HCG
Also known as: Human chorionic gonadotropin · hCG
A naturally occurring gonadotropin hormone that mimics LH and is most associated with stimulating the testes to maintain their own testosterone production and size during testosterone-based protocols.
Class
Gonadotropin hormone
Default unit
IU
Common route
Subcutaneous or IM
Typical half-life
~24–36 hours
Frequency
Varies by use
Commonly associated areas
Illustrative map of the body systems HCG is most often discussed in relation to. Relative emphasis only — not a measure of efficacy or a medical claim.
Proposed mechanisms / pathways
What is HCG?
HCG, or human chorionic gonadotropin, is a naturally occurring glycoprotein hormone — not a synthetic research peptide — that the body produces in large amounts during pregnancy. Structurally it closely resembles luteinizing hormone (LH), which is why it is most associated with signaling the gonads. In a hormonal-support context it is discussed for keeping the testes active when the body’s own LH output is suppressed, such as during testosterone-based protocols.
How it is thought to work
HCG is thought to act as an LH mimic, binding the LH receptor on testicular Leydig cells and prompting them to continue producing testosterone and to maintain their size and function. Because exogenous testosterone can suppress the natural HPG axis, HCG is reported to help preserve endogenous signaling that would otherwise go quiet. Its role in fertility and post-cycle recovery is generally framed around this same LH-like stimulation.
Educational only — not medical advice
HCG is a prescription hormone in many regions, and nothing here is a recommendation, dose, or medical claim. Consult a qualified healthcare provider and follow the laws in your area before considering anything described above.
Tracking HCG in LynkDose
HCG is usually run on a recurring schedule alongside other hormonal protocols, so consistent logging keeps cadence and dosing clear. Record each dose, the IU amount, and the date in LynkDose, and note when bloodwork is drawn so results line up with your timeline. Over weeks, pairing these logs with subjective notes — libido, energy, or fullness — makes it easier to see how the protocol is trending rather than relying on memory.
Commonly discussed for
- Maintaining endogenous testosterone production during TRT
- Preserving testicular volume on exogenous androgens
- Fertility and post-cycle hormonal recovery
Often stacked: Often discussed alongside testosterone protocols to keep the gonads active, and sometimes with an aromatase inhibitor such as anastrozole to manage estrogen.
How to track HCG in LynkDose
HCG is typically dosed on a recurring schedule, so log each dose, the IU amount, and the date. Many also note bloodwork timing and any subjective changes in libido or fullness to make trends visible over a cycle.
Deeper read: How to Track a Peptide Cycle: A Complete Guide
Not medical advice
This page is educational and does not recommend, prescribe, or dose any compound. Many peptides are research chemicals not approved for general human use. Always consult a qualified healthcare provider and follow the laws in your area.