What is the best peptide for libido?

PT-141 (Bremelanotide) has the strongest evidence. It's the only FDA-approved peptide for sexual desire. It works in both men and women by targeting melanocortin receptors in the brain. Effects typically start 45 minutes after injection and can last 12-24 hours.

How is PT-141 different from Viagra?

Viagra increases blood flow — it helps with the physical mechanics. PT-141 works in your brain to increase sexual desire and arousal. They target completely different systems. PT-141 addresses "wanting," Viagra addresses "functioning." Some people use both.

Does Melanotan II affect libido?

Yes. Melanotan II activates the same melanocortin receptors as PT-141, so increased libido is a known side effect. But it also causes tanning, nausea, and facial flushing. PT-141 was developed to isolate the sexual effects without the tanning.

Sexual Health Peptides

Peptides for libido enhancement, sexual function, and reproductive hormone support.

New to sexual health peptides? Start with PT-141

FDA-approved, well-studied, as-needed dosing

Sexual health peptides target libido, arousal, and reproductive hormone signaling. They work through melanocortin receptors in the brain — a completely different pathway from PDE5 inhibitors like Viagra or Cialis.

PT-141 (Bremelanotide, brand name Vyleesi) is the standout. It's FDA-approved for hypoactive sexual desire disorder in women and works for both men and women by activating MC4 receptors in the hypothalamus. Unlike Viagra, it addresses desire itself, not just blood flow.

Melanotan II also activates melanocortin receptors but is primarily known for tanning. Its sexual side effects led to the development of PT-141 as a more targeted compound. Kisspeptin-10 takes yet another approach — it stimulates GnRH release, which drives testosterone and estrogen production upstream.

Quick Comparison

Peptide	Route	Frequency	Half-Life	Status	Grade
Carbetocin (Duratocin/Pabal)	IM	Single dose	33-55 minutes	Research	A
Gonadorelin	SubQ	2x/week	2-4 min	FDA Approved	A
HCG (Human Chorionic Gonadotropin)	SubQ	3x/week	~33 hours	FDA Approved	A
Atosiban (Tractocile)	Intravenous	Single dose	Initial: ~13 min	Research	B
Kisspeptin-10	SubQ	Daily	~4 min	Research	B
Leuprolide (Lupron)	SubQ	Daily	~3 hours	FDA Approved	B
Melanotan I	SubQ	Daily	~15 hours	FDA Approved	B
Oxytocin	Nasal	Daily	~3 min	FDA Approved	B
PT-141	SubQ	As needed	~2.7 hours	FDA Approved	B
Triptorelin	SubQ	Single dose	~3-8 hours	FDA Approved	B
TRT (Testosterone Replacement Therapy)	IM	Weekly	~8 days	FDA Approved	B
Melanotan II	SubQ	Daily	~1-2 hours	Research	C

All Sexual Health Peptides(12)

Melanotan II

·Daily·Research

Melanotan II is a synthetic analog of alpha-melanocyte stimulating hormone (α-MSH).

Melanocortin AgonistTanningSexual Function

PT-141

·As needed·FDA Approved

PT-141 (Bremelanotide) is the only FDA-approved peptide for hypoactive sexual desire disorder — marketed as Vyleesi.

FDA-ApprovedMC4R AgonistSexual Health

Kisspeptin-10

·Daily·Research

Kisspeptin-10 is the active fragment of kisspeptin, the master regulator of the hypothalamic-pituitary-gonadal (HPG) ...

Reproductive HealthFertilityGnRH Stimulation

Oxytocin

/·Daily·FDA Approved

Oxytocin is a nine-amino-acid neuropeptide produced in the hypothalamus and released by the posterior pituitary.

Sexual HealthMood RegulationAnxiety Management

Gonadorelin

·2x/week·FDA Approved

Gonadorelin is a synthetic version of gonadotropin-releasing hormone (GnRH), the 10-amino-acid peptide your hypothala...

FertilityHormonal Regulation

HCG (Human Chorionic Gonadotropin)

·3x/week·FDA Approved

HCG isn't technically a peptide — it's a glycoprotein hormone produced naturally during pregnancy.

FertilityHormonal Regulation

Triptorelin

·As needed·FDA Approved

Triptorelin is a synthetic decapeptide analog of gonadotropin-releasing hormone (GnRH), with a D-tryptophan substitut...

PCTHormonal RegulationGnRH Agonist

Melanotan I

·Daily·FDA Approved

Melanotan I (afamelanotide) is a synthetic 13-amino-acid peptide analog of alpha-melanocyte stimulating hormone (alph...

MC1R AgonistTanning PeptideFDA-Approved

TRT (Testosterone Replacement Therapy)

·Weekly·FDA Approved

Testosterone Replacement Therapy (TRT) is the medical use of exogenous testosterone to restore serum levels in men di...

TestosteroneTRTHormone Replacement

Leuprolide (Lupron)

·Daily·FDA Approved

Leuprolide acetate is a synthetic nonapeptide analog of naturally occurring gonadotropin-releasing hormone (GnRH/LHRH).

GnRH AgonistFDA-ApprovedProstate Cancer

Atosiban (Tractocile)

·As needed·Research

Atosiban is a synthetic nonapeptide analogue of oxytocin that acts as a competitive antagonist at both oxytocin (OT) ...

Reproductive HealthTocolyticPreterm Labor

Carbetocin (Duratocin/Pabal)