Before a recent Mindoro trip, I bumped into a guy along EDSA with a giant jug of oil. Inside was a slowly decomposing piece of snakeskin. Or a preserved piece of snakeskin. I couldn't really tell.
He will fill a small bottle out for you for Php50. The oil is minty and unsettling. It is used for muscular pain and libido failure.

What a curiosity!