Yes, unfortunately the Bayer Advanced Brush Killer Plus Concentrate will kill any plant it comes in contact with.
We do not carry or sell the Bio Advanced Brush Killer Plus Concentrate in a gallon size. We recommend reaching out the retailer where you purchased this from or contact the manufacturer for support at 877-229-3724
According to the manufacturer, after using the Bayer Advanced Brush Killer Plus Concentrate the re-entry is 8 weeks per grazer. Bayer Advance does NOT recommend applying their products in pasture areas.