Limited human dataFDA 503A Category 2

Kisspeptin side effects

Also known as: Kisspeptin-10 · KP-10 · Kisspeptin 10 · Metastin 45-54 · Kisspeptin-54

Updated Oct 24, 202620 sources

8 side effects reported for Kisspeptin: 6 from studies and labels, 2 from users and guides. 2 come with the ways people manage them.

Kisspeptin overview

Side effects reported in studies and labels

Rates as each trial or label states them. A rate from one trial does not carry over to research-grade vials or other doses.

From trials and regulators6

Clinical studies and regulatory documents.

Few side effects reported in trials
No serious adverse events in small, short studies of about 300 people given kisspeptin-10; many studies did not report side effects at all.
No reported side effects in sexual-desire trials
In the women's HSDD trial (32 completers), kisspeptin-54 was well tolerated with no reported adverse effects.
Loss of response with frequent or constant dosing
Twice-daily kisspeptin-54 nearly abolished the FSH response by day 2 in women with hypothalamic amenorrhea. Five days of constant kisspeptin-10 brought LH and FSH back to placebo levels in men.
How people manage it
- Intermittent schedules held up better: twice-weekly kisspeptin-54, or daily 8 hours on and 16 off for kisspeptin-10.
Shorter menstrual cycle
In healthy women on twice-daily kisspeptin-54, cycles averaged 26.8 days vs 28.6 on saline.
Weight gain and higher estrone (single report)
One FDA adverse event report in a teenager on compounded 100 mcg daily for six weeks. FDA said the timing and link were unclear.
Immune reaction to the peptide (theoretical)
No study has measured it. FDA flags immunogenicity as a risk for injected kisspeptin-10, higher under the skin than IV.

Side effects users and guides report

What people post and what dosing guides list. These are reports, not measured rates.

From users and guides2

Community reports, competitor and vendor guides, media.

Mild flushing, headache or brief nausea
Listed by one guide as occasional; no rates given.
Injection-site redness or itch
Occasional and mild, per guides; no rates given.
How people manage it
- Rotate injection sites.

Who should avoid it, and what not to combine

Drug-tested sportCondition
WADA's 2026 Prohibited List bans kisspeptin and its agonist analogues in male athletes at all times (S2.2.1).

How much is known

Limited human data

Human data are real but small and lab-based: IV boluses and infusions of kisspeptin-10 in healthy men, a 2026 study of 12 days of subcutaneous infusions in 7 men, and kisspeptin-54 trials for IVF, amenorrhea and low sexual desire. FDA found about 300 people given kisspeptin-10, no study longer than one day of dosing at the time, and no trial of the 100 to 200 mcg shots used at home.