KPV

Your body makes a signalling molecule called alpha melanocyte stimulating hormone, a chain of 13 of the building blocks that proteins are made from, written out as SYSMEHFRWGKPV. KPV is the last three of those building blocks, lysine, proline and valine, and that is the whole compound. Short chains like this are called peptides. Almost every claim made for KPV borrows the reputation of the full 13 unit molecule it was cut from, and in 2003 one lab put the two side by side and the borrowing did not hold.

The story sold with it is that it calms inflammation the way the parent molecule does. In 2003 three researchers put the parent and its fragments into the same immune cells, the ones that swallow germs whole, alongside a drug built to hit the same docking points. The parent and that drug both switched off two inflammation signals. KPV did nothing, not to those signals and not to the cells. The same team then asked whether KPV touches those docking points at all, by measuring the messenger a cell puts out when a docking point fires: the drug pushed it up, a blocker pushed it down, and KPV moved it neither way, so it was neither switching them on nor blocking them. In mice, KPV still calmed colon inflammation with those docking points blocked and in animals bred without a third one, and the authors concluded it was unlikely to be working through that receptor family at all. What does look real is in the gut. The lining of your intestine carries a transporter whose job is hauling two and three unit scraps of digested food into the cell, KPV is three units long, so it rides in on that. In mice bred without that transporter, the peptide did nothing at all. Take away the food door and the effect disappears.

It is sold three ways, as something to inject under the skin, as something to swallow, and as a cream for the skin, and the injected form is the one with the best marketing behind it. What the published research is actually about is calming inflammation in the gut of a rodent. The skin claims trace back to films laid on surgical wounds in diabetic mice, and the writer of the entry could not locate the paper being cited for them. Vendor pages also carry cycling patterns, 8 on and 8 off, or 5 on and 2 off, with no source behind them.

The expensive mistake is buying the injected form on the strength of the parent molecule's research. The 2003 experiment put the fragment next to the parent, in the same cells, on the same day, and the fragment did nothing the parent did, and that paper still turns up in the opening paragraph of product pages cited as support. Of the three forms being sold, the injection has the best marketing and the worst evidence, which is none, in any species. What the published work shows is a local gut treatment for rodents that only works because a food transporter carries it into the cell.

Nothing has been published about side effects in a person, because no published report exists of anyone giving KPV to a person by any route, and there is no case series from people who have used it either. Every result on record is in rodents or in cells in a dish. The entry names no safety or toxicology study in any species, so the empty record here means untested rather than clean.