Dr. Susan Carter, MD: Endocrinologist & Longevity Expert

Dr. Susan Carter is an endocrinologist and longevity expert specializing in hormone balance, metabolism, and the aging process. She links low testosterone with thyroid and cortisol patterns and turns lab data into clear next steps. Patients appreciate her straightforward approach, preventive mindset, and calm, data-driven care.

Most-read topics as podcast episodes

We only record episodes on the topics readers care about most.

Start here

New to Dr. Susan Carter, MD's work? Start with these reader-favorite guides.

Best immunity boosting foods for men: What to eat to support your immune system year-round

Best immunity boosting foods for men: What to eat to support your immune system year-round

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Feb 13, 2026 · 13 min read

The best immunity boosting foods are the ones that reliably provide the micronutrients and bioactive compounds your immune cells use to build barriers, signal threats, and resolve inflammation. This guide breaks down the highest-impact foods and shows how men can turn them into a simple, repeatable “immunity plate” for work, travel, and training. Written by: ...

Best weight loss supplements for men: What research actually supports

Best weight loss supplements for men: What research actually supports

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Feb 10, 2026 · 12 min read

The best weight loss supplements for men are the few that show modest, repeatable benefits in human studies, mainly caffeine, green tea extract, and soluble fiber, with mixed evidence for garcinia cambogia and forskolin. The win is not “magic fat loss.” It is small leverage on appetite, energy expenditure, and waist size when you also ...

Function Health testosterone results: What “out of range” really means and what to do next

Function Health testosterone results: What “out of range” really means and what to do next

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Feb 09, 2026 · 13 min read

An “out of range” testosterone result means your value fell outside that lab’s reference interval, not that you have hypogonadism. The next step is to repeat a morning total testosterone and add confirmatory labs (free testosterone with SHBG, plus LH/FSH) interpreted alongside symptoms before deciding on treatment. “When a lab report says ‘normal’, it mostly ...

Keto diet and CGM: What your glucose level can look like and how to avoid reverse metabolic inflexibility

Keto diet and CGM: What your glucose level can look like and how to avoid reverse metabolic inflexibility

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Feb 07, 2026 · 12 min read

On a ketogenic diet, CGM traces usually show a lower, flatter 24-hour glucose curve, while an occasional high-carb meal can cause a higher peak and slower return to baseline because fat adaptation temporarily reduces rapid glucose disposal (“reverse metabolic inflexibility”) rather than proving true insulin resistance. Learn how to interpret trends despite interstitial fluid lag ...

Blueprint supplements for vascular health: What research says

Blueprint supplements for vascular health: What research says

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Jan 30, 2026 · 12 min read

Research does not show that the branded “Blueprint Stack” supplement bundle itself improves vascular health outcomes in men; any likely benefit comes from the Mediterranean-style foods in the routine and the cardiometabolic improvements they support. This men’s health-focused Blueprint protocol review explains what’s in the stack based on public descriptions of Bryan Johnson’s Blueprint protocol, ...

Special OfferLab panels included: $300/year free for all members