It's hard to say as it is such a short period of time. Many lose weight more quickly at first. I lost 8 pounds my first week of primal and 8 pounds my first week of the leptin reset (after months of eating crap + gaining some weight back). After that it slowed to anywhere from 0-4 pounds a week though usually hovering at around 2.
Leptin reset wise I lost 8, 3, 2, 0 pounds in the first 4 weeks. Last week I cheated some due to my sister being in town and us taking her out a lot. I think it was more excess calories compared to the actual foods themselves (high quality chocolate, gluten free baked goods etc) that caused a 0 loss that week.
As for your hidden ingredients, they are less than optimal but an actual stall is too early to call I think. Remember 2-3 pounds a week is good loss. That is 100-150 pounds in a year.