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Vitamin K: The Overlooked Regulator of Bone, Vascular, and Coagulation Health
Vitamin K plays a critical role beyond clotting—it directs calcium into bone and away from arteries. This article explains the differences between K1, K2, and K3, highlights safe dosing, and outlines key medication interactions, especially with warfarin. Understanding vitamin K helps optimize bone strength, cardiovascular health, and safe anticoagulation management.

David Stephen Klein, MD FACA FACPM
6 days ago5 min read


Vitamin D and Thyroid Function
Vitamin D plays a critical role in thyroid health by regulating immune tolerance, gene expression, and thyroid hormone sensitivity. Low vitamin D levels are strongly associated with autoimmune thyroid diseases such as Hashimoto’s thyroiditis and Graves’ disease, as well as persistent hypothyroid symptoms despite “normal” lab values. Optimizing vitamin D supports immune balance, improves thyroid hormone signaling, and may reduce autoimmune activity.

David Stephen Klein, MD FACA FACPM
Mar 34 min read


Vitamin D is a Hormone
Vitamin D is commonly thought of as a simple nutrient, but medically it functions as a steroid hormone with effects far beyond bone health. Unlike true vitamins, vitamin D is synthesized in the skin, activated through the liver and kidneys, and acts on receptors throughout the body to regulate gene expression. This hormonal role explains its influence on immune function, muscle strength, cardiovascular health, and brain function. Because deficiency is widespread and supplemen

David S. Klein, MD FACA FACPM
Jan 244 min read


The Link Between Estradiol and Bone Health: Preventing Osteoporosis, Osteopenia, and Dementia
By restoring estradiol through evidence-based bioidentical hormone therapy, guided by physicians experienced in integrative care, you can reduce fracture risk, sustain memory, and enhance life quality.

David S. Klein, MD FACA FACPM
Nov 20, 20255 min read


Bioidentical Hormone Replacement Therapy (BHRT): What it is, who benefits, and what the FDA says now
Bioidentical Hormone Therapy in Central Florida | Stages of Life Medical Institute

David S. Klein, MD FACA FACPM
Nov 12, 20254 min read


The Value of Vitamin D3, Strontium, and Vitamin K2 in Osteoporosis Prevention and Treatment
Vitamin D-3, Strontium and Vitamin K-2 are necessary to prevent and treat osteoporosis.

David S. Klein, MD FACA FACPM
Aug 18, 20253 min read


Exploring the Diverse World of Magnesium Chelates and Products: Pros and Cons Unveiled. Choose Intelligently
Magnesium deficiency plagues 30% of the US population. We discuss the relative advantages and subtle differences between different products

David S. Klein, MD FACA FACPM
Mar 22, 202510 min read


Unveiling the Three Pillars of Nutrient Absorption: Rate, Route, and Amount
Understanding the nature of nutrient absorption, simplified.

David S. Klein, MD FACA FACPM
Jan 31, 20255 min read


Nutritional Factors in Treatment of Osteoporosis. Strontium, Calcium, Vitamin K-2 and Vitamin D-3
Know the remarkably few nutraceuticals that you must take to prevent, reduce or reverse osteoporosis and osteopenia.

David S. Klein, MD FACA FACPM
Mar 7, 20248 min read


Reducing Cancer Risk with Vitamin D-3, Cholecalciferol
Why Vitamin D??? Well, for starters, Vitamin D-3 is not a vitamin at all. Vitamin D is a family of steroidal hormones that the body...

David S Klein, MD
Sep 2, 20233 min read
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