Metabolic health

Covers insulin sensitivity, blood sugar control, body composition, and key metabolic markers that influence energy, fat loss, and long-term disease risk. Learn how training, nutrition, sleep, stress management, and hormones like testosterone impact performance and longevity.

Metformin over the counter: Why it requires a script and how to get one safely

Metformin over the counter: Why it requires a script and how to get one safely

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Dec 08, 2025 · 11 min read

Metformin is prescription-only in the U.S., Canada, and the U.K. because it alters mitochondrial energy metabolism and relies on kidney clearance, so reduced renal function can increase the risk of lactic acidosis (dangerously high blood acidity). If you’re pursuing it for weight management or longevity, here’s how clinicians evaluate labs and prescribe it safely through ...

Is Dave’s Killer Bread healthy? What the science says

Is Dave’s Killer Bread healthy? What the science says

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Nov 25, 2025 · 8 min read

Dave’s Killer Bread can be a healthier swap for white bread because its fiber‑protein matrix (about 5 g fiber and 5 g protein per slice in “21 Whole Grains and Seeds”) slows glucose absorption and boosts satiety signals like GLP‑1, but it’s still calorie-dense and contains added sugar. Here’s how to decide whether it supports ...

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