This is one of the biggest bio shops in Antwerp (if not the only big one). This company got shops all around Belgium. Unfortunately, they are killing all other little shops. Alas, Natuurhuis offers organic products of all kind, and some non-organic. You will also find vegan options, although it's not nice to have to walk by dead animals while searching for them. The trend in Belgium is to be "bio", however people don't seem to think about the murder of animals as such a bad thing as long as they are "bio". Strange. They even have posters of a so-called "eco" organization promoting their "meat" (Natuurpunt). Anyway, I recommend you to weight your fruits and veggies yourself before going to the cashier, and always check your receipt straight away, since they will overcharge you 3 out of 5 times, believe me, especially with the pay for weight products. Don't be afraid of telling them when they do so.
It's a disgrace that you cannot find a vegan (or even vegetarian only) shop in a big city like Antwerp (or in the flemish part of Belgium! -don't know about the french part-). More shops like Vega-Life in Amsterdam should exist.
Cons: "Bio" animals also suffer, They will overcharge you