C15 Deficiency: Why 30% of Americans Are at Risk (and Don’t Know It)

30 May 2025 · 7 min
7:27

A clinician (Aaron Hartman, MD) explains that roughly 30% of Americans have a C15 deficiency, links this deficiency to government dietary recommendations and low intake of healthy saturated fats, and argues C15 is an important essential saturated fatty acid found in full‑fat dairy and ruminant meats. He situates C15 within 'lipid medicine'—the therapeutic use of fats and phospholipids—advocates restoring real-food fat sources (ghee, butter, grass-fed dairy), recommends comprehensive fatty-acid testing rather than focusing only on C15, and highlights related issues (omega‑3/6 balance, oxidative stress, gut health) observed in patients with neurological and chronic illnesses.

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