Compound library · 17 entries
Peptides are short chains of the same building blocks your body already uses to make proteins — some are approved medicines, most aren't.
What's proven. What's legal. Never one and the same.
How well studied it is, and how you can legally get it — kept separate.
Every compound carries two separate badges: how much it has actually been tested, and whether a UK doctor can prescribe it. One never means the other. Where nobody has finished a proper human dose study, this app says so instead of showing a forum number.
Tier Guide: A = Well studied, B = Some good studies, C = Early evidence & D = Barely studied
MHRA: the UK government body that checks a medicine is safe and actually works before doctors are allowed to prescribe it.
MOTS-c
MetabolicA peptide made inside your own cells' energy factories, studied for exercise and metabolism effects. Only tested in animals — the real thing has never been tested in a human trial.
Mitochondrially-encoded 16-amino-acid peptide that activates AMPK and regulates antioxidant gene expression, studied as an exercise-mimetic for metabolic and muscle-ageing biology.
CHow well studiedEarly evidenceGetting it in the UKPrescribable, but not approved for thisRetatrutide
MetabolicA weight-loss drug still being tested in trials. Works by making you feel full and helping your body burn fat. Not available to buy or be prescribed yet.
Triple GLP-1/GIP/glucagon receptor agonist — the strongest weight-loss data of any drug in development, not yet approved anywhere.
AHow well studiedWell studiedGetting it in the UKSold online only, not prescribableSemaglutide
MetabolicOzempic · Wegovy · Rybelsus
A licensed weight-loss and diabetes drug. Slows digestion and reduces appetite.
GLP-1 receptor agonist — reduces appetite and slows digestion, licensed for weight loss and type 2 diabetes.
AHow well studiedWell studiedGetting it in the UKA doctor can prescribe itTirzepatide
MetabolicMounjaro · Zepbound
A licensed weight-loss and diabetes drug, stronger than semaglutide. Most private GLP-1 users in the UK are on this one.
Dual GLP-1/GIP receptor agonist — the most-prescribed GLP-1 drug in the UK private market.
AHow well studiedWell studiedGetting it in the UKA doctor can prescribe itCJC-1295
Growth HormoneUsed to try to boost the body's own growth hormone, hoping to help with recovery, sleep and body shape. Mostly used in private clinics, not well tested for this.
GH-releasing peptide, almost always paired with Ipamorelin — used for recovery, sleep and body composition.
BHow well studiedSome good studiesGetting it in the UKPrescribable, but not approved for thisIpamorelin
Growth HormoneUsed alongside CJC-1295 to try to boost the body's own growth hormone. Not well tested for this use in people.
Selective GH secretagogue, almost always paired with CJC-1295.
BHow well studiedSome good studiesGetting it in the UKPrescribable, but not approved for thisMK-677
Growth HormoneIbutamoren
A tablet some people take hoping to raise growth hormone and build muscle. Not tested enough to know if it's safe long-term.
Oral GH secretagogue — the only compound in this list that doesn't require injection.
BHow well studiedSome good studiesGetting it in the UKSold online only, not prescribableSermorelin
Growth HormoneAn older version of the drugs used to try to boost growth hormone. Been around longer than the others, but still not well tested for general use.
Older GHRH analog — the gentler, more established alternative to the CJC-1295/Ipamorelin combo.
BHow well studiedSome good studiesGetting it in the UKPrescribable, but not approved for thisTesamorelin
Growth HormoneEgrifta
A drug that boosts your own growth hormone to help lose fat around the stomach. Approved for one specific medical condition, not for general use.
GHRH analog that stimulates your own growth hormone release — approved for visceral fat reduction in a narrow indication.
AHow well studiedWell studiedGetting it in the UKPrescribable, but not approved for thisBPC-157
Tissue RepairA lab-made peptide some people use hoping it helps injuries heal faster. Only tested in animals so far — we don't know if it works the same way in humans.
Tendon and gut repair peptide — the most-discussed recovery compound, but with zero completed human dose-response trials.
CHow well studiedEarly evidenceGetting it in the UKPrescribable, but not approved for thisKPV
Tissue RepairKVP
A lab-made peptide some people use hoping it calms inflammation in the gut and skin. Only tested in animals so far — no human trials yet.
Anti-inflammatory tripeptide derived from alpha-MSH that blocks NF-κB signalling without activating melanocortin receptors.
CHow well studiedEarly evidenceGetting it in the UKPrescribable, but not approved for thisTB-500
Tissue RepairThymosin Beta-4 fragment
Similar idea to BPC-157 — meant to help the whole body heal, not just one injury. Only tested in animals, not people.
Systemic healing peptide, usually paired with BPC-157.
CHow well studiedEarly evidenceGetting it in the UKPrescribable, but not approved for thisPT-141
Sexual HealthBremelanotide · Vyleesi
A drug that can boost sexual desire by acting on the brain, not blood flow. Approved for one specific use in women — not approved for anything else.
Central-acting arousal peptide — approved for one population, widely extrapolated for another.
BHow well studiedSome good studiesGetting it in the UKSold online only, not prescribableGHK-Cu
Skin & CosmeticCopper Tripeptide-1
A copper-based ingredient in skin creams that helps skin make more collagen. Well tested and safe to use — no prescription needed.
The best-evidenced compound in the whole list — a copper-carrying peptide for skin and hair, available topically without any legal complexity.
AHow well studiedWell studiedGetting it in the UKA doctor can prescribe itEpithalon
CognitiveEpitalon
An old idea about slowing ageing by working on cells' "end caps." Only tested in cells and animals — we don't know if it does anything in people.
The weakest evidence base in this list — included because it's genuinely on UK private-clinic menus.
DHow well studiedBarely studiedGetting it in the UKPrescribable, but not approved for thisSemax
CognitiveUsed in Russia for years to help with focus and mood. Barely tested anywhere else — we don't really know how well it works.
Cognitive/nootropic peptide with real clinical history in Russia, minimal Western trial data.
BHow well studiedSome good studiesGetting it in the UKSold online only, not prescribableThymosin Alpha-1
Immune SupportZadaxin · Thymalfasin · Tα1
An immune-system peptide that's a real, approved medicine in over 35 countries for hepatitis B — genuinely well-tested, just not approved here in the UK.
28-amino-acid thymic peptide (thymalfasin) that activates TLR2/TLR9 signalling on dendritic cells to drive T-cell maturation and Th1-polarised immune responses, approved internationally as Zadaxin.
AHow well studiedWell studiedGetting it in the UKPrescribable, but not approved for this