Peptide Profiles

Two Hormones in One Vial Your gonads need two signals to work properly: FSH (follicle-stimulating hormone) and LH (luteinizing hormone). Most research compounds provide one or the other — HCG for LH activity, recombinant FSH for FSH activity. HMG provides both, simultaneously, from a single preparation. Human Menopausal Gonadotropin is extracted from the urine of […]

A frog peptide that’s 40 times more potent than morphine. Contains a “left-handed” amino acid that shouldn’t exist in animal biology. And it was discovered in the skin secretions of a South American tree frog. When Montecucchi et al. characterized dermorphin in 1981, it broke multiple rules of biochemistry at once — and opened entirely […]

The Discovery That Rewrote Reproductive Biology In 2003, two research groups on different continents independently made the same discovery: mutations in a single receptor gene caused complete reproductive failure — no puberty, no fertility, no gonadal function. That receptor was GPR54 (now called KISS1R). Its ligand was a peptide called kisspeptin. Overnight, kisspeptin went from […]

The Pregnancy Hormone That Does Way More Than Pregnancy Human Chorionic Gonadotropin (HCG) is best known as “the pregnancy hormone” — it’s what makes a pregnancy test turn positive. But reducing HCG to a pregnancy marker misses why it’s one of the most versatile research tools in endocrinology. Because HCG activates the same receptor as […]

Same Peptide, Two Radically Different Drugs CJC-1295 with DAC and CJC-1295 without DAC share a name and the same base peptide. That’s about where the similarity ends. The DAC (Drug Affinity Complex) modification changes the half-life by roughly 100-fold — which completely transforms the pharmacological profile. Choosing the wrong one for your experiment is like […]

A Tanning Peptide That Accidentally Became Much More In the late 1980s, researchers at the University of Arizona had a straightforward goal: create a peptide that would stimulate skin pigmentation without requiring UV exposure. A sunless tan in a vial. What they got was Melanotan II — a compound that does trigger tanning, but also […]

Your body produces IGF-1 naturally. It’s one of the most important growth factors in biology — driving cell growth, protein synthesis, and tissue development. But there’s a catch: the moment IGF-1 enters the bloodstream, binding proteins grab onto it. Six different IGF-binding proteins (IGFBPs) sequester most circulating IGF-1, limiting how much actually reaches target tissues […]

In 1977, two Swiss researchers did something beautifully weird: they took blood from a sleeping rabbit, filtered out the small molecules, and injected them into an awake rabbit. The awake rabbit fell into deep delta-wave sleep. Something in the blood was carrying a sleep signal. They isolated it, sequenced it, and named it delta sleep-inducing […]

There’s an enzyme in your fat cells called NNMT. Its job, essentially, is to slow down your metabolism — it degrades a methyl donor that cells need to produce NAD+, the coenzyme that powers cellular energy production. More NNMT activity → less NAD+ → slower metabolism → more fat storage. It’s a brake pedal on […]

Three amino acids. That’s it. Lysine-Proline-Valine — a tripeptide so small it barely qualifies as a peptide at all. But KPV has generated outsized research interest because this tiny fragment, snipped from the tail end of alpha-MSH, packs anti-inflammatory activity that works through mechanisms most conventional anti-inflammatory compounds don’t touch. Here’s what the published research […]