What are the seven core types of peptides, and how do they differ in function?

Peptides are categorized into seven main types based on their primary function: Growth Hormone Secretagogues (muscle, recovery), Tissue Repair (healing), Metabolic/GLP-1 (weight, blood sugar), Cognitive (brain function), Immune Modulators (immune health), Longevity (anti-aging), and Cosmetic (skin health). Each type targets specific physiological pathways, from stimulating growth hormone release to enhancing tissue regeneration or regulating metabolism.

Which types of peptides are FDA-approved, and what does 'research-only' status imply for others?

While metabolic peptides like Semaglutide and Tirzepatide are FDA-approved for conditions like diabetes and obesity, many other types, including most Growth Hormone Secretagogues (e.g., Ipamorelin, CJC-1295) and Tissue Repair Peptides (e.g., BPC-157), are designated 'research-only.' This status means they are not approved for human therapeutic use and their sale is restricted to research purposes, with significant regulatory tightening observed since 2023-2024.

If I'm looking for tissue repair and injury healing, which type of peptide should I consider?

For accelerating healing and regeneration of damaged tissues, the Tissue Repair Peptides category is most relevant. Examples include BPC-157 and TB-500, which work by enhancing blood vessel formation, modulating inflammation, and upregulating growth factors. However, it's crucial to note that TB-500 was prohibited by the FDA in 2023, and BPC-157 remains research-only for human therapeutic use.

How do Metabolic & GLP-1 Peptides aid in weight management and blood sugar control?

Metabolic & GLP-1 Peptides, such as Semaglutide and Tirzepatide, regulate metabolism primarily by mimicking GLP-1 (and GIP) hormones. This action slows gastric emptying, increases satiety, and enhances insulin secretion, leading to improved blood sugar control and significant weight loss. These peptides are among the few that have received FDA approval for these therapeutic applications.

How can I determine which type of peptide is right for my specific health or performance goals?

Determining the right peptide type depends entirely on your specific goals, whether it's muscle growth, injury recovery, weight management, or cognitive enhancement. PeptideKey.com categorizes peptides into seven core types, each with distinct mechanisms and benefits. It's essential to understand the primary benefits, mechanisms, and current FDA status of each category to align with your objectives, always consulting a healthcare professional for personalized guidance.

PeptideKey Research Library

Peptide Basics: FDA-Approved vs. Research-Only [2026]

Explore the fundamental types of peptides, their research applications, and potential benefits. Understand safety considerations and evidence-based insights.

This research guide is part of PeptideKey's evidence-based peptide research library covering 100+ compounds with lab-verified purity data.