Half-Life Optimization
The Science of Optimization.
Peptides. Metabolic health. Longevity. Performance. Emerging research.
Peptides are everywhere. Good information isn’t. Half-Life Optimization examines the research behind peptides, metabolic health, longevity, recovery and human performance — separating promising science from proven evidence.
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Most-read research
BPC-157: Why Is Everyone Talking About It?
What BPC-157 is, why it became popular in recovery circles, what preclinical research has investigated, and why the human evidence remains limited.
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Retatrutide: Why Researchers Are Studying Three Metabolic Targets
The triple-agonist concept links GLP-1, GIP, and glucagon receptor activity — a research strategy designed to test whether coordinated metabolic signaling can do more than one pathway alone.
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GHK-Cu: The Peptide Your Skin Already Knows
A naturally occurring copper-binding tripeptide with a long biochemistry, a visible cosmetic literature, and important limits on systemic claims.
Read the Research →Latest Research
6 pieces
One Target. Two Targets. Three Targets.
The evolution of incretin-based metabolic research — from GLP-1 receptor agonism to dual and triple receptor strategies.
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Why Add Glucagon?
The third target in retatrutide may be the most interesting — and the easiest to oversimplify.
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Copper Ions, Peptides and the Science of Rejuvenation
Copper-binding peptides such as GHK-Cu are biologically interesting, but 'rejuvenation' is a marketing umbrella — not a single proven outcome.
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Tesamorelin: A Peptide With Real Human Clinical Data
Tesamorelin has human evidence in specific populations and indications — which is exactly why it should not be presented as a general-purpose weight-loss peptide.
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Visceral Fat Isn’t Just ‘Belly Fat’
Where fat is stored changes the biology — and helps explain why researchers measure visceral and subcutaneous adipose tissue separately.
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SS-31: Targeting the Mitochondria
Elamipretide research focuses on mitochondrial membranes and cardiolipin — a compelling mechanism that still should not be translated into broad longevity claims.
Read More →Trending in Metabolic Science
GLP-1, incretins, visceral fat
One Target. Two Targets. Three Targets.
The evolution of incretin-based metabolic research — from GLP-1 receptor agonism to dual and triple receptor strategies.
Read More →Why Add Glucagon?
The third target in retatrutide may be the most interesting — and the easiest to oversimplify.
Read More →Understanding the Evidence
Research literacy
Not All Peptide Evidence Is Equal
Cell studies, animal studies, observational data, controlled human trials, and replication all answer different questions. Promising is not the same as proven.
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‘Backed by Science’ — But What Kind of Science?
Everyone says it’s backed by science. That phrase does not tell you whether the evidence is a petri-dish experiment, a mouse study, or a replicated human trial.
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Peptides Are Everywhere. Good Information Isn’t.
The mission of Half-Life Optimization: separate mechanism, evidence, limitations, regulatory status, and unanswered questions from social-media certainty.
Read More →Longevity & Cellular Health
Mitochondria, skin, aging biology
Copper Ions, Peptides and the Science of Rejuvenation
Copper-binding peptides such as GHK-Cu are biologically interesting, but 'rejuvenation' is a marketing umbrella — not a single proven outcome.
Read More →SS-31: Targeting the Mitochondria
Elamipretide research focuses on mitochondrial membranes and cardiolipin — a compelling mechanism that still should not be translated into broad longevity claims.
Read More →GLP-1 Compounds in Longevity and Performance Circles
The peer-reviewed program for semaglutide and tirzepatide is one of the largest in modern pharmacology. The way it gets discussed in longevity and biohacking media is a different document.
Read More →The Half-Life Brief
Research worth reading. No hype.
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More from the library
Not All Peptide Evidence Is Equal
Cell studies, animal studies, observational data, controlled human trials, and replication all answer different questions. Promising is not the same as proven.
Read More →‘Backed by Science’ — But What Kind of Science?
Everyone says it’s backed by science. That phrase does not tell you whether the evidence is a petri-dish experiment, a mouse study, or a replicated human trial.
Read More →Peptides Are Everywhere. Good Information Isn’t.
The mission of Half-Life Optimization: separate mechanism, evidence, limitations, regulatory status, and unanswered questions from social-media certainty.
Read More →