Knowledge
Peptide Library
Neutral, evidence-scored reference pages. Each entry summarizes what is known, what is not, and the regulatory and safety context. Educational only — not medical advice, dosing, or sourcing.
Not medical advice. Content on peptides.cx is an educational and community resource. It is not medical advice, diagnosis, treatment, prescribing guidance, dosing instruction, or emergency support. Always consult a qualified medical professional before making health-related decisions.
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Evidence scale
- A — Approved / Strong
- Approved medical use or strong clinical evidence.
- B — Human, limited
- Human evidence exists but is limited.
- C — Early / Preclinical
- Mostly early human, animal, or mechanistic data.
- D — Anecdotal
- Anecdotal or insufficient evidence.
A Risk flag marks regulatory or safety concerns. Vendor data is displayed separately and does not affect evidence grades.
BPC-157
Recovery / Regeneration
A synthetic peptide fragment widely discussed for soft-tissue recovery. Human clinical evidence is very limited; most data is animal or mechanistic.
TB-500 / Thymosin Beta-4
Recovery / Regeneration
A peptide related to the naturally occurring protein Thymosin Beta-4, discussed for recovery and regeneration. Human evidence is limited.
GHK-Cu
Skin / Cosmetic
A copper-binding tripeptide common in cosmetics. There is reasonable evidence for topical skin benefits; systemic/injected use is far less studied.
KPV
Inflammation
A short tripeptide fragment of alpha-MSH discussed in the context of inflammation. Human evidence is limited.
Semax
Cognitive
A peptide discussed for cognitive and neuroprotective effects. Approved in some jurisdictions but not others.
Selank
Cognitive / Mood
An anxiolytic-discussed peptide analogue. Approved in some jurisdictions, limited independent evidence elsewhere.
Epitalon
Longevity
A tetrapeptide discussed in longevity circles for telomerase-related claims. Human evidence is weak.
MOTS-c
Metabolic
A mitochondrial-derived peptide discussed for metabolic effects. Mostly preclinical evidence.
DSIP
Sleep
A peptide historically studied for sleep. Human evidence is old and inconsistent.
Ipamorelin
Growth Hormone Secretagogue
A growth-hormone secretagogue discussed for recovery and body composition. Limited human trial evidence.
CJC-1295
Growth Hormone Secretagogue
A growth-hormone-releasing factor analogue, often discussed alongside Ipamorelin. Limited human evidence.
AOD-9604
Metabolic
A growth-hormone fragment once investigated for fat loss. Clinical trials did not lead to approval.
Melanotan I
Pigmentation
A melanocortin agonist related to an approved medicine. Research-market use is unregulated and carries risks.
Melanotan II
Pigmentation
A non-selective melanocortin agonist widely flagged by regulators for safety concerns.
Thymosin Alpha-1
Immune
An immune-modulating peptide approved in some countries for specific conditions.
LL-37
Antimicrobial / Immune
An antimicrobial peptide studied for immune and antimicrobial roles. Mostly preclinical.
Kisspeptin-10
Endocrine
A reproductive-hormone-axis peptide studied in clinical research. Not a consumer product.
GHRP-2
Growth Hormone Secretagogue
A growth-hormone-releasing peptide with limited human evidence and hormonal risks.
GHRP-6
Growth Hormone Secretagogue
A growth-hormone-releasing peptide known for strong appetite effects. Limited human evidence.
Semaglutide
Metabolic
A GLP-1 receptor agonist approved for diabetes and weight management. This page is informational only and not a source or promotion.
Tirzepatide
Metabolic
A dual GIP and GLP-1 receptor agonist approved for diabetes and weight management. Informational only — not a source or promotion.
Retatrutide
Metabolic
An investigational triple agonist (GLP-1, GIP, and glucagon receptors) in clinical trials for obesity and metabolic disease. Informational only — not a source or promotion.
Liraglutide
Metabolic
A daily GLP-1 receptor agonist approved for diabetes and weight management. Informational only — not a source or promotion.
Tesamorelin
Growth Hormone Secretagogue
A GHRH analogue approved as a prescription medicine for a specific condition. Research-market use is unapproved and unsupervised.
Sermorelin
Growth Hormone Secretagogue
A GHRH fragment historically used clinically, now common in research and compounding contexts.
Hexarelin
Growth Hormone Secretagogue
A potent growth-hormone-releasing peptide with limited human evidence and hormonal risks.
MGF / PEG-MGF
Growth Factor
A splice variant of IGF-1 discussed for muscle repair. Human evidence is minimal.
IGF-1 LR3
Growth Factor
A long-acting IGF-1 analogue with significant hormonal/growth-factor risks and little human safety data.
PT-141 (Bremelanotide)
Sexual Health
A melanocortin agonist approved as a prescription medicine. Research-market use is unregulated.
Follistatin
Muscle / Myostatin
A myostatin-pathway protein discussed for muscle growth. Human evidence is essentially absent for research-market use.
SS-31 (Elamipretide)
Mitochondrial
A mitochondria-targeting peptide studied in clinical trials for mitochondrial disease.
Humanin
Mitochondrial
A mitochondrial-derived peptide studied for cytoprotective and metabolic roles. Mostly preclinical.
Gonadorelin
Endocrine
A gonadotropin-releasing hormone used clinically in reproductive endocrinology.
Cerebrolysin
Cognitive / Neuro
A porcine-brain-derived peptide preparation used clinically in some countries for neurological conditions.
N-Acetyl Semax Amidate
Cognitive
A more stable amidated variant of Semax discussed for cognition. Limited independent evidence.
Dihexa
Cognitive
An experimental peptide discussed for potent effects on synaptic connections. Human data is essentially absent.
FOXO4-DRI
Longevity / Senolytic
An experimental senolytic peptide discussed in longevity circles. Human evidence is absent.
Adipotide
Metabolic
An experimental fat-loss peptide with serious safety concerns (renal toxicity in studies). Not for human use.
Thymalin
Immune
A thymus-derived peptide preparation discussed for immune modulation. Independent evidence is limited.
Pinealon
Longevity / Bioregulator
A short 'bioregulator' peptide discussed for neuro/longevity effects. Evidence is weak and largely from one research tradition.
Argireline
Skin / Cosmetic
A popular topical cosmetic peptide marketed for the appearance of expression lines. Topical, not injected.
Matrixyl
Skin / Cosmetic
A well-known topical cosmetic peptide marketed for skin firmness and fine lines.
SNAP-8
Skin / Cosmetic
A topical cosmetic peptide, an extension of the Argireline concept, marketed for expression lines.
VIP
Immune / Neuro
A signalling peptide discussed in niche protocols. Affects vasculature and immune signalling; not a casual compound.
Cagrilintide
Metabolic
A long-acting amylin analogue studied for weight management, mostly in combination with semaglutide. Human trial data are substantial but it is not yet approved anywhere.
ARA-290
Immune
An erythropoietin-derived peptide studied for small-fibre neuropathy in sarcoidosis. Human data come from small phase 2 trials with surrogate endpoints; it is not approved and development has stalled.
Oxytocin
Endocrine
A hormone approved as an injectable obstetric medicine. Its popular 'bonding' and social-cognition uses are intranasal and unapproved, with inconsistent trial evidence.
HCG
Endocrine
A placental hormone approved as a prescription drug for specific fertility and endocrine uses. Its labelled uses are well established; the 'hCG diet' is explicitly unsupported by the drug's own labelling.
HGH
Growth Hormone Secretagogue
Recombinant growth hormone, approved for genuine GH deficiency and specific growth disorders. Anti-ageing and body-composition use in healthy adults is not supported and is legally restricted in the US.
Adamax
Cognitive
A research-market nootropic peptide marketed as a modified analogue of Semax. There is no peer-reviewed pharmacology on Adamax itself, and even its chemical identity is inconsistently described; claims about it are anecdotal.
Cartalax
Recovery / Regeneration
A synthetic Khavinson-type tripeptide (Ala-Glu-Asp) marketed for cartilage and connective-tissue support. Published data are limited to in vitro and mechanistic work from a single research tradition; there are no clinical trials, and the marketed joint/cartilage use is essentially unsupported.
AHK-Cu
Skin / Cosmetic
A copper-binding tripeptide (alanine-histidine-lysine plus copper) marketed for hair growth and skin. Evidence is limited to a small amount of in vitro/ex vivo laboratory work; robust human clinical data are lacking.
5-Amino-1MQ
Metabolic
A small-molecule NNMT inhibitor — not a peptide — investigated for fat metabolism and weight. Evidence is preclinical only, from cell and rodent studies, with no published human trials.
AICAR
Metabolic
An AMPK-activating small molecule (AICA ribonucleoside / acadesine), not a peptide, marketed as an 'exercise mimetic.' It went through large human cardiac-surgery trials that showed no benefit, is not approved anywhere, and is banned in sport by WADA.
Glutathione
Skin / Cosmetic
An antioxidant tripeptide made naturally by the body and widely sold as a supplement for skin lightening, 'detox', and anti-aging. Its endogenous biology is well established, but human evidence for the marketed benefits is weak to mixed.
NAD+
Mitochondrial
A coenzyme — not a peptide — central to cellular energy metabolism, promoted via IV drips and precursor supplements (NR, NMN) for anti-aging and 'wellness'. Precursors reliably raise NAD+ levels, but human evidence for the anti-aging claims is limited.
Melatonin
Sleep
A hormone, not a peptide, produced by the pineal gland to regulate the sleep-wake cycle. It is well studied for sleep-onset and circadian uses, where effects are consistent but modest; it is over-the-counter in the US but prescription-only in several European countries.
GLOW (blend)
Recovery / Regeneration
A research-market blend combining GHK-Cu, BPC-157, and TB-500, marketed for recovery and skin. Blends like this have no evidence base of their own; at best they inherit the thin, mostly preclinical data on each separate component.
KLOW (blend)
Recovery / Regeneration
A research-market blend that stacks several peptides — commonly KPV, GHK-Cu, BPC-157, and TB-500, and in some versions LL-37 — marketed for recovery and inflammation. As with any blend, it has no evidence base of its own and only inherits the thin, mostly preclinical data on its components.