About this category
Recombinant and synthetic muscle-related peptides require both purity and identity confirmation. PEGylated forms add additional analytical complexity. We quantify intact protein by RP-HPLC and confirm identity by LC-MS, with SDS-PAGE available for larger constructs.
Featured peptides we test
IGF-1 LR3
9111 g/mol
IGF-1 LR3 is a modified analog of insulin-like growth factor 1 with an Arg substitution at position 3 and a 13-amino acid N-terminal extension. These modifications dramatically increase serum half-life and reduce binding to IGFBPs.
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MGF (Mechano Growth Factor)
2867.21 g/mol
MGF is a splice variant of IGF-1 produced in response to mechanical loading of muscle. It plays a role in satellite cell activation and muscle repair, making it a focus of muscle injury and regeneration research.
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PEG-MGF
~2867 + PEG g/mol
PEG-MGF is a pegylated form of mechano growth factor designed to extend the very short half-life of native MGF. The PEG modification allows broader systemic activity in muscle research.
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ACE-031
~76 kDa
ACE-031 is a soluble form of activin receptor type IIB (ActRIIB) designed to bind myostatin and related ligands, blocking their signaling. It has been studied in muscle wasting research.
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Sample submission
- Larger proteins (Follistatin, ACE-031) may need 1-2 mg.
- PEG-MGF identity requires intact mass MS in deconvoluted mode.
Common impurities
- Misfolded variants
- PEG conjugation variation
- Aggregates
Recommended tests
- RP-HPLC
- Intact Mass MS
- SDS-PAGE
- Endotoxin (LAL)
All Growth / Muscle peptides we test (6)
Growth / Muscle Testing Methodology
Our analytical workflow for growth / muscle peptides follows USP <1225> guidance for validated chromatographic methods. Every lot is processed by a credentialed analyst with documented chain of custody.
Step 1
Sample intake & cold storage
Each Growth / Muscle sample is logged with a chain-of-custody ID and stored at -20 °C upon arrival at our Florida lab.
Step 2
Reverse-phase HPLC purity
Samples are run on a C18 column using a water/acetonitrile gradient with 0.1% TFA, with UV detection at 214 nm to quantify main peak purity and named impurities.
Step 3
LC-MS / Orbitrap identity
Observed monoisotopic mass is compared against the theoretical mass for each growth / muscle compound to confirm identity. Blends are deconvoluted to quantify each active component.
Step 4
Optional residual & endotoxin testing
Residual solvents (GC-MS), residual TFA / acetate counterions, and bacterial endotoxin (LAL) are run on request based on intended downstream use.
Step 5
Signed Certificate of Analysis
Findings are compiled into a signed COA with chromatograms, spectra, instrument metadata, and analyst interpretation, delivered within 9-11 business days.
Growth / Muscle Purity Notes
Recommended research-grade purity for growth / muscle peptides is typically ≥ 98% by HPLC area. Synthesis-related impurities are common and only show up under proper analytical scrutiny.
Common impurities to watch
- Misfolded variants
- PEG conjugation variation
- Aggregates
What our COA confirms
- Main peak purity by HPLC area %
- Observed vs theoretical monoisotopic mass
- Named impurities ≥ 0.1% area
- Net peptide content where applicable
- Method, column, and instrument metadata
Growth / Muscle Handling, Storage & Safety
Guidance below is for laboratory and research personnel only. Growth / Muscle peptides are supplied for research use and are not intended for human or veterinary use.
Storage
Store lyophilized material at -20 °C, protected from light and moisture. After reconstitution, aliquot and store at -80 °C; avoid repeated freeze-thaw cycles.
Reconstitution
Reconstitute in bacteriostatic or sterile water in a clean environment. Allow vials to reach room temperature before opening to prevent moisture condensation on the powder.
PPE & shipping
Handle with gloves, lab coat, and eye protection. Ship samples to ACS overnight on dry ice or cold packs in a rigid, leak-proof container with a packing slip referencing your quote.
This page is informational and does not constitute medical advice. Consult your institution's safety officer and SDS before working with these compounds.
Frequently asked questions
Related testing resources
- HPLC purity testing for growth / muscle peptides
- Mass spectrometry identity confirmation (ESI-MS)
- Heavy metal and residual solvent screening
- LAL endotoxin testing for injectable peptides
- Peptide testing cost by assay
- How to ship peptides to our lab
- Independent third-party COA verification
- Peptide testing labs near me — all 50 states
- How to read a peptide Certificate of Analysis
- What peptide testing labs measure
Other peptide testing categories
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Healing & Repair Peptide Testing
BPC-157, TB-500, GHK-Cu, KPV, and other tissue repair peptides — purity, identity, and contamination testing.
Cognitive & Nootropic Peptide Testing
Selank, Semax, Cerebrolysin, Noopept, Dihexa, and related cognitive research compounds.
Immune & Anti-Inflammatory Peptide Testing
Thymosin Alpha-1, Thymulin, LL-37, ARA-290, VIP, and related immunomodulators.
Sexual Health Peptide Testing
PT-141 (Bremelanotide), Melanotan II, Kisspeptin, and related research peptides.
Mitochondrial & Longevity Compound Testing
NAD+, MOTS-c, SS-31, Humanin, 5-Amino-1MQ, BAM15, and related longevity research compounds.
Khavinson Bioregulator Testing
Epitalon, Pinealon, Vesugen, Vilon, Prostamax, Pancragen, and the full Khavinson short-peptide bioregulator family.
Compounded Peptide Blend Testing
Component-level analysis of compounded peptide blends such as Tesamorelin/Ipamorelin and Retatrutide/Cagrilintide.