The cereal contains honey so it is not vegan.
The sugar is questionable (if made in the U.S., chances are it was made using bone char from animals). Sometimes sugar is made from sugar beets in which case it is vegan (American Crystal sugar company is a company that uses beets to make their sugar for example), and most organically labeled sugars are not processed using bone char. That would be something you would have to contact the makers of the cereal to find out. Some cereals will label themselves vegan and usually those use organic sugars.
I didn't see any vitamin D content in there. Sometimes D3 (cholecalciferol) is added which is sourced from either lanolin or fish. D2 (ergocalciferol) is plant based and vegan. There is also now vegan D3 sourced from lichens but usually a product with this type of D3 will state this and usually it is only vegan specialty products that use it. At any rate, this is something to watch for.
Aside from the honey, and possibly the sugar, I didn't see anything else. I personally would not buy it due to the honey.