PeptideGeekBestatin (Ubenimex)
A peptide drug approved in Japan as an add-on cancer therapy — it boosts immune-cell activity while blocking enzymes some cancer cells rely on.
Some human studies
Every guide, grouped by goal
Every peptide guide, by goal
139 peptides, each explained in plain English: how much to take, where to inject, how to mix the vial, what side effects to expect, and how strong the science really is.
24 guides
Immune system
Studied for supporting your body's defenses
Cathelicidin (hCAP-18 / Synthetic Derivatives)
Your body's built-in antibiotic protein and its lab-made upgrades — studied for killing drug-resistant bacteria, including MRSA, that standard antibiotics can't touch.
Some human studies
Chonluten
A three-amino-acid peptide from Russian research, studied for calming airway inflammation and supporting aging lungs. Human evidence is still thin.
Very few human studies
Crystagen
A three-amino-acid peptide from Russian research, studied for reviving the thymus — the gland that trains your immune cells. Human evidence is still thin.
Very few human studies
Daptomycin
An FDA-approved last-line antibiotic (Cubicin) that kills drug-resistant bacteria — including MRSA — by punching holes in their membranes.
Well studied in people
Defensin (HBD-2)
A natural antibiotic peptide your own skin and airways make on demand when germs attack — it kills bacteria and calls in immune reinforcements.
Some human studies
Defensin (HBD-3)
The most potent of your body's own antibiotic peptides — it kills MRSA in lab tests and keeps working under conditions that disable similar peptides.
Some human studies
Gramicidin
The first antibiotic ever mass-produced, discovered in 1939 — still used today in combination antibiotic eye drops and skin preparations.
Well studied in people
Immunoxel (Dzherelo)
Ukrainian botanical immunomodulator that supercharges tuberculosis treatment and restores immune function in HIV patients.
Some human studies
Imunofan
A lab-made fragment of a thymus-gland hormone, used in Eastern Europe to support immune function during infections and chemotherapy.
Very few human studies
Lactoferricin B
A germ-fighting peptide released when a milk protein is digested — studied against bacteria, biofilms, and possibly tumors.
Some human studies
Lentinan
A shiitake-mushroom extract approved in Japan as an add-on cancer therapy for its immune-activating effects.
Some human studies
LL-37
Your body's frontline antibiotic peptide — it kills bacteria, disarms their toxins, and has reached mid-stage human trials for stubborn wound healing.
Some human studies
Magainin-2
A germ-killing peptide discovered in frog skin — the find that launched the whole field of antimicrobial peptides; a derivative reached late-stage trials for diabetic foot ulcers.
Some human studies
Nisin
A food-safe antibiotic peptide used as a preservative for over 50 years — it kills tough bacteria like MRSA and Listeria by two mechanisms at once.
Well studied in people
Pidotimod
An oral immune-support medicine used in Europe and Asia to cut down recurring respiratory infections, especially in children.
Some human studies
PNC-27
A cancer-fighting peptide that works like a smart missile—it hunts down and destroys cancer cells by poking holes in them, while leaving your healthy cells completely untouched.
Animal studies only — extensive
Polymyxin B
A last-resort antibiotic, FDA-approved since the 1960s, reserved for the hardest-to-kill drug-resistant infections.
Well studied in people
Thymalin
Russian thymic peptide complex that rejuvenates immune function and supports healthy aging.
Very few human studies
Thymopentin (TP-5)
The active five-amino-acid core of a thymus-gland hormone, studied for sharpening weakened immune responses.
Some human studies
Thymopoietin
Thymic hormone that supports T-cell development and immune function, with the active fragment thymopentin (TP-5) used in clinical research.
Very few human studies
Thymosin Alpha-1
Your immune system's master trainer—a naturally occurring thymus peptide that wakes up tired immune cells, helps your body fight infections, and keeps your defenses sharp as you age.
Some human studies
Thymulin (FTS)
A zinc-dependent hormone from the thymus gland that helps immune cells mature — studied for restoring weakened immunity.
Very few human studies
Vilon
A two-amino-acid peptide from Russian longevity research, studied for restoring immune balance and calming chronic inflammation. Human evidence is still thin.
Very few human studies
23 guides
Healing & recovery
Studied for repairing tissue and bouncing back faster
Adrenomedullin
A natural peptide that relaxes blood vessels and helps the body keep fluid balance and blood pressure healthy.
Some human studies
Angiotensin (1-7)
The heart-friendly peptide that balances your blood pressure and protects your cardiovascular system.
Some human studies
Apelin-13
A natural heart hormone that helps your cardiovascular system work better and supports healthy blood flow throughout your body.
Some human studies
ARA-290 (Cibinetide)
A peptide that awakens your body's natural repair system to heal damaged nerves and reduce pain.
Some human studies
BPC-157
The "Wolverine peptide" known for its remarkable healing properties across tendons, ligaments, muscles, and the gut.
Animal studies only — extensive
Enalapril
The blood pressure champion that helped millions breathe easier and live longer.
Well studied in people
Intermedin (Adrenomedullin-2)
A powerful peptide hormone that protects your heart and blood vessels while managing stress and inflammation naturally.
Very few human studies
KPV (Alpha-MSH Fragment)
A three-amino-acid fragment of a natural hormone, studied for calming gut inflammation at its source.
Well studied in people
Larazotide
Restore your intestinal barrier and protect against gluten damage.
Well studied in people
Natriuretic Peptide (ANP)
Your heart's natural fluid and pressure regulator, helping restore balance when fluid overload strikes.
Some human studies
Nesiritide (BNP)
A lab-made copy of a natural heart hormone (BNP) that eases fluid overload and improves blood flow during acute heart failure.
Well studied in people
PACAP-38
A natural peptide messenger found throughout the brain and body that protects nerve cells and calms inflammation.
Well studied in people
PEG-MGF
A long-lasting version of your muscle's natural repair signal — modified to stay active for days instead of minutes, waking dormant muscle stem cells to rebuild damaged tissue.
Animal studies only — extensive
Pentadecapeptide (BPC Analog)
Nature's tissue-healing peptide from gastric juice—a 15-amino acid powerhouse for recovery.
Some human studies
Relaxin-2 (Serelaxin)
A lab-made copy of the pregnancy hormone relaxin, tested in acute heart failure to take strain off the heart and blood vessels.
Very few human studies
Substance P Antagonists
Drugs that block substance P — one of the body's main pain-and-nausea messengers — to cut those signals off at the source.
Some human studies
TB-500
A powerful fragment of thymosin beta-4 that acts like your body's repair signal—speeding up healing of muscles, tendons, and tissues by promoting cell migration and new blood vessel growth right where you need it most.
Some human studies
Thymosin Beta-4
The body's natural healing peptide that accelerates tissue repair and reduces inflammation.
Some human studies
Thymulin Analog (PAT)
A lab-made version of a thymus-gland hormone, studied for easing pain and inflammation.
Well studied in people
Ularitide
A lab-made version of a natural heart hormone, designed to help the heart pump better and shed excess fluid in acute heart failure.
Well studied in people
Urocortin
A powerful stress-response peptide that protects your heart and helps your body handle pressure.
Some human studies
VIP (Vasoactive Intestinal Peptide)
A natural peptide messenger that relaxes airways and blood vessels and calms inflammation — studied for lung and immune conditions.
Some human studies
Ziconotide (Prialt)
An FDA-approved painkiller derived from cone snail venom, delivered into the spinal fluid for severe chronic pain.
Well studied in people
18 guides
Weight loss
Studied for losing fat or managing appetite
5-Amino-1MQ
A small molecule that blocks a fat-cell enzyme called NNMT — studied in animals for fat loss and healthier metabolism. No human trials yet.
Animal and lab studies only
Adipotide
A targeted fat-destroying peptide that works like a smart missile, cutting off blood supply to fat cells and causing rapid weight loss in primate studies.
Animal studies only — extensive
AOD-9604
A modified fragment of human growth hormone that targets fat cells for breakdown without affecting blood sugar or muscle growth—your metabolism's precision tool.
Some human studies
Cagrilintide
A long-acting amylin analogue given once weekly. Alone it produced up to 10.8% weight loss over 26 weeks against 3.0% on placebo; the 20.4% figure people quote is the CagriSema combination with semaglutide, not cagrilintide on its own. Not approved anywhere — the combination is under FDA review.
Well studied in people
CagriSema
Cagrilintide and semaglutide together in one weekly injection. In the phase 3 REDEFINE 1 trial, people lost 20.4% of body weight over 68 weeks against 3.0% on placebo — 22.7% among those who stayed on treatment. Submitted to the US FDA in December 2025; not approved anywhere yet.
Well studied in people
Dulaglutide
A once-weekly GLP-1 injection (Trulicity), FDA-approved for type 2 diabetes — it lowers blood sugar, trims a few kilograms, and protects the heart.
Well studied in people
Exenatide
The first GLP-1 drug, derived from Gila monster venom (Byetta, Bydureon) — FDA-approved for type 2 diabetes in daily and weekly forms.
Well studied in people
Liraglutide
A once-daily GLP-1 injection — FDA-approved as Victoza for diabetes and Saxenda for weight loss, with heart protection proven in a 9,000-patient trial.
Well studied in people
Lixisenatide
A short-acting GLP-1 injection (Adlyxin) taken before the day's main meal to blunt after-meal blood sugar spikes.
Well studied in people
Mazdutide
A dual-action weekly injection that curbs appetite while raising calorie burn — around 20% weight loss in late-stage trials.
Well studied in people
Orforglipron
A daily pill for weight loss and diabetes — the first GLP-1 drug that's a simple small molecule instead of an injection. In late-stage trials.
Well studied in people
Pemvidutide
A dual-action weekly injection in trials for obesity and fatty liver disease — designed to burn liver fat while driving weight loss.
Some human studies
Pramlintide
A lab-made version of the hormone amylin, FDA-approved to smooth out after-meal blood sugar spikes in people who use insulin.
Well studied in people
Retatrutide
The world's first triple-action weight loss peptide that simultaneously activates three hormone receptors—GIP, GLP-1, and glucagon—delivering unprecedented weight loss results of up to 24% body weight in clinical trials.
Some human studies
Semaglutide
The revolutionary once-weekly GLP-1 medication that helps your body feel full faster and longer, leading to significant weight loss while also protecting your heart—FDA approved and backed by some of the largest clinical trials in obesity medicine history.
Well studied in people
Setmelanotide
An FDA-approved treatment for rare genetic forms of obesity caused by a broken appetite-signaling pathway in the brain.
Well studied in people
Survodutide
A dual-action weekly injection in late-stage trials for obesity and for liver disease caused by fat buildup.
Well studied in people
Tirzepatide
The dual-action powerhouse that targets both GIP and GLP-1 receptors, delivering the most dramatic weight loss results ever seen in a medication—averaging over 20% body weight reduction while also crushing blood sugar levels in people with diabetes.
Well studied in people
18 guides
Growth hormone
Nudges your body to release more growth hormone
Alexamorelin
An experimental peptide that converts to hexarelin in the body, triggering growth hormone release — little studied in humans.
Very few human studies
Capromorelin
An oral appetite-and-growth-hormone stimulator — FDA-approved for dogs and cats (Entyce, Elura), and tested in people for age-related muscle loss.
Some human studies
CJC-1295 (No DAC)
A modified growth hormone-releasing hormone that boosts your body's natural GH pulses for better recovery, deeper sleep, and improved body composition.
Some human studies
CJC-1295 with DAC
Long-acting growth hormone releaser that works around the clock to boost your body's natural GH production with just one or two injections per week.
Some human studies
GHRH (1-29)
The shortest fully active piece of growth hormone-releasing hormone. Approved in 1997 as Geref for children with growth hormone deficiency, then discontinued in 2008.
Human trials in children; one 19-person adult trial of a modified analogue
GHRP-2
A peptide that triggers a pulse of growth hormone. Approved in Japan — but only as a one-time diagnostic test for growth hormone deficiency, not as a treatment.
Approved diagnostic agent in Japan; no treatment approval anywhere
GHRP-6 (Growth Hormone Releasing Peptide-6)
A six-amino-acid peptide that signals your pituitary gland to release growth hormone, with early evidence of heart-protective benefits.
Very few human studies
Hexarelin
A powerful synthetic peptide that tells your pituitary gland to release more growth hormone — with heart-protective properties that make it stand out among GH boosters.
Some human studies
Human Growth Hormone (HGH)
The master hormone that acts as your body's repair crew—building lean muscle, burning stubborn fat, strengthening bones, and helping you recover like you did in your younger years.
Well studied in people
IGF-1 LR3
A supercharged version of your body's own growth factor that stays active 2-3 times longer than regular IGF-1, making it a powerhouse for muscle growth, recovery, and cellular regeneration.
Animal studies only — extensive
Ipamorelin
A uniquely selective growth hormone booster that tells your pituitary to release more GH without messing with your cortisol or other hormones—making it the 'clean' choice among growth hormone peptides.
Some human studies
Macimorelin
FDA-approved diagnostic test for adult growth hormone deficiency.
Well studied in people
MK-677 (Ibutamoren)
The growth hormone booster you take as a pill — it tricks your body into producing more GH, no needles required.
Some human studies
Pralmorelin (GHRP-2)
A six-amino-acid peptide that triggers growth hormone release — used clinically in Japan to test GH function, and studied for healing effects.
Very few human studies
Sermorelin
The original growth hormone booster that works with your body's natural rhythm—it tells your pituitary gland to release more GH instead of replacing it, keeping your hormonal feedback system healthy and balanced.
Some human studies
SM-130686
An experimental oral compound that boosts growth hormone — muscle-building potential seen in early research, but it was never brought to market.
Some human studies
Tabimorelin
An oral growth hormone booster that reached human trials before development stopped over drug-interaction concerns.
Some human studies
Tesamorelin
The only FDA-approved peptide specifically designed to melt away stubborn belly fat by telling your brain to release more growth hormone naturally—working with your body's own systems rather than replacing them.
Well studied in people
15 guides
Hormones
Works with testosterone, estrogen, or other hormones
Abarelix
A hormone-blocking injection that rapidly shuts down testosterone for advanced prostate cancer — without the temporary hormone surge older drugs cause.
Well studied in people
Buserelin
A lab-made hormone signal that shuts down sex-hormone production, used to treat prostate cancer, endometriosis, and infertility.
Well studied in people
Cetrorelix
A fertility-clinic staple that blocks the ovulation signal so eggs aren't released too early during IVF treatment.
Well studied in people
Degarelix
A fast-acting injection that shuts down testosterone within days, used to treat advanced prostate cancer.
Well studied in people
Fertirelin
A lab-made fertility hormone used mainly in veterinary medicine to trigger ovulation.
Some human studies
Ganirelix
A fertility-treatment injection that prevents eggs from being released too early during IVF cycles.
Well studied in people
Gonadorelin (GnRH)
The master hormone that controls your reproductive system and fertility.
Some human studies
Human Chorionic Gonadotropin (HCG)
A powerful hormone that mimics luteinizing hormone (LH) to stimulate your body's natural testosterone production while keeping your fertility intact—like having your cake and eating it too for men on hormone therapy.
Well studied in people
Leuprolide
An injection that dials down the body's sex-hormone production, used to manage prostate cancer, endometriosis, and early puberty.
Well studied in people
Nafarelin
A nasal spray that first stimulates, then quiets, the body's reproductive hormones — used for endometriosis and early puberty.
Well studied in people
Oxytocin Acetate
Often called the 'love hormone' or 'bonding molecule,' oxytocin is a powerful nine-amino-acid peptide that helps build trust, deepen social connections, and calm your stress response—essentially your brain's natural way of creating warmth and connection.
Some human studies
Prostamax
A four-amino-acid peptide from Russian research, studied for supporting aging prostate health. Human evidence is still thin.
Very few human studies
Testagen
A four-amino-acid peptide from Russian research, studied for nudging the body's own testosterone production back up in aging men. Human evidence is still thin.
Very few human studies
Triptorelin
An injection that reins in sex-hormone production to help manage prostate cancer, endometriosis, and early puberty.
Well studied in people
Vesilute
A two-amino-acid peptide from Russian research, studied for bladder and urinary function in aging. Human evidence is still thin.
Some human studies
14 guides
Skin & cosmetic
Studied for skin, wrinkles, and appearance
Acetyl Hexapeptide-3 (Argireline)
The 'Botox in a bottle' peptide — applied to the skin, it relaxes the tiny muscle signals that crease expression lines, no needles involved.
Very few human studies
Copper Tripeptide-1 (GHK-Cu)
A copper-carrying skincare peptide that boosts collagen, speeds skin repair, and helps protect against everyday damage.
Very few human studies
GHK-Cu (Copper Peptide)
A naturally occurring copper peptide that acts like a master switch for your body's repair systems—boosting collagen production, accelerating wound healing, and helping your skin rebuild itself from the inside out.
Animal studies only — extensive
Leuphasyl
A topical peptide that relaxes the muscle signals behind expression lines — a gentler, needle-free alternative to Botox.
Some human studies
Leuphasyl
A skincare peptide that softens expression wrinkles by quieting the nerve-to-muscle signal — often paired with Argireline for a stronger effect.
Very few human studies
Melanotan-2
A synthetic copy of the hormone that switches on tanning. Small human trials found it darkened skin without sun exposure and triggered erections in men with erectile dysfunction. It has never been approved by any regulator.
Very few human studies
Myristoyl Pentapeptide-17
A lash-and-brow peptide that encourages hair follicles to grow longer, fuller eyelashes and eyebrows.
Very few human studies
Palmitoyl Oligopeptide
A skincare peptide that signals skin to rebuild its supportive collagen-and-elastin mesh for firmer, more elastic skin.
Very few human studies
Palmitoyl Pentapeptide-4 (Matrixyl)
The Matrixyl peptide — a collagen-boosting skincare ingredient clinically shown to soften wrinkles and fine lines in sun-aged skin.
Very few human studies
Palmitoyl Tetrapeptide-7
A calming skincare peptide that dials down the low-grade inflammation that quietly ages skin.
Very few human studies
Palmitoyl Tripeptide-1
A collagen-stimulating peptide and one half of the popular Matrixyl 3000 anti-aging skincare duo.
Very few human studies
Snap-8
An advanced 8-amino-acid peptide that relaxes facial muscles from the outside in—think of it as 'Botox in a bottle' that you apply to your skin to smooth expression lines without needles or injections.
Some human studies
SYN-AKE
A lab-made peptide that mimics a snake-venom protein to briefly relax facial muscles and smooth expression wrinkles — applied topically, no needles.
Very few human studies
Tripeptide-29
The simplest building block of collagen, used in skincare to nudge skin cells into making more of their own.
Very few human studies
11 guides
Brain & focus
Studied for memory, focus, and mood
Cerebrolysin
A mixture of small brain-derived peptides used clinically in over 40 countries to support recovery after stroke, brain injury, and in dementia care.
Some human studies
Cerluten
A brain-tissue peptide blend from Russian research, studied for supporting brain-cell repair and recovery after stroke or injury. Human evidence is still thin.
Very few human studies
Cortexin
A brain-derived peptide preparation used clinically in Russia to support memory and recovery in stroke and other brain conditions.
Very few human studies
Dihexa
An experimental peptide that helps brain cells build new connections — striking results in animals, but it has never been tested in humans.
Animal and lab studies only
N-Acetyl Selank
A longer-lasting version of Selank — a calming, focus-supporting peptide designed to ease anxiety without sedation or addiction risk.
Very few human studies
N-Acetyl Semax Amidate
A stronger, longer-lasting version of Semax — a nasal-spray brain peptide studied for sharper focus, memory, and protection of brain cells.
Some human studies
Noopept (Omberacetam)
A tiny synthetic nootropic taken for memory and focus — active at doses about a thousand times smaller than piracetam, the classic study drug it was built from.
Very few human studies
P21 (P021)
An experimental peptide that encourages the brain to grow new neurons — promising in Alzheimer's animal studies, but not yet tested in people.
Animal studies only — extensive
Pinealon
A three-amino-acid peptide from Russian research, studied for shielding brain cells from age-related wear. The evidence so far is early and mostly from lab studies.
Animal and lab studies only
Selank
A clever brain-boosting peptide derived from your immune system's natural tuftsin molecule—it calms anxiety and sharpens your mind without the drowsiness or addiction risks of traditional anti-anxiety medications.
Very few human studies
Semax
A brain-boosting peptide that supercharges your cognitive function by ramping up BDNF—the protein your neurons need to grow, connect, and stay sharp—all delivered through a simple nasal spray.
Some human studies
7 guides
Longevity
Studied for slowing aspects of aging
Cartalax
A three-amino-acid peptide from Russian longevity research, studied for helping aging cartilage cells keep repairing joints instead of winding down. Human evidence is still thin.
Some human studies
Epithalon
A tiny but mighty four-amino-acid peptide that activates your body's telomerase enzyme—essentially helping your cells hit the 'reset' button on aging by protecting and lengthening the protective caps on your chromosomes.
Very few human studies
FOXO4-DRI
A senolytic peptide that clears aged "zombie" cells to support healthy aging — run in short, cycled courses a few times a year.
Animal and lab studies only
Glutathione
Your body's master antioxidant — a tiny three-part protein that shields your cells and helps clear out toxins.
Some human studies
Livagen
A four-amino-acid peptide from Russian longevity research, studied for switching aging immune cells' protein production back on. Human evidence is still thin.
Very few human studies
Ovagen
A three-amino-acid peptide from Russian longevity research, studied for protecting the liver and supporting its natural repair. Human evidence is still thin.
Very few human studies
Ventfort
A blood-vessel peptide extract from Russian longevity research, studied for keeping aging arteries flexible and cholesterol in check. Human evidence is still thin.
Very few human studies
4 guides
Metabolism
Studied for blood sugar and energy use
MOTS-c
A remarkable 16-amino-acid peptide encoded by your mitochondrial DNA that acts as an 'exercise mimetic'—boosting metabolism, improving insulin sensitivity, and helping your cells adapt to metabolic stress just like a good workout would.
Animal studies only — extensive
Pancragen
A four-amino-acid peptide from Russian research, studied for supporting the pancreas and steadier blood sugar. Human evidence is still thin.
Very few human studies
SLU-PP-332
A groundbreaking exercise mimetic compound that tricks your body into thinking it's training for a marathon—boosting metabolism, burning fat, and building endurance without you ever having to hit the gym.
Animal studies only — extensive
Xenin-25
A natural gut hormone that works alongside your other meal-time hormones to help keep blood sugar in check.
Some human studies
2 guides
Sexual health
Studied for libido and sexual function
Kisspeptin-10
A powerful reproductive hormone regulator that acts like the master switch for your body's fertility system—triggering the release of hormones that control everything from ovulation to testosterone production.
Some human studies
PT-141 (Bremelanotide)
The first FDA-approved peptide that works through your brain to reignite sexual desire—think of it as flipping the 'on' switch for arousal rather than just boosting blood flow like traditional ED meds.
Well studied in people
2 guides
Cell energy
Targets mitochondria — the power plants inside your cells
NAD+
Your cells' master energy currency and anti-aging powerhouse—NAD+ keeps your mitochondria humming, activates longevity genes called sirtuins, and helps repair DNA damage that accumulates as you get older.
Some human studies
SS-31 (Elamipretide)
A mitochondria-targeting peptide, FDA-approved in 2025 as Forzinity for the rare disease Barth syndrome — though larger trials in other muscle and eye conditions fell short.
Well studied in people