Which Peptide Is Right for You? A Goal-by-Goal Comparison Guide

By Judith Wenshuk, peptide research writer

Quick Answer: The right research peptide depends entirely on the research goal — fat loss, muscle and recovery, skin and anti-aging, or sleep and cellular health point to different compound categories entirely. This guide breaks down which peptides fall into which category so you’re not starting from a catalog of 24 unfamiliar names with no sense of where to look.

Walking into a research peptide catalog for the first time is overwhelming — dozens of names, most of them unfamiliar, with no obvious starting point. The easier way in is to start from the goal, not the compound. Here’s how the main categories break down.

For Metabolic and Fat Loss Research

This is the category most people have already heard of, thanks to the GLP-1 family:

• Semaglutide — the most established of the three, with the longest track record of published data
• Tirzepatide — a dual-receptor compound (GLP-1 and GIP), generally associated with stronger results than semaglutide alone in trial data
• Retatrutide — the newest of the three, targeting three receptors (GLP-1, GIP, and glucagon), with the strongest early trial results of the group but the least long-term data

If you’re deciding between these three specifically, we’ve written a full head-to-head comparison.

For Muscle Growth and Recovery-Adjacent Research

A broader category covering growth hormone signaling and tissue-repair compounds:

• CJC-1295 and Ipamorelin — usually studied together as a growth-hormone-secretagogue pairing
• Tesamorelin — another growth-hormone-releasing compound, with a more established research history than most in this category
• IGF-1 LR3 — studied for its role downstream of growth hormone activity
• SLU-PP-332 — a newer, much less-studied compound sometimes discussed in the context of exercise-mimetic research
• HGH (191aa) — human growth hormone itself, the compound the rest of this category relates to

For Recovery and Tissue Research

• BPC-157 — the most-referenced compound in recovery research, particularly around tendon and soft-tissue healing
• TB-500 — frequently studied alongside BPC-157 for similar tissue-repair applications
• KPV — studied specifically in inflammation and gut-health research contexts
• Wolverine Blend — a pre-combined blend built around this recovery-research category

For Skin, Anti-Aging, and Cellular Health Research

• GHK-Cu — a copper peptide widely studied in cosmetic and skin-research applications
• NAD+ — studied for its role in cellular energy production and aging research
• Glutathione — one of the body’s primary antioxidants, studied for oxidative stress research
• SS-31 — a mitochondrial-targeted peptide, one of the newer and less-studied compounds in this category
• Melanotan-1 and Melanotan-2 — both studied in pigmentation and appetite-related research, with some differences between them worth understanding if you’re deciding between the two

Blends: When You Want Multiple Compounds Together

If your research interest spans more than one category, blends like GLOW and KLOW combine several compounds — typically BPC-157, GHK-Cu, and TB-500, with KLOW adding KPV — into a single standardized vial rather than requiring you to source and reconstitute each one separately.

Starting Point If You’re Still Not Sure

If none of the above narrows it down, the single most-referenced compound in each category is usually the reasonable starting point: Retatrutide for metabolic research, BPC-157 for recovery research, GHK-Cu for skin research, and CJC-1295/Ipamorelin for growth-hormone research. Each has the deepest body of research behind it in its category, which makes it the easiest to research further once you’ve picked a direction.