PeptideGeekImmune system
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
Peptide Initiative research partner
Peptides, and everything you need to know to take them.
How much do I take? Where do I inject it? How do I mix the vial? What side effects should I watch for? Every guide answers the questions people actually search — in plain English, with every statement backed by a numbered, linked source from the Peptide Initiative research database.
plain-English peptide guides
published sources cited and linked
most-searched questions, answered wherever the research covers them
No hunting required
Every guide answers the six things people search for
We looked at what people actually type into Google. These six questions cover almost all of it — so they anchor the structure of every guide.
Question 01
How much do I take?
The studied doses — week-by-week schedules for escalated peptides, with how often and for how long.
Question 02
Where do I inject it?
The best injection spots and exactly how to do it, step by step.
Question 03
How do I mix it?
Reconstitution without the chemistry degree: what to buy and a worked example.
Question 04
When do I take it?
Morning or night, with food or without, and what it plays well with.
Question 05
What are the side effects?
The honest list — common, less common, and the ones that mean stop.
Question 06
When will I notice results?
A week-by-week picture of what's normal and what comes next.
Straight to the answer
The peptides people look up most
Ranked by real search traffic. Jump straight to the section you came for.
Immune system
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
Brain & focus
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
Metabolism
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
Sexual health
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
Cell energy
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
Weight loss
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
Skin & cosmetic
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
Metabolism
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
Weight loss
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
Hormones
Prostamax
A four-amino-acid peptide from Russian research, studied for supporting aging prostate health. Human evidence is still thin.
Very few human studies
Weight loss
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
Weight loss
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
Weight loss
Survodutide
A dual-action weekly injection in late-stage trials for obesity and for liver disease caused by fat buildup.
Well studied in people
Longevity
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
Brain & focus
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
Healing & recovery
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
Immune system
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
Immune system
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
Weight loss
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
Hormones
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
Sleep
DSIP (Delta Sleep-Inducing Peptide)
A naturally occurring brain peptide that helps you fall into deep, restorative sleep by gently nudging your body's own sleep-wake systems—without the groggy hangover of traditional sleep aids.
Very few human studies
Growth hormone
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
Skin & cosmetic
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
Start from your goal
What are you trying to do?
Immune system
Studied for supporting your body's defenses
24 guides
Healing & recovery
Studied for repairing tissue and bouncing back faster
23 guides
Weight loss
Studied for losing fat or managing appetite
18 guides
Growth hormone
Nudges your body to release more growth hormone
18 guides
Hormones
Works with testosterone, estrogen, or other hormones
15 guides
Skin & cosmetic
Studied for skin, wrinkles, and appearance
14 guides
Brain & focus
Studied for memory, focus, and mood
11 guides
Longevity
Studied for slowing aspects of aging
7 guides
Metabolism
Studied for blood sugar and energy use
4 guides
Sexual health
Studied for libido and sexual function
2 guides
Cell energy
Targets mitochondria — the power plants inside your cells
2 guides
Sleep
Studied for deeper, more restful sleep
1 guide
For the researchers
Need more peer-reviewed information with citations?
You can find full research profiles and clinical trial evidence that exports complete with citations.
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