Best Peptides for Fat Loss & Body Recomposition

AOD-9604 is a synthetic fragment of human growth hormone, copying just the last 15 amino acids of the hormone (residues 176 to 191) plus a tyrosine cap. The idea was to keep the fat-burning end of growth hormone while leaving out the part that raises IGF-1 or messes with blood sugar. It was developed by Metabolic Pharmaceuticals in Australia and tested as an anti-obesity drug, but it is not approved by the FDA or any major regulator, and development stopped after it missed its weight-loss targets.

SLU-PP-332 is a small synthetic molecule, not a peptide, that turns on the estrogen-related receptors (ERRalpha, beta and gamma), the master switches behind much of the body's response to endurance exercise. Researchers call it an 'exercise mimetic' because in mice it boosts mitochondria, shifts muscle toward fatigue-resistant fibers, improves stamina and trims fat without the animal moving more. It was made as a lab tool to study exercise biology. There are no human trials.

HGH Fragment 176-191 is exactly what it sounds like: a short tail-end piece of the human growth hormone molecule, amino acids 176 through 191. The idea was to keep the fat-burning part of growth hormone while ditching the parts that raise blood sugar and IGF-1. The optimized drug version, AOD-9604, actually went through real human trials for obesity, and the blunt result is that it was very safe but did not produce meaningful weight loss.

First, a correction worth making loudly: 5-amino-1MQ is not a peptide. It is a small molecule (5-amino-1-methylquinolinium), and it gets lumped in with research peptides mostly because of the crowd that sells it. It blocks an enzyme called NNMT, and in obese mice it produced weight and fat loss without the animals eating less. No human trials have been published.

Retatrutide is the heavy hitter of the new weight-loss drugs: a once-weekly injectable peptide that hits three receptors at once - GIP, GLP-1, and glucagon - earning it the nickname triple-G agonist. In a phase 2 trial it produced some of the largest weight loss ever recorded for a drug, up to roughly 24 percent of body weight at the top dose. It is investigational, made by Eli Lilly, and not yet FDA approved as of 2026.

Survodutide is an injectable dual agonist that hits both the GLP-1 and glucagon receptors, developed by Boehringer Ingelheim and Zealand Pharma. It is being tested for obesity and for fatty liver disease (MASH), and it carries an FDA Breakthrough Therapy designation for MASH. It is still investigational and not approved for any use as of mid-2026.

CJC-1295 is a synthetic analog of growth hormone-releasing hormone (GHRH), specifically a modified GHRH(1-29), engineered for a long duration of action. The form most people mean by CJC-1295 includes a Drug Affinity Complex (DAC) that binds blood albumin to extend its half-life to roughly 6 to 8 days, raising GH and IGF-I for days from a single injection. It was developed by ConjuChem, reached Phase II trials and was abandoned; it is not an approved drug and is sold only as a research chemical. A version without DAC (Modified GRF 1-29) acts for only about 30 minutes.

MOTS-c is a 16-amino-acid peptide your own mitochondria make, encoded inside the 12S rRNA region of mitochondrial DNA and discovered in 2015. It is studied as a metabolic regulator and a so-called exercise mimetic, because its levels rise when you work out and it improves insulin sensitivity in animals. The catch: the impressive results are almost entirely in mice, with no completed published human efficacy trials.

Humanin is a 24-amino-acid peptide encoded inside mitochondrial DNA (in the 16S rRNA gene), discovered in 2001 and named for its ability to protect human neurons from Alzheimer-related cell death. It was the first member of the mitochondrial-derived peptide family and is studied mainly for neuroprotection, cell survival, and metabolic and age-related disease. The honest status: it has the deepest preclinical evidence base of any mitochondrial peptide, but human therapeutic trials are essentially absent.

NAD+ precursors are not peptides. They are small molecules, mainly nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN), that the body converts into NAD+, a coenzyme every cell needs to make energy and run repair enzymes. NAD+ falls with age, so these precursors are sold as anti-aging and metabolic supplements. Human trials confirm they reliably raise blood NAD+ levels, but clear proof of real health benefits in people is still missing.

Pancragen is a synthetic tetrapeptide bioregulator, Lys-Glu-Asp-Trp (KEDW), from the Khavinson group, designed to target pancreatic tissue. It is studied for supporting blood-sugar control and the insulin-producing endocrine pancreas, especially in aging. It is a research compound with no approval and no published human clinical trials. The notable evidence comes from aged primates, not people.