MGF (Mechano Growth Factor): Reference Overview and Reconstitution Notes

MGF (Mechano Growth Factor)

What it is

MGF, or Mechano Growth Factor, is a splice variant of insulin-like growth factor 1 (IGF-1), also written as IGF-1Ec. It is a short peptide sequence that skeletal muscle expresses locally in response to mechanical loading or tissue damage, and it belongs to the broader growth-factor family. A pegylated form, PEG-MGF, is a laboratory modification designed to slow breakdown of the native peptide.

Research context and categorization

MGF is generally grouped under growth factors and tissue-repair signaling molecules. In laboratory literature it is commonly discussed in relation to skeletal-muscle biology: it is investigated for its reported role in activating satellite cells (muscle stem cells) and in the proliferation phase that precedes muscle repair and adaptation, which distinguishes it from systemic IGF-1 that is more associated with cell differentiation. Foundational work by Yang and Goldspink described the MGF E-peptide activating quiescent satellite cells in muscle-injury and stretch models, and MGF is studied as a locally acting autocrine and paracrine signal rather than a circulating hormone. These uses are investigational research applications only. They are not confirmed or approved clinical benefits, and effects described in cell and animal studies have not been established as safe or effective in humans.

Status

  • Regulatory status: Research-only. MGF (and PEG-MGF) is not approved by the FDA for any human or veterinary use.
  • Sport status: Prohibited under the WADA Prohibited List. Mechano growth factors are named explicitly in Section S2, under peptide hormones, growth factors, related substances, and mimetics (growth factors and growth factor modulators), and are banned at all times, both in-competition and out-of-competition.

Reconstitution notes (general)

Lyophilized (freeze-dried) peptides are reconstituted with bacteriostatic water before laboratory handling. The resulting concentration equals the milligrams of peptide in the vial divided by the millilitres of bacteriostatic water added. For example, dividing the vial's stated mass by the volume of water gives the concentration per millilitre. A reconstitution calculator is available at our reconstitution and blend calculators to work out concentration from vial size and water volume.

Dilution and handling notes (compound-specific)

MGF and PEG-MGF are supplied as a lyophilized powder, most commonly in 2 mg vials, and are reconstituted with bacteriostatic water. Typical practice is to add roughly 1 to 2 mL of water per vial, which keeps the solution dilute enough to measure conveniently while staying well within what the small peptide mass will dissolve. The powder generally goes into solution readily and does not tend to gel or precipitate the way some larger or more hydrophobic peptides do. To dissolve it, the water is directed slowly against the inside wall of the vial rather than sprayed onto the powder cake, and the vial is swirled or rolled gently, never shaken, since agitation can foam or stress the peptide. If a few particles remain, gently rotating the vial for a couple of minutes usually completes dissolution. A practical note specific to this compound: native (non-pegylated) MGF is understood to be short-lived once in solution or in circulation, which is the reason the pegylated PEG-MGF variant exists, so freshly prepared, well-labeled, and promptly refrigerated solutions matter here. A clear, colorless solution is expected; cloudiness, color, or visible floaters indicates the material should be discarded.

Handling and storage

Store the sealed lyophilized vial cold, and keep reconstituted solution refrigerated at 2 to 8 C, out of direct light. Wipe the rubber stopper with an alcohol swab and let it dry before drawing water. Label the vial with the mix date. Reconstituted peptide is generally considered usable for roughly a 4-week window under refrigeration, and should not be frozen once mixed. Discard the vial if the solution turns cloudy or discolored, or if floaters appear.

Related reading

Tools and supplies

For laboratory and research reference only. Educational content, not medical, dosing, injection, or therapeutic guidance, and not intended for human or animal use. Any research uses described are investigational and not confirmed or approved benefits. Confirm anything involving health with a licensed professional. References linked above.