Research peptides, reviewed properly.
Every guide on this site is built from peer-reviewed literature and clinical trial data — not forum folklore. Start with the free dosage calculator, then read the review before you buy anything.
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The guides our readers use most.
Peptide Dosage Calculator
Reconstitution math done for you: mg per vial, water added, and exactly how many units to draw on a U-100 syringe.
RetatrutideRetatrutide: Complete Guide
The triple agonist with the largest weight-loss results yet reported — and no approval. Phase 3 data, dosing, cost, access.
RetatrutideRetatrutide Dosage Guide
Trial titration schedules with a week-by-week chart, plus the 6 mg step that was never actually in a trial.
RetatrutideWhere to Buy Retatrutide
How to vet a research supplier: COAs, HPLC and MS testing, purity claims, and red flags to avoid.
Buying guideBest Peptides for Weight Loss
GLP-1s, GIP co-agonists, and the compounds that actually have trial data behind them — ranked.
Buying guideBest Peptides for Fat Loss
Which compounds have body-composition data, and which fat burners failed their human trials.
Buying guideWhere to Buy Peptides
Four checks that separate a real supplier from a repackager, plus realistic price ranges.
Buying guideBest Peptides for Muscle Growth
The honest version: what growth hormone research actually found about lean mass and strength.
RetatrutideRetatrutide Side Effects
What the Phase 2 trials reported by dose, and why almost every tolerability problem is a titration problem.
RetatrutideRetatrutide Cost & How to Get It
Trial enrollment, the approval timeline, and real monthly cost by dose versus approved GLP-1s.
PT-141PT-141 (Bremelanotide)
The melanocortin agonist approved as Vyleesi: trial dosing, onset, and the blood pressure caution.
KPVKPV Peptide Guide
The α-MSH fragment being studied for gut inflammation and skin repair: mechanism, dosing, safety.
MOTS-cMOTS-c Peptide Guide
The mitochondrial-derived peptide behind the insulin sensitivity and exercise capacity research.
Growth hormoneCJC-1295 & Ipamorelin
How the pairing works, DAC versus no-DAC, blend vial math, timing rationale and side effects.
RepairBPC-157 Side Effects & Dosage
The gastric peptide with the deepest animal literature — and the angiogenesis question nobody has settled.
RepairTB-500 Guide
The thymosin beta-4 fragment: loading protocols, what the parent protein proved, and what it did not.
SafetyAre Peptides Safe?
What the research says about side effects, contamination risk, and why source purity matters most.
How we review
Four things we check before a peptide gets a recommendation.
1. Published evidence
We read the primary literature on PubMed and ClinicalTrials.gov. If human data does not exist, we say so plainly instead of implying it does.
2. Third-party purity data
A certificate of analysis with HPLC and mass-spec results, tied to the batch you actually receive — not a generic PDF from two years ago.
3. Dosing that matches trials
Reference ranges come from published protocols where they exist, converted into practical per-vial math with our calculator.
4. Supplier track record
Shipping reliability, batch consistency, responsiveness, and whether the company stands behind an order when something goes wrong.