrogen and testosterone balance to prevent bone loss, improve bone density, and reduce fracture risk. Learn when HRT is appropriate and how it compares to traditional osteoporosis treatments.

David Stephen Klein, MD FACA FACPM
May 83 min read


What is a Vitamin?
What is a vitamin? A physician explains vitamin definitions, deficiencies, supplementation, and why vitamin D is actually a hormone.

David S. Klein, MD FACA FACPM
Jan 134 min read


What is a Mineral, and Why is it Essential?
Minerals are essential inorganic elements that the human body cannot produce but requires for normal structure, metabolism, and physiologic regulation. They play critical roles in bone formation, nerve and muscle function, fluid and electrolyte balance, enzyme activation, hormone production, and oxygen transport. Minerals differ fundamentally from vitamins and hormones, yet deficiencies and imbalances remain common in modern societies due to processed diets, aging, medical co

David S. Klein, MD FACA FACPM
Jan 64 min read
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