Compare Peptides
Compare peptides head-to-head on benefits, dosing, pricing, and evidence levels.
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Popular Comparisons
BPC-157 vs TB-500
BPC-157 and TB-500 are the two most popular healing peptides, often discussed together. Both promote tissue repair, but through distinct mechanisms. BPC-157 is derived from a protective protein found in gastric juice, while TB-500 is a synthetic fragment of thymosin beta-4, a naturally occurring protein involved in cell migration and wound healing.
CJC-1295 vs Ipamorelin
CJC-1295 and Ipamorelin are both growth hormone secretagogues, but they work through different receptor pathways. CJC-1295 is a GHRH (growth hormone-releasing hormone) analog, while Ipamorelin is a growth hormone-releasing peptide (GHRP). They are frequently combined rather than used as alternatives.
Semaglutide vs Tirzepatide
Semaglutide and Tirzepatide are both FDA-approved for type 2 diabetes and weight management, making them the most evidence-backed peptides available. Semaglutide is a GLP-1 receptor agonist, while Tirzepatide is a dual GIP/GLP-1 receptor agonist -- a key distinction that affects their efficacy profiles.
BPC-157 vs GHK-Cu
BPC-157 and GHK-Cu both promote tissue repair, but they operate through different mechanisms and are suited to different applications. BPC-157 is a gastric-derived peptide focused on deep tissue healing, while GHK-Cu is a naturally occurring copper tripeptide with strong evidence for skin remodeling and gene expression modulation.
MK-677 vs CJC-1295
MK-677 (Ibutamoren) and CJC-1295 both elevate growth hormone levels, but through entirely different mechanisms and routes. MK-677 is technically not a peptide -- it's a non-peptide ghrelin mimetic taken orally. CJC-1295 is a GHRH analog that requires injection. This distinction significantly affects their use profiles.
PT-141 vs Melanotan-2
PT-141 (Bremelanotide) and Melanotan II both act on melanocortin receptors, but PT-141 was specifically developed from Melanotan II to isolate the sexual function effects. PT-141 is the only one of the two that has achieved FDA approval -- specifically for hypoactive sexual desire disorder (HSDD) in premenopausal women.
Epithalon vs GHK-Cu
Epithalon and GHK-Cu are both studied in the context of aging, but they target entirely different aging mechanisms. Epithalon focuses on telomere maintenance at the DNA level, while GHK-Cu modulates gene expression and tissue remodeling. They represent "inside-out" approaches to anti-aging research.
Selank vs Semax
Selank and Semax are both Russian-developed nootropic peptides approved for clinical use in Russia, making them among the few peptides with actual regulatory approval (outside the US). They are often compared because both target cognitive function, but through very different neurotransmitter pathways.
AOD-9604 vs Semaglutide
AOD-9604 and Semaglutide are both studied for fat loss, but they exist on completely different tiers of clinical evidence. Semaglutide is FDA-approved with extensive phase III data, while AOD-9604 is a synthetic fragment of growth hormone that failed to achieve regulatory approval for obesity despite early promise.
TB-500 vs GHK-Cu
TB-500 and GHK-Cu are both tissue repair peptides, but they serve different roles in the healing process. TB-500 focuses on recruiting repair cells and building new blood vessels, while GHK-Cu strengthens tissue quality through collagen remodeling and gene expression changes.
CJC-1295 vs Sermorelin
CJC-1295 and Sermorelin are both GHRH analogs that stimulate growth hormone release through the same receptor pathway. The key difference is that Sermorelin was the first GHRH analog with decades of clinical use, while CJC-1295 is a newer modified version designed for a much longer half-life.
BPC-157 vs Pentadecapeptide
This is a common source of confusion: BPC-157 and pentadecapeptide are the same compound. "Pentadecapeptide" simply means "15 amino acid peptide" (penta = 5, deca = 10), which describes the structure of BPC-157. The term appears in scientific literature as the formal descriptor, while BPC-157 is the commonly used abbreviation.
Ipamorelin vs MK-677
Ipamorelin and MK-677 both stimulate growth hormone release through ghrelin-related pathways, but with important differences in selectivity and side effect profiles. Ipamorelin is a true peptide requiring injection, while MK-677 is a non-peptide small molecule taken orally.
Kisspeptin vs Gonadorelin
Kisspeptin and Gonadorelin both regulate reproductive hormone production, but at different levels of the hypothalamic-pituitary-gonadal (HPG) axis. Kisspeptin acts upstream as the master regulator, while Gonadorelin (GnRH) acts directly on the pituitary. This distinction has important implications for their effects.
Thymosin Alpha-1 vs Thymosin Beta-4
Despite sharing the "thymosin" name, Thymosin Alpha-1 (TA-1) and Thymosin Beta-4 (TB-4/TB-500) serve very different functions. TA-1 is an immune modulator, while TB-4 is a tissue repair peptide. They were both originally isolated from the thymus gland, but their biological roles are distinct.
Dihexa vs Semax
Dihexa and Semax are both studied for cognitive enhancement, but they differ dramatically in evidence level and risk profile. Semax is an approved medication in Russia with decades of clinical data, while Dihexa is a potent research compound with limited safety data beyond animal studies.
MOTS-c vs Humanin
MOTS-c and Humanin are both mitochondrial-derived peptides (MDPs) -- peptides encoded within mitochondrial DNA rather than nuclear DNA. This is a relatively recent discovery in biology, and both peptides are being studied for their roles in metabolic regulation and cellular protection.
LL-37 vs Thymosin Alpha-1
LL-37 and Thymosin Alpha-1 are both immune peptides, but they operate on completely different aspects of immunity. LL-37 is an antimicrobial peptide that directly kills pathogens, while Thymosin Alpha-1 modulates the adaptive immune system by enhancing T-cell function. They represent innate vs. adaptive immunity, respectively.
SNAP-8 vs Argireline
SNAP-8 (Acetyl Octapeptide-3) and Argireline (Acetyl Hexapeptide-3) are both cosmetic peptides that target expression wrinkles. They work through the same mechanism -- inhibiting SNARE complex formation to reduce muscle contraction. SNAP-8 is essentially the next-generation version of Argireline, with two additional amino acids.
FOXO4-DRI vs Epithalon
FOXO4-DRI and Epithalon both target aging, but through opposing strategies. FOXO4-DRI is a senolytic -- it selectively destroys aged "zombie" cells (senescent cells) that accumulate with age. Epithalon aims to keep healthy cells functioning longer by maintaining telomere length. They represent "destroy the old" vs. "preserve the functional."
Semaglutide vs Retatrutide: Dual vs Triple Agonist Weight Loss
Semaglutide and Retatrutide represent two different generations of incretin-based weight loss therapies. Semaglutide is a GLP-1 receptor agonist with extensive clinical data and FDA approval, while Retatrutide is a novel triple agonist targeting GLP-1, GIP, and glucagon receptors simultaneously. The addition of glucagon receptor activation distinguishes Retatrutide from all currently approved therapies and introduces a thermogenic component that may drive greater fat loss -- but it remains in clinical trials.
Tirzepatide vs Retatrutide: Dual vs Triple Agonist
Tirzepatide and Retatrutide are both multi-receptor agonists developed by Eli Lilly, but they target different numbers of receptors. Tirzepatide is a dual GIP/GLP-1 agonist with FDA approval and robust phase III data, while Retatrutide adds a third target -- the glucagon receptor -- creating the first triple agonist in clinical development for obesity. This comparison examines whether the additional glucagon receptor activation translates to meaningfully better outcomes.
Sermorelin vs Tesamorelin: GH Peptide Comparison
Sermorelin and Tesamorelin are both GHRH (growth hormone-releasing hormone) analogs that stimulate the pituitary gland to produce growth hormone. Despite sharing the same fundamental mechanism, they differ significantly in regulatory status, clinical evidence, half-life, and cost. Sermorelin is a well-known compounded peptide with decades of use, while Tesamorelin is the only GHRH analog currently holding active FDA approval -- specifically for HIV-associated lipodystrophy.
BPC-157 vs KPV: Best Peptide for Gut Healing
BPC-157 and KPV are two of the most discussed peptides for gastrointestinal health, but they approach gut healing through fundamentally different mechanisms. BPC-157 (Body Protection Compound-157) is a gastric pentadecapeptide that promotes tissue repair through multiple growth factor pathways. KPV is a tripeptide fragment of alpha-MSH (alpha-melanocyte-stimulating hormone) that acts primarily as a potent anti-inflammatory agent. Understanding their distinct mechanisms helps clarify when each may be most relevant.
GHRP-2 vs GHRP-6 vs Hexarelin: Growth Hormone Peptide Comparison
GHRP-2, GHRP-6, and Hexarelin are all growth hormone-releasing peptides (GHRPs) that stimulate GH secretion by activating ghrelin receptors (GHS-R1a) on the pituitary gland. While they share the same receptor target, they differ meaningfully in potency, side effect profiles, and practical usability. All three also elevate cortisol and prolactin to varying degrees -- a key distinction from Ipamorelin, which is the only GHRP that selectively releases GH without significant impact on these hormones. This three-way comparison helps clarify when each GHRP might be preferred and why many researchers ultimately choose Ipamorelin instead.
Semax vs Cerebrolysin: Nootropic Peptide Comparison
Semax and Cerebrolysin are both neuropeptides with decades of clinical use in Russia and Europe, yet they differ fundamentally in origin, administration, and mechanism. Semax is a synthetic heptapeptide analog of ACTH(4-10) originally developed at the Institute of Molecular Genetics in Moscow. Cerebrolysin is a porcine brain-derived peptide preparation containing a complex mixture of neurotrophic factors and free amino acids, manufactured by EVER Neuro Pharma in Austria. Both target brain-derived neurotrophic factor (BDNF) pathways and have been studied for cognitive enhancement, neuroprotection, and neurological recovery -- but they occupy very different niches in terms of convenience, evidence base, and intended use cases.
NAD+ vs MOTS-c vs SS-31: Mitochondrial Peptide Comparison
NAD+, MOTS-c, and SS-31 (Elamipretide) all target mitochondrial function, but through fundamentally different mechanisms. NAD+ (nicotinamide adenine dinucleotide) is a coenzyme -- not technically a peptide -- that fuels critical mitochondrial enzymes and sirtuins. MOTS-c is a mitochondrial-derived peptide encoded within the mitochondrial genome that activates AMPK and mimics the metabolic benefits of exercise. SS-31 is a synthetic tetrapeptide that binds cardiolipin in the inner mitochondrial membrane, stabilizing cristae structure and reducing reactive oxygen species (ROS). Together, these three compounds are sometimes referred to as the "mitochondrial trifecta" in longevity research communities, each addressing a different layer of mitochondrial health.
Semaglutide vs Tesofensine: Weight Loss Comparison
Semaglutide and Tesofensine represent two fundamentally different pharmacological approaches to weight loss. Semaglutide is a GLP-1 receptor agonist that reduces appetite through gut-brain hormonal signaling -- it is FDA-approved and backed by extensive Phase III clinical data. Tesofensine is a triple monoamine reuptake inhibitor (serotonin, norepinephrine, and dopamine) that suppresses appetite through central nervous system stimulation. Tesofensine reached Phase II trials with impressive weight loss results but has not advanced to Phase III approval due to cardiovascular safety concerns. This comparison examines the evidence, safety profiles, and practical considerations for each.