I suggest you do some searching here on our site. Perhaps search for “ Rav Abadi”. He is our mentor and the exclusive posek we follow here for all Halachic rulings.
In general the simple view here, is that many myriad of items are kosher without a kosher certification. Rather because they use kosher ingredients. With the Rav’s guidance, and with practical knowledge of labeling laws we can ascertain which ingredients are kosher.