Hexarelin vs PT-141 (Bremelanotide)

A detailed comparison to help you understand the differences and choose the right peptide for your research goals.

Hexarelin

Hexarelin is a potent synthetic hexapeptide growth hormone secretagogue. It provides the strongest GH release among GHRPs but is associated with rapid desensitization of receptors.

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PT-141 (Bremelanotide)

PT-141, also known as Bremelanotide, is a synthetic peptide analog of alpha-melanocyte-stimulating hormone. It is the only FDA-approved treatment for hypoactive sexual desire disorder (HSDD) in premenopausal women.

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Side-by-Side Comparison

Aspect	Hexarelin	PT-141 (Bremelanotide)
Dose Range	100 mcg–300 mcg	1.8 mg
Frequency	2x daily	Less than daily
Cycle Length	8–12 weeks	4–12 weeks
Route	subcutaneous	subcutaneous
Mechanism	Acts as a ghrelin mimetic with high potency at the GHS receptor. Provides powerful GH release but receptor desensitization occurs faster than with other GHRPs, requiring cycling.	PT-141 activates melanocortin receptors (MC3R and MC4R) in the central nervous system, particularly in areas associated with sexual arousal. Unlike PDE5 inhibitors, it works through the nervous system rather than the vascular system.
Typical Dosage	Typical dosing: 100-200mcg administered 2-3 times daily for 4-6 weeks, followed by an equal off period to allow receptor resensitization.	FDA-approved dose: 1.75mg administered subcutaneously at least 45 minutes before anticipated sexual activity. Not to be used more than once within 24 hours or more than 8 times per month.
Administration	Subcutaneous injection. Cycling is essential to maintain effectiveness. Often used in short bursts rather than continuous protocols.	Subcutaneous injection in the abdomen. Available as Vyleesi (commercial product). Research use may involve different dosing protocols.
Side Effects	Water retention, cortisol and prolactin increase, hunger (moderate), tingling, and potential blood pressure effects.	Common side effects include nausea (40% of users), flushing, headache, and injection site reactions. Transient blood pressure increases may occur.
Best For	Muscle Growth Recovery & Healing	Recovery & Healing