8 Peptides

Best Peptides for Fertility & Reproductive Health

Peptides researched for fertility support, hormone regulation, and reproductive function in both men and women.

8Total Options

3FDA Approved

Understanding Fertility Peptides

Fertility peptides work by regulating the hypothalamic-pituitary-gonadal (HPG) axis - the hormonal cascade that controls reproduction. Kisspeptin is a key signaling peptide that triggers GnRH release, which in turn stimulates LH and FSH production. Gonadorelin (synthetic GnRH) is FDA-approved for diagnostic testing and has clinical applications in fertility. These peptides can help restore natural hormone production, which is particularly relevant for men recovering from testosterone replacement therapy or anabolic steroid use.

Key Considerations

Gonadorelin is FDA-approved for diagnostic evaluation of gonadotropic function
Kisspeptin has shown positive results in clinical fertility trials
Men recovering from TRT/steroids commonly use these for hormone restoration
Female fertility applications are being actively researched
Work with a reproductive endocrinologist for fertility concerns

FDA Approved Options (3)

Gonadorelin

FDA Approved

Also: GnRH, LHRH, Factrel

Gonadorelin is a synthetic copy of natural GnRH (gonadotropin-releasing hormone), a 10-amino-acid peptide (pGlu-His-Trp-Ser-Tyr-Gly-Leu-Arg-Pro-Gly-NH2) that tells the pituitary to release LH and FSH. It is FDA-approved for evaluating pituitary function and has historical use in inducing ovulation. In the peptide world it is mostly used off-label to keep the testes working during testosterone replacement, and the catch is that timing matters enormously: pulse it and you stimulate, give it continuously and you shut the system down.

Typical Dosing

100-500 mcg 2-3x weekly

HormonalView Details

HCG (Human Chorionic Gonadotropin)

FDA Approved

Also: Human Chorionic Gonadotropin, Chorionic Gonadotropin, hCG

HCG is a hormone produced in pregnancy that happens to be an almost perfect mimic of luteinizing hormone. That single fact is why it has two completely unrelated uses: it is an approved fertility medicine, and it is the standard tool for keeping the testicles working during testosterone therapy. It is also the basis of the discredited HCG diet, which is a separate story and not supported by evidence.

Typical Dosing

250-500 IU, 2-3x weekly (TRT adjunct)

HormonalView Details

Leuprolide

FDA Approved

Also: Lupron, Eligard, Leuprorelin

Leuprolide (brand name Lupron) is a synthetic GnRH agonist, a modified peptide about 20 times more potent than natural GnRH, and it is FDA-approved for advanced prostate cancer, endometriosis, uterine fibroids, and central precocious puberty. The clever part is counterintuitive: it works by overstimulating the GnRH system so hard that the pituitary shuts down sex hormone production. It is a real, long-established prescription drug, not a research peptide, and it carries meaningful side effects from the low-hormone state it creates.

Typical Dosing

Variable - depends on formulation

HormonalView Details

Research Peptides (5)

These peptides are being researched but are not FDA approved. They should only be considered for research purposes or under medical supervision.

Kisspeptin

Clinical Trials

Kisspeptin is the master switch that tells your brain to start reproduction. It is a family of peptides (the full length is kisspeptin-54, with shorter active fragments KP-14, KP-13, and KP-10) made from the KISS1 gene, and it acts as the upstream trigger for the entire reproductive hormone cascade. It is not an approved drug, but it has been tested in real human trials for fertility, hypothalamic amenorrhea, and male hypogonadism, with promising early results.

HormonalLearn more

Testagen

Preclinical

Testagen is a synthetic Khavinson tetrapeptide (Lys-Glu-Asp-Gly, KEDG) marketed as a testicular bioregulator for male reproductive and hormonal support. It is one of the more obscure peptides in the family, with almost no peer-reviewed human data and no FDA or EMA approval. What exists is a single small Russian clinical report plus the general Khavinson gene-regulation theory, so confidence in any specific claim is low.

BioregulatorsLearn more

Ipamorelin

Clinical Trials

Ipamorelin is a synthetic pentapeptide growth hormone secretagogue developed by Novo Nordisk and derived from GHRP-1. It is researched mainly for stimulating the body's own growth hormone (GH) release, and was studied in humans primarily for postoperative ileus and gut motility rather than anti-aging. It is not an approved drug anywhere: it reached Phase II trials, was discontinued for insufficient efficacy, and is now sold only as a research chemical.

Growth HormoneLearn more

Survodutide

Clinical Trials

Survodutide is an injectable dual agonist that hits both the GLP-1 and glucagon receptors, developed by Boehringer Ingelheim and Zealand Pharma. It is being tested for obesity and for fatty liver disease (MASH), and it carries an FDA Breakthrough Therapy designation for MASH. It is still investigational and not approved for any use as of mid-2026.

Weight LossLearn more

GB-115

Clinical Trials

GB-115 is a synthetic dipeptide anxiolytic developed in Russia, chemically the amide of N-phenylhexanoyl-glycyl-L-tryptophan and described as a retro-analogue of cholecystokinin-4. Rather than acting like a benzodiazepine, it blocks cholecystokinin receptors, a different anti-anxiety route. It has been studied in animals and in a small pilot human study, but it is not an approved or widely available medication.

CognitiveLearn more

Frequently Asked Questions

What peptides help with fertility?

Kisspeptin triggers natural GnRH release, stimulating LH and FSH - the hormones essential for ovulation and sperm production. Gonadorelin (synthetic GnRH) directly stimulates gonadotropin release. Both have clinical trial data supporting fertility applications.

Can peptides restore testosterone after steroid use?

Gonadorelin and Kisspeptin can help restart the HPG axis after suppression from testosterone or anabolic steroids. They stimulate the body to produce its own LH and FSH, which signal the testes to produce testosterone. This is commonly used in post-cycle therapy.

Is Kisspeptin used in IVF?

Yes, Kisspeptin is being researched as a safer alternative to hCG for triggering ovulation in IVF cycles. Clinical trials show it effectively triggers egg maturation with a lower risk of ovarian hyperstimulation syndrome (OHSS), a serious IVF complication.