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Nathan Ellsberg

Nathan Ellsberg

MPH, Epidemiology
Columbia University Mailman School of Public Health · 7 years experience
Research Methodology Evidence Synthesis Epidemiology Study Design

Nathan holds a master of public health in epidemiology from Columbia's Mailman School. He brings an epidemiologist's eye to supplement and longevity claims, distinguishing association from causation and evaluating study design quality.

20
Articles
108
Total reading minutes
Articles by Nathan Ellsberg
Your Gut Bacteria Decide Your Mood Before Your Brain Does — and the Science Is Stranger Than You Think
Gut

Your Gut Bacteria Decide Your Mood Before Your Brain Does — and the Science Is Stranger Than You Think

The gut-brain axis is real, measurable, and profoundly underused in mental health treatment....

4 min · Jun 19, 2026

Your Morning Cortisol Spike Is Not the Problem -- Here Is What Actually Breaks the Rhythm
Hormones

Your Morning Cortisol Spike Is Not the Problem -- Here Is What Actually Breaks the Rhythm

Cortisol isn't the enemy. Your circadian rhythm is. Fix these 4 daily habits that break your...

5 min · Jun 16, 2026

Zone 2 Training: Why Going Slower Gets You Fitter, Faster
Fitness

Zone 2 Training: Why Going Slower Gets You Fitter, Faster

Most people spend zero time in Zone 2 -- the metabolic sweet spot that builds mitochondrial...

6 min · Jun 15, 2026

You're Probably Not Overtrained -- You're Underrecovered: What Sports Science Shows
Fitness

You're Probably Not Overtrained -- You're Underrecovered: What Sports Science Shows

The clinical diagnosis of overtraining syndrome is rare. Most athletes hitting a wall are...

4 min · Jun 13, 2026

Shame Shuts Down the Prefrontal Cortex — That's Why It's So Hard to Think Your Way Out
Mental Health

Shame Shuts Down the Prefrontal Cortex — That's Why It's So Hard to Think Your Way Out

Shame isn't just an emotion — it's a survival response that hijacks your brain, dysregulates...

11 min · Jun 10, 2026

Loneliness Hurts Like Physical Pain — Because to Your Brain, It Is
Mental Health

Loneliness Hurts Like Physical Pain — Because to Your Brain, It Is

Loneliness isn't about how many people you're around — it's a neurobiological signal with...

9 min · Jun 07, 2026

DHEA: The Hormone That Peaks at 25 and Declines for Decades — What the Evidence Shows
Hormones

DHEA: The Hormone That Peaks at 25 and Declines for Decades — What the Evidence Shows

DHEA is one of the most studied anti-aging compounds in existence — with over 4,000 published...

11 min · Jun 04, 2026

Glutathione: The Master Antioxidant — And Why Most Supplements Don't Work
Nutrition

Glutathione: The Master Antioxidant — And Why Most Supplements Don't Work

Glutathione is the body's most important antioxidant — but most oral supplements barely absorb....

9 min · Jun 04, 2026

BPC-157: What 100+ Animal Studies Show (and Why Human Trials Still Don't Exist)
Supplements

BPC-157: What 100+ Animal Studies Show (and Why Human Trials Still Don't Exist)

BPC-157 has 100+ peer-reviewed preclinical studies and zero completed human RCTs. Here's a...

10 min · Jun 03, 2026

Phosphatidylserine: The Brain Phospholipid With an FDA-Recognized Health Claim
Brain

Phosphatidylserine: The Brain Phospholipid With an FDA-Recognized Health Claim

Phosphatidylserine is one of the only supplements with an FDA-recognized qualified health claim...

9 min · Jun 03, 2026

The Testosterone Optimization Stack: Tongkat Ali, Ashwagandha, Zinc, and Boron
Hormones

The Testosterone Optimization Stack: Tongkat Ali, Ashwagandha, Zinc, and Boron

Most testosterone articles review one compound at a time. Here's how Tongkat Ali, Ashwagandha,...

11 min · Jun 03, 2026

Urolithin A: The Mitochondrial Cleanup Compound Your Gut Bacteria Make (Or Don't)
Gut

Urolithin A: The Mitochondrial Cleanup Compound Your Gut Bacteria Make (Or Don't)

Urolithin A triggers mitophagy—clearing damaged mitochondria. But only 40% of people naturally...

3 min · Jun 03, 2026

Vitamin D: Who Actually Needs to Supplement
Nutrition

Vitamin D: Who Actually Needs to Supplement

Vitamin D is one of the most-supplemented nutrients, but the evidence says it mainly helps...

1 min · May 25, 2026

Superfoods, Decoded: What the Evidence Actually Supports
Nutrition

Superfoods, Decoded: What the Evidence Actually Supports

"Superfood" is a marketing word, not a scientific one, but some of the foods it describes have...

1 min · May 25, 2026

Kava for Anxiety: What the Evidence Shows (and the Liver Question)
Mental Health

Kava for Anxiety: What the Evidence Shows (and the Liver Question)

Kava has some of the strongest herbal evidence for anxiety, alongside a real but nuanced...

1 min · May 25, 2026

Cold Plunges and Cold Showers: Hype vs. Evidence
Supplements

Cold Plunges and Cold Showers: Hype vs. Evidence

Cold water immersion is everywhere in biohacking. The evidence supports some benefits (recovery,...

1 min · May 25, 2026

Beta-Alanine and the Science of the Burn
Fitness

Beta-Alanine and the Science of the Burn

The tingly amino acid behind countless pre-workout powders has a real, if narrow, performance...

3 min · May 23, 2026

Rapamycin and the Longevity Frontier
Longevity

Rapamycin and the Longevity Frontier

Rapamycin is the most reproducible lifespan-extending drug in animal research — and the most...

3 min · May 17, 2026

Collagen Peptides: Skin, Joints, and the Evidence
Supplements

Collagen Peptides: Skin, Joints, and the Evidence

Collagen gets digested into ordinary amino acids, so how could it target your skin and joints?...

3 min · May 11, 2026

Modafinil: An Honest Look at the Smart Drug
Brain

Modafinil: An Honest Look at the Smart Drug

Modafinil is the prescription wakefulness agent that earned the "smart drug" label — the...

3 min · May 05, 2026