Peptide Half-Life Chart: Compare Common Peptides by Duration

Peptide Half-Life Chart: Compare Common Peptides by Duration

This peptide half-life chart compares common research peptides by approximate duration so you can quickly see which compounds are discussed as shorter- or longer-acting. Half-life is a practical reference for understanding exposure, comparison context, and research planning. Use the linked guides, calculators, and protocol pages below for deeper context. Educational and research only, not medical advice.

Peptide Half-Life Chart

Half-life values can vary across studies, formulations, route of administration, and research conditions. Use this chart as a practical reference and verify critical details against primary literature.

Semaglutide

Approximately 7 days (long-acting).

Long-acting GLP-1 analog

Long-duration incretin signaling and weekly research cadence discussions.

Semaglutide guide

Tirzepatide

Approximately 5 days (long-acting).

Long-acting dual incretin analog

GLP-1/GIP comparison work and weekly titration-oriented protocol research.

Tirzepatide guide

Retatrutide

Approximately 6 days (long-acting).

Extended-duration triple agonist analog

Long-acting GLP-1/GIP/glucagon comparison and protocol-planning context.

Retatrutide guide

CJC-1295

With DAC: ~8 days. Without DAC: ~30 minutes.

GHRH analog

Formulation-dependent GH signaling research; DAC and non-DAC versions differ materially.

CJC-1295 guide

Ipamorelin

Approximately 2 hours.

GH secretagogue

Shorter-duration GH pulse discussions and timing-sensitive research frameworks.

Ipamorelin guide

BPC-157

Short; often dosed daily or twice daily in research.

Tissue-repair research peptide

Repair and gut-focused research discussions where exact human PK remains uncertain.

BPC-157 guide

TB-500

Short; dosing frequency varies in research.

Thymosin beta-4-related peptide

Cell-migration and connective-tissue research with non-standardized PK reporting.

TB-500 guide

GHK-Cu

Short; rapid metabolism typical of small peptides.

Copper peptide

Skin, collagen, and topical-versus-injectable research discussions.

GHK-Cu guide

MOTS-c

Not fully established in humans; preclinical data suggests relatively short.

Mitochondria-derived peptide

Metabolic research where human pharmacokinetic detail remains limited.

MOTS-c guide

What Peptide Half-Life Means

Half-life, simply explained

Half-life is how long it takes for about half of a peptide to leave the body.

Simple example

If a peptide starts at 100%, then after one half-life about 50% is left. After two half-lives, about 25% is left. After three half-lives, about 12.5% is left.

100% → 50% → 25% → 12.5%Each step represents one half-life.

Half-life is not the same as completely gone

A 6-day half-life does not mean a peptide is fully gone after 6 days. It means about half may still remain around that point.

Example: Retatrutide

If Retatrutide is discussed with a reported half-life of about 6 days, that means roughly half may still be present after about 6 days. It does not mean the compound is fully cleared. That is one reason it has been studied as a once-weekly compound.

What happens if another dose is given around day 6?

A simple teaching example looks like this:

Day 0: 100%

Day 6: about 50% left

Day 6 or 7: next dose given

Simplified total right after that dose: about 150% of the original single-dose amount

Some of the earlier dose is still present, so the next dose builds on what remains. That is normal with repeated dosing and does not automatically mean anything is wrong or dangerous. It is part of how longer-acting compounds maintain steadier levels over time.

Half-Life and Research Planning

Comparing short- and long-half-life peptides

A short-half-life peptide leaves the body faster, so its levels usually drop more quickly. A long-half-life peptide stays in the body longer, so its levels usually fall more slowly over time.

short half-life = faster drop

long half-life = slower drop

This can affect how a compound is discussed in research planning. Shorter-acting compounds are often associated with tighter timing, while longer-acting compounds are often associated with wider spacing and steadier levels over time.

Why some peptides last longer

Not all peptides stay in the body for the same amount of time. Some are cleared more quickly, while others are designed or modified to last longer.

In simple terms, this can depend on a few things:

the peptide's structure

how stable it is in the body

how quickly the body breaks it down

how it is formulated

Why structure, formulation, and route matter

Half-life is not only about the peptide name itself. It can also be affected by the details of the compound and how it is used in a study.

structure — small changes in the molecule can change how long it lasts

formulation — different versions of a compound may behave differently

route of administration — how a compound is given can affect how quickly it enters and leaves the body

This is one reason half-life values are often approximate rather than exact.

Why this matters in research planning

Understanding half-life helps people compare compounds more clearly.

For example, a shorter-acting peptide may be associated with levels that rise and fall more quickly. A longer-acting peptide may be associated with levels that change more slowly over time.

That helps researchers think about timing, spacing, and how consistent levels may be over a period of days.

Simple takeaway

Half-life helps answer a basic question: How quickly does the amount of this peptide go down over time?

That makes half-life one of the most useful ways to compare peptides in a simple, beginner-friendly way.

Half-Life and Pharmacokinetics

Elimination half-life is one pharmacokinetic metric inside a larger picture. It helps describe concentration decay over time, but it does not capture every variable that shapes exposure.

In practical terms, repeated administrations can create accumulation until a steadier pattern is reached. That is why steady-state discussions matter more for some long-acting analogs than for shorter compounds with faster concentration decline.

Pharmacokinetic context also matters when comparing literature. Study route, assay timing, formulation details, and the population being studied can materially shift the half-life reported in a paper or summary.

Short vs Long Half-Life Peptides

Ultra-short

Often measured in minutes to a few hours. These compounds are usually discussed in timing-sensitive research contexts rather than long-interval schedules.

Short

Short-half-life peptides still clear relatively quickly, so researchers usually interpret them through exposure windows rather than extended carryover.

Medium

Medium-duration compounds sit between pulse-like exposure and long-acting analog behavior. Their interpretation often depends heavily on formulation and route.

Long

Long-half-life peptides are usually easier to compare in weekly or less-frequent planning discussions, but steady-state and accumulation become more relevant.

Extended-duration analogs

Engineered analogs can stay active in circulation much longer than native molecules. Those modifications change both research planning context and comparison logic.

Explore Related Peptide Guides

Use these PeptideUniv pages to go deeper after the reference chart: compound-specific guides, protocol structures, and measurement tools that help place half-life in a broader research workflow.

Pair half-life reference work with mixing, storage, and concentration basics.

Review long-acting triple-agonist background and linked planning tools.

Compare another long-acting incretin analog with established half-life discussion.

Use for short-acting, less-settled pharmacokinetic context and research caveats.

See how a longer half-life influences weekly cadence and titration structure.

Connect duration and steady-state concepts to a weekly protocol framework.

Use after reference review when you need concentration, mL, and U-100 math.

Helpful once you move from comparison intent into measurement and planning.

Use PeptideUniv Tools for Research Organization

PeptideUniv combines calculators, saved protocols, reminders, and organized research workflows so you can move from reference reading into structured planning without losing context.

Start with the calculator for concentration math, then save protocol ideas and keep recurring research tasks organized inside the full workspace.

FAQ

Related Links

Peptide reconstitution guide

Peptide reconstitution calculator

Retatrutide vs Tirzepatide

Tirzepatide protocol guide

For educational and research purposes only. Not medical advice. Consult a licensed healthcare professional for personal guidance.