Peptide classes
The family is grouped by which receptors a molecule activates, not by brand or indication. That is the only grouping that predicts how a peptide behaves.
New to peptide classes? Read the full guide: Peptide classes overview — receptors and evidence
GLP-1
5 ENTRIESSingle-receptor incretin agonists — the approved backbone of the class.
Deep dive: GLP-1 medicines and muscle — lean-mass data, protein, training and investigational add-ons
GLP-2
2 ENTRIESIntestinotrophic analogues acting on the GLP-2 receptor.
GLP-3
4 ENTRIESThe consumer nickname for triple agonists led by retatrutide.
Deep dive: Retatrutide explained — mechanism, trials and status
Dual agonist
1 ENTRIESGIP + GLP-1 co-agonists combining two incretin pathways.
Deep dive: GLP-1 medicines and muscle — lean-mass data, protein, training and investigational add-ons
Amylin
1 ENTRIESAmylin analogues used alone or paired with an incretin.
Native hormones
4 ENTRIESThe endogenous peptides the whole class is modelled on.
GH secretagogues
6 ENTRIESGHRH analogues and ghrelin-receptor agonists that raise endogenous growth hormone.
Deep dive: Growth hormone peptides compared — tesamorelin, sermorelin, ipamorelin, CJC-1295
Repair & recovery
3 ENTRIESPeptides studied for tissue healing, angiogenesis and connective-tissue repair.
Deep dive: BPC-157 evidence check — claims vs animal vs human data
Immune & inflammation
2 ENTRIESThymic and anti-inflammatory peptides that modulate immune signalling.
Melanocortin
2 ENTRIESMelanocortin-receptor agonists affecting pigmentation, arousal and appetite.
Longevity & metabolic
3 ENTRIESMitochondrial and pineal peptides studied in ageing and metabolic research.
Neuro & cognitive
2 ENTRIESRegulatory peptides studied for anxiety, stress resilience and cognition.