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Straight answers on peptide basics, reconstitution, dosing math and safety — with links to our research guides and free calculator.
These are the questions new researchers ask most, answered conservatively and with the evidence gaps stated plainly. For compound-specific detail, see our research guides; for vial and syringe math, use the free reconstitution calculator.
Educational and research information only. Nothing here is medical advice, prescribing guidance or a recommendation to use any compound. Consult a licensed healthcare professional before any health decision.
A peptide is a short chain of amino acids — the same building blocks that make up proteins, just smaller. Many peptides occur naturally in the body as signalling molecules involved in repair, metabolism and hormone regulation. The compounds discussed in research communities are typically synthetic versions of these sequences.
It is mostly size. Chains of roughly 2 to 50 amino acids are usually called peptides; longer, folded chains are proteins. Insulin, at 51 amino acids, sits right on the boundary and is often described either way.
Almost none of them are. A small number of peptide-based drugs (such as semaglutide and tirzepatide) are FDA-approved medications, but most compounds covered in research communities — BPC-157, TB-500, GHK-Cu and similar — are unapproved research compounds. They have not been validated by any regulator for safety or effectiveness in humans.
Peptides in solution degrade quickly. Lyophilisation (freeze-drying) removes water and keeps the compound stable during shipping and storage. The powder is dissolved in bacteriostatic water — a process called reconstitution — shortly before use in a research setting.
It means the substance has not completed the clinical trial and regulatory process required to be sold as a medicine. Evidence may come from animal studies, in-vitro work or early human data. Everything on this site is educational research information, not medical advice or a recommendation to use any compound.
Reconstitution means dissolving a lyophilised (freeze-dried) peptide powder in a liquid — almost always bacteriostatic water — so it can be measured and drawn accurately. The amount of water you add sets the concentration, and the concentration is what turns a dose in milligrams or micrograms into a measurable volume.
Bacteriostatic water contains 0.9% benzyl alcohol, which inhibits bacterial growth after the vial has been punctured. Sterile water has no preservative, so a multi-use vial reconstituted with it carries a higher contamination risk. Single-use research can use sterile water, but multi-draw vials are normally paired with bacteriostatic water.
There is no single correct volume — it is a trade-off between concentration and measurement precision. More water makes each dose a larger, easier-to-measure volume; less water makes the vial more concentrated. A common research planning example: a 5 mg vial with 2 mL of water gives 2.5 mg/mL, so 250 mcg is 0.1 mL. Our reconstitution calculator does this math for any vial size and water volume.
Research handling guidance is consistent: aim the stream slowly down the inside wall of the vial rather than directly onto the powder cake, then gently swirl — never shake. Vigorous shaking can shear or aggregate fragile peptide chains.
Reconstituted vials are generally kept refrigerated at 2–8 °C, protected from light, and research references commonly cite a usable window of a few weeks, though this varies by compound. Freeze-dried powder is far more stable and is often stored refrigerated or frozen for longer-term keeping.
mg (milligrams) and mcg (micrograms) are amounts of compound — 1 mg equals 1,000 mcg. mL is a volume of liquid. 'Units' are the markings on a U-100 insulin syringe: 100 units = 1 mL, so 10 units = 0.1 mL. A dose in mcg becomes syringe units only after you know the concentration (mg/mL) of your reconstituted vial.
Divide your dose by the concentration, then multiply by 100. Example: a 5 mg vial with 2 mL of water is 2.5 mg/mL. A 250 mcg (0.25 mg) dose ÷ 2.5 mg/mL = 0.1 mL = 10 units on a U-100 syringe. The free reconstitution calculator on this site performs this conversion automatically.
Divide the vial strength by your dose. A 5 mg vial at 250 mcg per dose contains 20 doses; at 500 mcg per dose it contains 10. The calculator also shows a supply estimate so you can see how long one vial lasts at a given schedule.
Cycling means running a compound for a defined block of weeks, then taking a break, rather than using it continuously. Research references commonly describe 4 to 8 week blocks for many peptides, followed by time off to reassess. Long-term continuous-use safety data rarely exists for research compounds.
A stack is two or more compounds used together with a shared research goal — for example BPC-157 with TB-500 in soft-tissue repair research, or the GLOW and KLOW blends that combine several peptides in one vial. Combinations are almost never studied as combinations, so each component's evidence applies but the blend itself is extrapolation.
That is precisely what is unknown for most of them. Compounds like BPC-157 and TB-500 have extensive animal data but no large published human safety trials. Unknown long-term effects, unknown interactions and variable product purity are the three recurring risks. Nothing on this site is medical advice — consult a licensed healthcare professional before any health decision.
Anyone with a current or prior cancer diagnosis is frequently flagged in reviews because several repair-pathway peptides are angiogenic — the same vessel-forming pathway that supports healing can in principle support tumour growth. Pregnant or breastfeeding individuals, and anyone on prescription medication, should treat all research compounds as unknowns and speak with a clinician.
Many are. WADA prohibits growth-hormone secretagogues, GHRPs, IGF-1, BPC-157 and related classes. Tested athletes should assume any research peptide is prohibited unless explicitly confirmed otherwise.
Shaking the vial instead of swirling, adding water directly onto the powder cake, storing a reconstituted vial at room temperature, reusing needles, and misreading syringe units because the concentration was never calculated. The reconstitution guide and calculator on this site walk through the correct math step by step.
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Work through the math for your own vial with the free calculator, or read the evidence-based breakdowns for the most researched compounds.
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