Frequently Asked Questions
Answers to the most common questions about peptide research, reconstitution, sourcing, and this platform.
What Peptides Are Used For
What are peptides used for?The research areas peptides cluster into, and why “used for” on this site means what a study examined rather than what a vendor advertises.
What specific peptides are used for (4)
BPC-157
The specific injury models the research examined, what a rodent model can and cannot establish, and how a tendon study in rats became “the healing peptide”.
Full answerRetatrutide
Which indications have reported and which are still running — organised by how far the evidence has actually travelled, not by what the compound might do.
Full answerSemaglutide
Which indication sits on which brand's label, what the trials behind them measured, and why a research-market vial carries no indication at all.
Full answerTirzepatide
The three approved indications, the programme behind each, and what the GIP arm does and does not explain about the results.
Full answerReconstitution & Preparation
How are peptides reconstituted?Why any volume works, what the water actually changes, and the handling steps that protect the material — the general version of the per-compound maths.
The needle gauge and length commonly used for subcutaneous peptide injection, and the insulin-syringe barrel sizes that pair with them.
Full answerWhether insulin syringes are the right tool for subcutaneous peptide injection (yes), the U-100 unit system, and how the markings map to peptide doses.
Full answerHow the amount of bacteriostatic water sets the concentration (mg ÷ mL), the commonly used range, and a worked 10 mg / 2 mL example — with the math on the calculator.
Full answerReconstituting specific peptides (3)
Retatrutide
There is no single correct volume — the water sets the concentration, and the concentration sets the syringe units. The reference table converts vial size and volume into units for the trial dose points.
Full answerSemaglutide
The volume-to-concentration-to-units arithmetic for the 5 mg and 10 mg vials, tabulated against the labelled dose ladder.
Full answerTirzepatide
The volume-to-concentration-to-units arithmetic for the 10, 30 and 60 mg vials, tabulated against the labelled ladder — including where a vial cannot hold a dose at all.
Full answerDosing
How are peptides dosed?Why two kinds of dosing figure circulate, how to tell them apart, and what half-life has to do with injection frequency.
Dosing for specific peptides (4)
BPC-157
Why no trial-established dose exists, where the 250 and 500 mcg figures actually came from, and what the species extrapolation behind them assumes.
Full answerRetatrutide
The doses the retatrutide trials actually administered — Phase 2's 0.5-12 mg range and the Phase 3 TRIUMPH escalation — and why no approved dosing standard exists.
Full answerSemaglutide
Why there is no such thing as “the semaglutide dose” — four labels, four ceilings and four different missed-dose rules, each attributed to the label it comes from.
Full answerTirzepatide
The labelled escalation ladder and its ceiling, why the steps are four weeks apart, and the missed-dose rule as the labels actually write it.
Full answerDosing Frequency
How often are peptides dosed?Why one compound appears weekly and another several times a day, what titration is actually for, and how to read a schedule nobody ran a trial on.
Frequency for specific peptides (6)
BPC-157
Why there is no established BPC-157 dosing frequency — the circulating numbers are convention, and the cited evidence is animal-model plus one small human case series.
Full answerCJC-1295 + Ipamorelin
Why the pair's frequency splits by half-life — CJC-1295 DAC weekly vs no-DAC CJC and Ipamorelin multiple times daily — with the combination's no-trial caveat.
Full answerRetatrutide
The once-weekly subcutaneous schedule and every-4-week titration the retatrutide trials used, reported from the profile's cited Phase 2/3 protocols.
Full answerSemaglutide
The once-weekly injectable schedule (0.25→2.4 mg), the Ozempic/Rybelsus variants, and the every-4-week titration the semaglutide trials and label used.
Full answerTB-500
Why there is no established TB-500 dosing frequency — the loading/maintenance numbers are convention, and the cited studies are mechanism/wound-healing with an animal-estimated half-life.
Full answerTirzepatide
The once-weekly subcutaneous schedule and every-4-week titration (2.5→15 mg) the tirzepatide trials and FDA label used.
Full answerSide Effects
What are the side effects of peptides?Why a general answer is mostly an absence, what the documented effects look like where they exist, and why injection-site reactions are the one common thread.
Side effects of specific peptides (7)
BPC-157
Why there is no characterised human side-effect profile, what “no toxic dose identified” does and does not mean, and the angiogenesis question the literature leaves open.
Full answerIGF-1 LR3
The one cited IGF-1 LR3 side effect (hypoglycemia) versus what is not established — the analog has no controlled human trials, and the cited sources leave the IGF-1/cancer question open.
Full answerKLOW
Why there is no blend-level side-effect data for KLOW — no trial has studied the four-peptide combination, so side effects are per-component, and each component's human safety data is limited or absent.
Full answerRetatrutide
The reported rates with the trial behind each, the dysesthesia finding that is specific to retatrutide, and what trial safety data does not tell you about a research-market vial.
Full answerSemaglutide
The reported rates with the trial behind each, why escalation is when they cluster, and what a label warns about that a trial did not measure.
Full answerTB-500
Why there is no characterized human side-effect profile for thymosin beta-4 / TB-500 — human exposure is two terminated Phase 2 trials, the cited studies are animal wound-healing mechanism, and the tumor question stays theoretical.
Full answerTirzepatide
The reported rates with the trial behind each, the head-to-head discontinuation figure, and what a boxed warning drawn from rodent data does and does not establish.
Full answerTestosterone & TRT
What is TRT?Prescribed testosterone for diagnosed hypogonadism — what the guideline requires before treatment, which formulations are FDA-labeled, and what the reference ranges and the cardiovascular-safety trial actually reported.
Two FDA labels, the 2018 Endocrine Society and AUA guidelines, and the published literature on peak-to-trough management and sub-weekly dosing in practice — what each named source states.
Full answerWhat the classic intramuscular testosterone enanthate label, the weekly-subcutaneous Xyosted label, and the 2018 Endocrine Society guideline each state about injection frequency.
Full answerWhether testosterone can be injected subcutaneously — the FDA-approved weekly SC product, the intramuscular-only classic labels, and a published SC-vs-IM pharmacokinetic comparison.
Full answerWhat the published onset-of-effects review (Saad et al. 2011) reports about when testosterone therapy's effects appear and peak, domain by domain.
Full answerThe harmonized normal testosterone reference range (264–916 ng/dL) from Travison 2017 and the Endocrine Society's 264 ng/dL diagnostic threshold — with the caveat that ranges vary by lab and assay.
Full answerThe 2018 Endocrine Society monitoring schedule for testosterone therapy — testosterone and hematocrit at baseline, 3–6 months, and annually; PSA and a prostate exam for men 40+.
Full answerThe DHT mechanism behind androgenetic alopecia and why TRT-specific hair-loss outcomes are not quantified in the cited literature — mechanism known, outcome not established.
Full answerAbout This Site
Still have questions?
Browse the Peptide Library for detailed compound-specific information, check the Supplement Library for evidence-based supplement profiles and supplement FAQs, or explore the Research Hub for in-depth guides.
Need help with technical terms? Browse the Research Glossary for plain-English definitions. Ready to calculate a dose? Try the Dosage Calculator.
