HAVANA — Once a month for the last decade, Pepe Casanas, a 78-year-old Cuban farmer, has hunted down a scorpion to sting himself with, vowing that the venom wards off his rheumatism pains.

His natural remedy is no longer seen as very unusual here.

Researchers in Cuba have found that the venom of the blue scorpion, whose scientific name is Rhopalurus junceus, endemic to the Caribbean island, appears to have anti-inflammatory and pain relief properties, and may be able to delay tumor growth in some cancer patients.

While some oncologists abroad say more research is needed to be able to properly back up such a claim, Cuban pharmaceutical firm Labiofam has been using scorpion venom since 2011 to manufacture the homeopathic medicine Vidatox.

The remedy has proven popular.

In Cuba, where tens of thousands of patients have been treated with Vidatox, each vial costs under a dollar. On the black market abroad it can cost hundred times that - retailers on Amazon.com are seen selling them for up to $140.

"I put the scorpion where I feel pain," Casanas said while demonstrating his homemade pain relief with a scorpion that he found under a pile of debris on the patch of land he cultivates in Cuba's western province of Pinar del Rio.

After squeezing it long enough, it stung him and he winced.

"It hurts for a while, but then it calms and goes and I don't have any more pain," he said.

Every few days they feed and water the arachnids that sit on a bed of small stones. Once a month, they apply an 18V electrical jolt to their tails using a handcrafted machine in order to trigger the release of a few drops of venom.

The venom is then diluted with distilled water and shaken vigorously, which homeopathic practitioners believe activates its "vital energy." — Reuters