I posted the link to my blog post about chlorella earlier in this thread. I take Chlor-Essence brand, and their website has some great info about it.
http://chloressence.com/ You can order on their website, but my local health food store carries it, so I just buy it there. I take anywhere from 6 to 12 grams a day in pill form, depending on how bad my carb/sugar cravings are. Each pill is 500 mg, so that's 12 to 24 pills, but they are REALLY small and I can swallow 6 at a time.
A bottle of 300 costs me about $45 and will last me 15-30 days depending on how much I'm taking.
I've been taking it off and on for a year now, combined with a rice protein shake in the morning. I initially started taking it when I did a candida cleanse with our Traditional Chinese Medicine Doctor, and then continued taking it cause I loved the side effects. I rarely have blood sugar fluctuations any longer. I used to have BAD blood sugar highs and lows and intense sugar/carb cravings, but those have pretty much completely resolved now even though I'm not on the restrictive cleanse/treatment diet any longer. Plus I have PCOS and there's that whole insulin connection there, so it's quite amazing that I no longer experience those crashes even when I'm not sugar free.
Oh, and added bonus? My TOM went from being once every 3-6 months, to every 35 days like clockwork.
It hasn't been regular since I went off the pill in 2001!!!! I know it's likely the entire cleanse/treatment plan, not just the chlorella, but it definitely played a part.