I saw this video earlier today and it got me thinking: nothing in the recipe for fresh ramen noodles (as opposed to instant ramen) requires a hechsher on its own, as the ingredients are: flour, water, kansui (an alum-rich water, traditionally sourced from lakes in Mongolia) and [sometimes] egg. They are packed while moist, rather than being dried in oil. Consequently: as they are also uncooked, should fresh, Asian-style noodles, require a hechsher?
I am not certain about Asia, but I can say that in some South American countries (e.g. Peru), flour is legally required to be enriched with vitamins and minerals -- which is most often from a "non-kosher source".
Unlike the U.S., where major flour brands are certified kosher, Peru’s two-year-old flour enrichment program has left kosher observant Jews searching for options. Vitamins and minerals added to the flour have a “non kosher source,” said Rabbi Blumenfeld. While a solution is sought, a friendly flourmill owner sets aside a monthly allotment of some 500 kilos of flour without additives for Chabad.