Charcoal. It's annoying to schedule the two-hour NPO gap around taking it. The capsules tend to float up and get stuck in my esophagus. If the charcoal hasn't had time to wet down, a small cloud of it comes up if I burp -- and it makes me burp. Good thing I don't smoke!
All this is to say that there are perfectly understandable reasons why I stopped taking it a few months ago. I was pushing way too hard; so hard that I quite literally didn't have the energy to eat enough at mealtimes. I had to eat what I could tolerate, then wait a while until I had enough energy to eat some more. Needless to say, this made scheduling around charcoal nearly impossible.
That's when I discovered that glucose could suppress the porphyria to some extent. I started to depend solely on glucose: tastes better, easier to schedule, and cheaper.
Well, I'm here to say: if you have porphyria, candy is dandy, but charcoal is more effective. (I couldn't get it to rhyme; I'm no Ogden Nash.) I recently resumed my charcoal regimen, and the improvement has been dramatic. It's definitely worth the extra trouble, time, and expense to use charcoal properly if you have a lot of porphyria.