I've been on it. We did a check after I had been on it a good while, and just before my every 8 week IV, and there wasn't much in my blood stream. The doc upped it to every 6 week. He did another check after I had to get iron again, and there wasn't much in my blood stream. I told him let's just call it with all this stuff. I did the Remidcade and the Humira once a week, and let's just call it. He talked me into doubling the Entyvio to 600 mg. every 8 weeks since it is supposed to be a 8 week medicine. My feritine is currently at 8.1, and here I go again for IV's of iron, but I have only had one IV of the new amount, and that was on January 23rd. I asked him before we started about where do we draw the line as to if this works or doesn't work. He said 4 IV's or 8 months. So, i'll either skip it all or go on the Stelara, which I believe is self administered injections like the Humira, but only every 12 weeks.