The origin story of the snake oil trope is kinda cool. Apparently the concept was brought over to the US by Chinese railroad workers. It was made from the oil of the Chinese water snake which is high in omega-3's that actually do reduce inflammation. Unfortunately there were no Chinese water snakes in America, and the American hucksters started juicing rattlesnakes. And then... other even cheaper substitutes like beef tallow, mineral oil and turpentine. [1]
I suspect the Erabu sea snake is the Chinese water snake that was originally juiced? I don't think rattlesnake oil would have the same effect :)
Effect of Erabu Sea Snake (Laticauda semifasciata) Lipids on the Swimming Endurance of Mice https://karger.com/anm/article-abstract/51/3/281/41756/Effec...