Rusfertide

Oxytocin is a 9-amino-acid hormone made in the hypothalamus, famous as the chemistry behind labor contractions, breastfeeding, and social bonding. As an injectable drug it is FDA-approved to induce labor and control postpartum bleeding, but the intranasal 'love hormone' versions sold for trust, anxiety, and autism are experimental and the human results are genuinely mixed. The hype runs well ahead of the evidence.

Cetrorelix is a GnRH antagonist: a modified 10-amino-acid version of the brain's gonadotropin-releasing hormone that blocks its receptor instead of activating it. Sold as Cetrotide and FDA-approved since August 2000, its job in IVF is narrow and important: it stops the body's own LH surge from releasing eggs too early while the ovaries are being stimulated. It is a well-established fertility drug with decades of use, and it is not a tool for anything else people sometimes imagine it for.

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.

Leuprolide (brand name Lupron) is a synthetic GnRH agonist, a modified peptide far 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 (first US approval 1985), not a research peptide, and it carries meaningful side effects from the low-hormone state it creates.

Desmopressin (dDAVP) is a synthetic tweak of the natural hormone vasopressin, redesigned to keep the water-retaining effect while dropping most of the blood-pressure effect. First approved in the US in 1978, it is used for central diabetes insipidus, bedwetting, nocturia, and two bleeding disorders: hemophilia A and type 1 von Willebrand disease. This is settled medicine, not an experimental peptide, and its main real-world danger is straightforward: it can drop your blood sodium dangerously low if you drink too much fluid on it.

Octreotide is a synthetic eight-amino-acid mimic of the natural hormone somatostatin, the body's main 'off switch' for hormone secretion. It shuts down excess growth hormone, so it is a frontline FDA-approved drug for acromegaly, and it also tames the flushing and diarrhea of hormone-secreting carcinoid and other neuroendocrine tumors. This is real, approved medicine with decades of clinical data behind it, sold as Sandostatin (injectable, since 1988), Sandostatin LAR (monthly depot), and Mycapssa (oral capsule, approved 2020).