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C15:0 Essential Fatty Acid: The Newly Discovered Longevity Nutrient?
For decades, nutrition science focused primarily on omega-3 and omega-6 fatty acids. New research now suggests that C15:0 (pentadecanoic acid), a naturally occurring odd-chain saturated fatty acid, may represent an overlooked essential nutrient. Early evidence indicates C15:0 may support mitochondrial function, reduce inflammation, stabilize cell membranes, improve insulin sensitivity, and potentially influence longevity pathways involved in healthy aging.

David Stephen Klein, MD FACA FACPM
Jun 185 min read


Vitamin D in Midlife May Reduce Future Tau Protein Burden: Implications for Dementia Prevention
A major new study published in Neurology demonstrated that individuals with higher circulating vitamin D levels during midlife showed significantly lower tau protein accumulation in the brain nearly two decades later. Tau protein accumulation is one of the central pathological hallmarks of Alzheimer’s disease and other neurodegenerative disorders. These findings suggest vitamin D optimization during midlife may represent an overlooked but potentially powerful intervention for

David Stephen Klein, MD FACA FACPM
Jun 156 min read


Increasing Metabolism Naturally
Metabolism is influenced by more than genetics. Strategic food choices, adequate protein intake, muscle preservation, sleep quality, and targeted supplements such as berberine, magnesium, alpha-lipoic acid, vitamin D, and L-carnitine can support healthy energy production and weight management. Learn evidence-based strategies to naturally optimize metabolic health.

David Stephen Klein, MD FACA FACPM
Jun 35 min read


Vitamin E and Benefits to Human Health: More Than a Single Vitamin
Vitamin E is far more complex than many people realize. Rather than a single nutrient, vitamin E consists of multiple related compounds including tocopherols and tocotrienols, each with unique biological effects. This article reviews the different forms of vitamin E, their roles in cardiovascular, neurological, immune, and cellular health, and why high-quality supplements should contain a broad spectrum of vitamin E compounds rather than isolated alpha-tocopherol alone.

David Stephen Klein, MD FACA FACPM
May 254 min read


Avoid Vitamin D2, use Vitamin D3
Vitamin D supplements are not interchangeable, and the distinction between vitamin D₂ (ergocalciferol) and vitamin D₃ (cholecalciferol) has real clinical consequences. Although both forms can raise measured vitamin D levels, vitamin D₃ is more potent, more stable, longer lasting, and biologically identical to the hormone the human body naturally produces. In contrast, vitamin D₂ is less effective, clears more rapidly, and may even suppress circulating vitamin D₃, undermining

David S. Klein, MD FACA FACPM
Apr 224 min read


Is It the Cause… or Just a Coincidence? Understanding Why Not Every Imaging Finding Explains Your Symptoms
Not every abnormal finding on an MRI or X-ray explains your symptoms. Many changes in the body are part of normal aging and may be coincidental. Understanding the difference between causal and incidental findings is essential before considering surgery or invasive treatments. A thoughtful, patient-centered approach ensures that care is directed at the true source of symptoms—not just what appears abnormal on imaging.

David Stephen Klein, MD FACA FACPM
Mar 255 min read


What Is an Antioxidant—and Why Are Antioxidants Important?
Antioxidants are essential biological protectors that help maintain cellular integrity by neutralizing harmful molecules known as free radicals. Free radicals are produced naturally during metabolism and play limited roles in immune defense and cell signaling. However, when their production exceeds the body’s protective capacity—a state known as oxidative stress—they can damage cell membranes, proteins, mitochondria, and DNA. Over time, this damage contributes to aging and ma

David S. Klein, MD FACA FACPM
Mar 246 min read


Iodine, Selenium, and Thyroid Function: Why Balance Matters
https://mayoclinic.elsevierpure.com/en/publications/selenium-and-graves-disease/

David Stephen Klein, MD FACA FACPM
Mar 215 min read


Selenium, Thyroid Autoimmunity, and Hypothyroidism. Why This Trace Mineral Matters for Thyroid Health
Selenium plays a crucial role in thyroid hormone metabolism and immune regulation. This trace mineral supports the conversion of T4 to active T3 and protects thyroid tissue from oxidative stress. In autoimmune thyroiditis, selenium may help reduce thyroid antibody levels and stabilize thyroid function. Learn where selenium occurs in food, the role of selenomethionine, and safe supplementation levels for thyroid support.

David Stephen Klein, MD FACA FACPM
Mar 195 min read


Graves’ Disease vs. Hashimoto’s Thyroiditis
Graves’ disease and Hashimoto’s thyroiditis are autoimmune thyroid disorders with opposite effects—one overstimulates the gland, the other progressively destroys it. Though they share immune origins, their symptoms, labs, and long-term risks differ significantly. Accurate diagnosis is essential to prevent cardiovascular, skeletal, and neurocognitive complications and to guide precise, individualized treatment.

David Stephen Klein, MD FACA FACPM
Mar 54 min read
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