Peptide Guide + Calculator
PEG-MGF Reconstitution Calculator & Guide
Pegylated Mechano Growth Factor
PEG-MGF is an experimental pegylated peptide marketed in performance and recovery communities as a longer-acting form of a synthetic mechano growth factor peptide. The terminology is easy to confuse with naturally expressed IGF-1 splice variants, and human evidence for administered PEG-MGF is essentially absent. This page separates endogenous MGF biology from synthetic MGF peptides, explains what pegylation is intended to do, reviews FDA and anti-doping status, and provides educational reconstitution math.
Evidence Snapshot
PEG-MGF research at a glance
Standardized regulatory and evidence context so research compounds, investigational drugs, and approved medications are not treated as if they have the same level of human evidence.
Regulatory status
Not FDA-approvedDevelopment / evidence stage
Preclinical / no established human program
No established development program
Human evidence level
No meaningful direct human therapeutic evidencePrimary mechanism
Marketed pegylated mechano-growth-factor / IGF-1Ec-related peptide associated with growth-factor signaling claims.
WADA context
Explicitly prohibited — S2Primary targets
Human intervention evidence
No peer-reviewed human clinical program establishing safety or effectiveness for PEG-MGF was identified in the 2026 review used for this comparison.
Human biology evidence
Native MGF and IGF-1 splice biology are studied, but those findings do not automatically establish the behavior of marketed PEG-MGF products.
Key takeaway
PEG-MGF has a particularly large gap between mechanistic marketing claims and direct human evidence.
Evidence labels describe the research base and regulatory context; they are not treatment, dosing, or use recommendations. Review dates describe the last BACToBasics source check for this evidence summary. Anti-doping rules can change and should be verified with the applicable authority.
PEG-MGF Reconstitution Calculator
Enter the vial amount, liquid volume, and amount you want to calculate. BACToBasics will automatically calculate concentration, liquid volume, and U-100 syringe-unit equivalents.
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Calculator values are educational math inputs only. They are not recommended preparation amounts, doses, or use protocols.
PEG-MGF Reconstitution Math
Reconstitution math starts with the amount contained in the vial and the liquid volume used in the calculation. Dividing the vial amount by the liquid volume gives the resulting concentration.
Example vial amount
2 mg
| Liquid Volume | Calculation | Concentration |
|---|---|---|
| 1 mL | 2 mg ÷ 1 mL | 2 mg/mL |
| 2 mL | 2 mg ÷ 2 mL | 1 mg/mL |
| 3 mL | 2 mg ÷ 3 mL | 0.6667 mg/mL |
This table demonstrates concentration math only. The liquid volumes shown are examples for comparison and are not preparation recommendations.
More Reconstitution Tools
Need to compare different liquid volumes or convert between mg, mcg, mL, and U-100 units? Use the dedicated BACToBasics calculator tools.
What is PEG-MGF?
PEG-MGF refers to a pegylated synthetic peptide associated with the mechano growth factor literature. It is commonly marketed as a modified, longer-lasting version of a synthetic MGF peptide. PEG-MGF is not an FDA-approved drug, and FDA states that it has not identified human exposure data for drug products containing PEG-MGF administered by any route.
What does MGF mean?
The term mechano growth factor, or MGF, originally arose from research on mechanically responsive IGF-1 gene expression in skeletal muscle. In humans, the IGF-1Ec transcript is often referred to as MGF because its expression can increase after mechanical loading or tissue injury. This endogenous transcript and its processing should not automatically be treated as equivalent to the synthetic peptide products sold online as MGF or PEG-MGF.
Endogenous MGF vs synthetic MGF peptide
A major source of confusion is that MGF can refer to an IGF-1 splice transcript as well as to a synthetic peptide derived from part of the IGF-1Ec E-domain. A detailed endocrine review noted that the synthetic 24-amino-acid peptide often called MGF had shown biological effects in experimental systems, but an analogous free peptide product had not been identified or isolated from cultured cells, conditioned media, animal tissues, or biological fluids. Claims about a synthetic MGF peptide therefore should not simply be presented as if they describe a known circulating human hormone.
What does pegylation mean?
Pegylation means attaching polyethylene glycol, or PEG, to a molecule. In drug development, pegylation is often used to alter properties such as degradation, solubility, distribution, or persistence in circulation. Online descriptions of PEG-MGF commonly state that pegylation makes the synthetic MGF peptide longer acting, but there is no established human pharmacokinetic study of commercially marketed PEG-MGF products that validates a specific duration of action.
What does laboratory research on MGF show?
Research on MGF-related biology is mixed and is largely preclinical. Some experiments using synthetic MGF E-domain peptides have reported effects on muscle progenitor cells, cell survival, or regeneration-related pathways. For example, one study found that an MGF E-peptide influenced human muscle progenitor cells in culture. These cell-culture findings do not establish that injected PEG-MGF improves muscle growth or recovery in people.
Not all MGF experiments have been positive
The MGF literature is not uniformly supportive. A 2014 study reported that the proposed MGF peptide had no apparent effect on the tested myoblast and primary muscle stem-cell systems, challenging some earlier claims about a distinct growth-promoting MGF peptide. This disagreement is another reason to avoid treating the mechanism or benefits of synthetic PEG-MGF as settled science.
Does PEG-MGF build muscle?
There is no reliable human clinical evidence showing that administered PEG-MGF increases muscle mass, strength, hypertrophy, or athletic performance. Muscle and cell studies involving endogenous IGF-1 splice variants or synthetic MGF-related peptides provide hypotheses, not proof of a bodybuilding effect in humans. Marketing claims about muscle gain should therefore be treated as unvalidated.
Does PEG-MGF improve recovery or injury healing?
MGF-related gene expression is associated with tissue responses to loading and injury, which is one reason PEG-MGF is marketed for recovery. However, there are no established human trials showing that administered PEG-MGF accelerates recovery from exercise, repairs muscle injuries, heals tendons or ligaments, or improves rehabilitation outcomes.
PEG-MGF vs IGF-1 LR3
PEG-MGF and IGF-1 LR3 are both discussed in performance-enhancing peptide communities, but they are different compounds. IGF-1 LR3 is a modified IGF-1 analogue designed to reduce binding to IGF-binding proteins, whereas PEG-MGF is marketed as a pegylated synthetic MGF-related peptide. Neither should be assumed to reproduce normal endogenous IGF-1 signaling in a physiologic way, and neither has an approved bodybuilding or recovery indication.
What does the 2026 clinical literature say?
A 2026 endocrinology review of performance-enhancing peptides included PEG-MGF among unregulated GH-IGF-1-axis compounds and highlighted the gap between online self-administration practices and clinical evidence. The review emphasized uncertainty in product composition, dosing, stacking practices, adverse effects, and efficacy, with some compounds in this market having no human studies at all.
FDA safety status
FDA currently lists PEG-MGF among bulk drug substances that may present significant safety risks in compounding. FDA states that compounded PEG-MGF may pose significant immunogenicity risk for certain routes and may involve complexities related to peptide impurities and API characterization. FDA also states that it has not identified human exposure data for PEG-MGF administered by any route and lacks important information needed to determine whether it could cause harm in humans.
Current U.S. compounding status
FDA's April 2026 update states that the nomination for Mechano Growth Factor, Pegylated was withdrawn, so PEG-MGF was removed from category 2 of the 503A bulk-substance nomination list. FDA also announced that it intends to consult the Pharmacy Compounding Advisory Committee regarding possible inclusion of PEG-MGF on the 503A Bulks List before the end of February 2027. This review process does not mean that PEG-MGF is FDA-approved.
What are the potential risks?
Because adequate human exposure data are lacking, a reliable adverse-effect profile for PEG-MGF has not been established. Potential concerns include immune reactions, peptide aggregation or impurities, product misidentification, uncertain potency, and risks related to manipulating growth-factor pathways. Risks inferred from IGF biology or other growth factors should not be presented as proven PEG-MGF adverse effects, but the absence of evidence should also not be mistaken for evidence of safety.
Is PEG-MGF prohibited in sport?
Yes. The 2026 World Anti-Doping Agency Prohibited List includes mechano growth factors under section S2.3, Growth Factors and Growth Factor Modulators. Substances in this category are prohibited at all times, both in and out of competition.
Research product vs regulated medication
A vial sold online as PEG-MGF is not equivalent to an FDA-approved pharmaceutical product. Research-market products may not have independently verified identity, sterility, concentration, purity, stability, or pharmacokinetics. A label stating a peptide name and quantity does not establish that the vial contains that exact compound or amount.
PEG-MGF reconstitution math
The calculator above performs concentration and volume math from the vial amount, added liquid volume, and selected target amount. The result is an arithmetic conversion only. It does not establish that a product is authentic, sterile, stable after mixing, appropriate for injection, or safe to use, and it is not a dosing recommendation.
Explore more about PEG-MGF
11 linksComparisons, research records, development tracking, blends, and related guides are available here when you want to go deeper.
Explore more about PEG-MGF
11 linksComparisons, research records, development tracking, blends, and related guides are available here when you want to go deeper.
Compare PEG-MGF
Direct comparison pages are selected from the indexable BACToBasics comparison catalog and update automatically as that catalog grows.
Research, updates & development
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PEG-MGF research & development updates
Open the public timeline of sourced research records and material development changes tracked by BACToBasics.
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ResearchPEG-MGF research sources
Open 1 curated research record for PEG-MGF.
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DevelopmentPEG-MGF clinical development
Preclinical / no established human program · No established development program. No established direct human therapeutic development milestone identified.
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Relevant glossary concepts
Definitions are matched against the guide's structured title, subtitle, description, and educational sections.
FDA-Approved
A status indicating that the FDA has approved a specific drug product for one or more labeled uses after reviewing the required evidence and manufacturing information.
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GlossaryConcentration
The amount of a substance contained in a given volume of liquid, such as mg/mL or mcg/mL.
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GlossaryPeptide
A chain of amino acids linked by peptide bonds.
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PEG-MGF FAQ
Tap a question to expand only the answer you want to read.
Is PEG-MGF FDA-approved?
No. PEG-MGF is not an FDA-approved medication. FDA currently states that it has not identified human exposure data for PEG-MGF drug products administered by any route.
Is PEG-MGF the same thing as naturally produced MGF?
No. Endogenous MGF terminology refers to mechanically responsive IGF-1 splice-variant biology, while products sold as PEG-MGF are synthetic pegylated peptides. These should not be assumed to be biologically identical.
Does PEG-MGF have human clinical trials?
FDA states that it has not identified human exposure data for drug products containing PEG-MGF by any route. Published research commonly cited for MGF involves gene expression, cells, animals, or non-pegylated synthetic MGF-related peptides rather than validated human PEG-MGF treatment trials.
Does PEG-MGF build muscle?
There is no reliable human clinical evidence establishing PEG-MGF as an effective muscle-building drug. Most supportive claims are extrapolated from preclinical MGF or IGF-related research.
Is PEG-MGF the same as IGF-1 LR3?
No. IGF-1 LR3 is a modified IGF-1 analogue, while PEG-MGF is marketed as a pegylated MGF-related peptide. They differ structurally and should not be treated as interchangeable.
Why is PEG added to MGF?
Pegylation is generally used to alter a molecule's pharmacologic properties, often with the goal of increasing persistence. However, there is no established human PEG-MGF pharmacokinetic study validating the specific half-life claims commonly repeated online.
Is PEG-MGF safe?
Human safety has not been established. FDA cites potential immunogenicity, peptide impurity, and API-characterization concerns and states that it lacks sufficient human exposure information to determine whether PEG-MGF could cause harm.
Is PEG-MGF banned by WADA?
Yes. WADA's 2026 Prohibited List includes mechano growth factors under S2.3, and that category is prohibited at all times.
Does the calculator recommend a PEG-MGF dose?
No. It only converts a user-entered vial amount and liquid volume into concentration and volume math. It does not recommend a dose or establish safe use.
Sources & References
7 sourcesOpen the references when you want to inspect the research and regulatory sources behind this guide.
Sources & References
7 sourcesOpen the references when you want to inspect the research and regulatory sources behind this guide.
FDA's current PEG-MGF safety summary: potential immunogenicity and impurity/API-characterization concerns; no identified human exposure data by any route.
Documents withdrawal of the PEG-MGF nomination and FDA's plan for future Pharmacy Compounding Advisory Committee consultation.
Endocrinology review distinguishing IGF-1 splice-variant biology from the synthetic MGF peptide and highlighting unresolved questions.
Cell-culture study involving a synthetic MGF E-peptide; useful mechanistic evidence but not a clinical PEG-MGF trial.
Experimental study challenging some proposed direct biological effects of the synthetic MGF peptide.
Contemporary endocrinology review discussing PEG-MGF and other unregulated performance-enhancing peptides, evidence gaps, and safety uncertainty.
Lists mechano growth factors under S2.3 Growth Factors and Growth Factor Modulators, prohibited at all times.
BACToBasics provides educational information and math tools only. This content is not medical advice, dosing advice, injection instruction, or a recommendation to use any peptide or medication.