Does the bottle list the ingredients? I did a search on it, and couldn't find what it contains. That may be helpful in determining what exactly the carbon may absorb. If there are some sort of chemicals in the product, I would be hesitant to put it in my tank.
You could take your carbon out. If it has been in the filter for longer than 3 weeks, I wouldnt worry about it, it's useless after that time period anyways. Carbon is not necessary to have in your filter unless you are removing meds, tannins or odor from the water, and a few other things that I can't think of atm. The fine print says this because the carbon may absorb something that is in the pro phyll, thus making it work less effectively.