They're not good at math...
I just started using this, so I can't say anything about the effect yet.  I did want to comment on their math, though.  The Amazon ad say it's a 100 gram bottle.  On the label, it's clear that one serving is at least 2 grams, if not more (no indicator on how much Lecithin is added).  2 grams each of a 100 gram bottle is 50 servings, not 90.  Basic arithmetic failure...by experience, based on bottle and scoop size, I don't think I'll get more than 30 servings.
Rating: 4 stars