I don't think NAF give a specific timespan on the effectiveness of superflex, but with all supplements they do take time to be effective. I would give it at least 30 days if not longer.
I understood it that liquid is absorbed more quickly into the system. I started mine on the liquid, which lasted about a month and then put him on the powder.
umm, I never thought of that. I just thought that the powder would be easier to feed. I will still keep feeding it though, as she doesn`t show signs that she needs it, but I want it as a supplement to help her in case I am missing something as she is now 10 years old and as we compete, I want to do all I can to help her.