What Are Peptides?

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input: PEPTIDE DEFINITIONS (use for mechanism accuracy; no medical claims):
BPC-157 — Body Protection Compound. Derived from gastric juice protein. Builds new blood vessels into damaged tissue locally. 100+ animal/cell studies (tendon, gut, muscle, bone, nerve).
TB-500 — Synthetic Thymosin Beta-4. Moves repair cells to damage; clears stuck inflammation systemically. Production drops ~60% by age 60.
ARA-290 — Nerve repair peptide with human clinical trial data. Regrows damaged nerves; does not mask nerve pain.
Semax — Brain peptide; upregulates BDNF for neuroprotection and cognitive recovery.
Selank — Anxiolytic peptide; reduces anxiety without sedation or addiction (non-benzodiazepine pathway).
PT-141 — Sexual function; brain-level arousal signaling (FDA-approved mechanism as Vyleesi).
DSIP — Del

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  "slug": "what-are-peptides",
  "title": "What Are Peptides?",
  "body": "# What Are Peptides?\n\n## Core Definition\nPeptides are short chains of amino acids connected by peptide bonds. They function as signaling molecules that cells use to communicate and coordinate responses.\n\n## How Peptides Differ from Other Categories\nPeptides are distinct from small-molecule drugs, which typically bind targets directly to block or activate pathways. They also differ from anabolic steroids, which are synthetic hormones that alter gene expression systemically. Unlike dietary supplements such as vitamins or minerals, peptides are sequences that cells naturally produce or recognize.\n\n## Structure and Function\nPeptide length ranges from two to roughly fifty amino acids. Shorter chains often act locally; longer ones can circulate. Their sequence determines which receptors or processes they influence.\n\n## Evidence Tiers and Reading Study Data\nPreclinical data come from cell or animal models. Human data come from controlled clinical trials. Anecdotal reports are individual user observations. Mechanistic studies describe how a molecule interacts with cells or tissues in isolated systems. Speculative claims lack supporting data of any kind.\n\n## Examples of Peptide Categories\nBPC-157 is a fragment derived from a gastric juice protein; more than 100 animal and cell studies have examin

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I am adding explicit gaps in the knowledge and naming who claims what from anecdotes where missing, as per the instructions.

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## What this article is

This primer defines peptides as a class and explains how they differ from proteins, small-molecule drugs, and dietary supplements. It outlines the evidence tiers available for peptide claims and shows readers how to evaluate those claims without relying on any single compound.

## What is a peptide (amino acid chains)?

A peptide is a short string of amino acids linked by peptide bonds. Reviews consistently place the boundary at roughly 2–50 amino acids, after which the molecule is classified as a protein.

## How do peptides differ from proteins, small-molecule drugs, and supplements?

- **Proteins**: Peptides are smaller oligomers; proteins exceed the size threshold (commonly >50 amino acids) and usually fold into complex three-dimensional structures.
- **Small-molecule drugs**: Many therapeutic peptides are regulated as small-molecule drugs when they contain ≤40 amino acids, yet their size and polarity often place them in a distinct pharmacokinetic category between classic small molecules and biologics.
- **Supplements**: Most dietary supplements deliver amino acids or protein hydrolysates for nutrition; therapeutic peptides are developed and studied for specific signaling or regulatory functions rather than general nutrition.

## What are evidence tiers (human, preclinical, anecdote)?

- **Human evidence**: Randomized controlled trials and approved 

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## What this article is

This primer defines peptides as a molecular class and explains how they differ from proteins, small-molecule drugs, and dietary supplements. It presents the evidence tiers available for peptide claims and outlines a practical way to evaluate statements about their effects.

## What is a peptide

A peptide is a short chain of amino acids joined by peptide bonds. Standard biochemical definitions place the upper limit at roughly 50 amino acids; chains longer than this threshold are classified as proteins. The sequence of amino acids determines the peptide’s shape and the specific signals it can transmit within cells or tissues.

## Core definitions

- **Amino acid chain length** distinguishes peptides from proteins; length also influences how readily a peptide can be synthesized, absorbed, or cleared.
- **Signaling role** refers to the ability of certain peptides to bind receptors or modulate enzymatic pathways, functioning as localized chemical messengers.
- **RUO versus Rx distinction** separates research-use-only materials from approved pharmaceutical products; regulatory status determines whether human safety and efficacy data are required.

## Evidence tiers

Human data consist of randomized controlled trials and approved therapeutics. Preclinical data include cell-culture and animal studies that identify biological activity but do not establish clini

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## What this article is

This primer defines peptides as a class of molecules, explains how they differ from proteins and other common substances, and outlines the evidence standards readers should apply when evaluating claims. It focuses on structure, classification, and regulatory context rather than any single compound.

## What is a peptide

A peptide is a short chain of amino acids joined by peptide bonds. Standard biochemical definitions place peptides between two and roughly fifty amino acids long; chains exceeding that length are classified as proteins. The exact boundary varies by source, but size remains the primary distinction.

Peptides function as signaling molecules. They can act as hormones, enzyme substrates, or messengers that bind specific receptors and trigger cellular responses. Sequence length influences stability, receptor specificity, and how the molecule is processed by the body.

## How peptides differ from proteins, drugs, and supplements

Proteins are longer amino-acid polymers that typically fold into complex three-dimensional structures and perform structural or enzymatic roles. Peptides are shorter and often act through direct receptor interaction rather than structural scaffolding.

Small-molecule drugs are chemically synthesized compounds, usually under 900 daltons, that can cross cell membranes more readily. Peptides occupy a middle ground: larg

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Hash-chained sources verify integrity, not clinical truth. Evidence mix is predominantly preclinical and anecdotal; human data are sparse. No dosing, protocol, or treatment recommendations — catalogue only.

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input: what-are-peptides c140

Hash-chained sources verify integrity, not clinical truth. Evidence mix is predominantly preclinical and anecdotal; human data are sparse. No dosing, protocol, or treatment recommendations — catalogue only.