Peptide Protocol IQ

Sexual Health Research

Melanocortin signalling and sexual-desire or erectile-function endpoints as measured by validated instruments.

Often described colloquially as “Libido and sexual function”. We use research terminology because the colloquial phrasing implies an outcome the evidence often does not support.

1 graded claim1 with human evidence1 compound

Compounds

Examined in this research area

Evidence

Claims in this area, strongest first

Ordered by evidence level so that the state of the field is visible at a glance rather than buried.

Bremelanotide

AStrongHigh confidenceHuman evidence

In premenopausal women with hypoactive sexual desire disorder, bremelanotide 1.75 mg as needed was associated with statistically significant improvement in desire and reduction in associated distress versus placebo.

What is not established

Effect sizes were modest and their clinical meaningfulness has been debated. Evidence in men and postmenopausal women is not established.

Supporting sources (2)
Randomised controlled trialHuman Identifier verified

Bremelanotide for the Treatment of Hypoactive Sexual Desire Disorder: Two Randomized Phase 3 Trials

Kingsberg SA, Clayton AH, Portman D, et al. · Obstetrics & Gynecology · 2019 · n = 1,267

Population
Premenopausal women with hypoactive sexual desire disorder
Endpoint
Change in FSFI desire domain and FSDS-DAO item 13 distress score
Route
Subcutaneous, as-needed
Quantity as reported
1.75 mg as needed
Frequency
As needed, not more than once in 24 hours
Duration
24 weeks

Result. Statistically significant improvement in desire and reduction in associated distress versus placebo. Effect sizes were modest.

Adverse events. Nausea, flushing, headache; transient blood-pressure increase and heart-rate decrease after dosing.

Limitations. Premenopausal women only. Effect sizes modest and of debated clinical meaningfulness. Not studied in men in these trials.

Randomised controlled trialHuman Identifier verified

Prespecified and Integrated Subgroup Analyses from the RECONNECT Phase 3 Studies of Bremelanotide

Multiple · Journal of Women's Health · 2022 · n = 1,267

Population
Premenopausal women with HSDD, subgroup analysis
Endpoint
Subgroup consistency of desire and distress endpoints
Route
Subcutaneous
Quantity as reported
1.75 mg as needed
Frequency
As needed
Duration
24 weeks

Result. Reported broadly consistent direction of effect across prespecified subgroups.

Adverse events. As reported in the parent trials.

Limitations. Subgroup analyses are hypothesis-generating and underpowered individually.

Last evidence review: 2026-08-23