What Is Cortisol?
Category: Biology
A stress hormone produced by the adrenal glands. Some GH peptides like GHRP-2 and GHRP-6 can slightly elevate cortisol levels, while ipamorelin does not.
Detailed Explanation
Cortisol is a steroid hormone produced by the zona fasciculata of the adrenal cortex. Often called the 'stress hormone,' it plays crucial roles in metabolism, immune function, and the body's response to stress. In peptide research, cortisol is relevant because some growth hormone releasing peptides (GHRPs) can stimulate cortisol release as a side effect, which is undesirable for many researchers seeking clean GH elevation.
Practical Context
When choosing a growth hormone secretagogue, cortisol elevation is an important consideration. Ipamorelin is preferred by many researchers specifically because it provides GH release without significantly affecting cortisol or prolactin levels, making it the 'cleanest' GHRP available. GHRP-2 and GHRP-6, while effective for GH release, can modestly elevate cortisol, which may be undesirable for researchers focused on body composition.
Frequently Asked Questions
Which GH peptides don't raise cortisol?
Ipamorelin is the primary GHRP known for not significantly elevating cortisol. GHRH analogs like CJC-1295 and Sermorelin also do not meaningfully raise cortisol.
Related Peptides
- Ipamorelin - A selective GH secretagogue with minimal effect on cortisol or prolactin. (Dosage | Calculator)
- GHRP-2 - A synthetic GHRP that stimulates GH release with less appetite stimulation than GHRP-6. (Dosage | Calculator)
- GHRP-6 - A hexapeptide that stimulates growth hormone release and increases appetite. (Dosage | Calculator)
Related Terms
- GHRP (Growth Hormone Releasing Peptide) - A category of peptides that trigger growth hormone release from the pituitary gland. Examples include Ipamorelin, GHRP-2, and GHRP-6.
- Ipamorelin - A selective growth hormone secretagogue (GHRP) known for being the 'cleanest' GH peptide with no significant effects on cortisol, prolactin, or appetite.
- Secretagogue - A substance that promotes the secretion of a hormone. GH secretagogues stimulate the pituitary gland to release growth hormone naturally, unlike exogenous HGH which directly introduces the hormone.