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G5K hCG refers to a 5,000 IU (International Unit) presentation of Human Chorionic Gonadotropin (hCG), typically supplied as a lyophilized (freeze-dried) powder vial.
• Molecular Type: A heterodimeric glycoprotein hormone composed of alpha and beta subunits (237 amino acids).
• Function: It mimics luteinizing hormone (LH) and stimulates LH receptors, triggering testosterone production in men or ovulation/follicular maturation in women.
• Medical Uses: Prescribed under brand names like Pregnyl or Novarel for female fertility treatments, male hypogonadism, sperm production, or testosterone/fertility preservation during testosterone replacement therapy (TRT).
• Half-Life: Roughly 30 hours, with peak testosterone effects occurring about 72 to 96 hours after administration.
G5K Sourcing & Context
• Research Standards: In laboratory and endocrinology settings, "G5K" or 5,000 IU vials are often marketed or referenced as research-grade peptide standards.
• Reconstitution: A 5,000 IU vial is typically reconstituted using a solvent such as bacteriostatic water or sterile saline. Common clinical or research protocols use 1 mL to 2 mL (or more) of liquid depending on the desired concentration per tick on an insulin syringe.
• Athletic / Bodybuilding Context: While sometimes discussed in off-label or non-medical athletic/bodybuilding circles for post-cycle testosterone restoration, hCG is a banned substance by the World Anti-Doping Agency (WADA) and carries risks such as estrogen spikes, water retention, and receptor desensitization