we have asked this question many times, we have asked our daughter's CF doc, her CF nutritionist and a very highly regarded pediatric GI specialist...and unfortunately there is not, as far as we have understood them<br><br>in addition, the regulation of enzymes (despite best efforts) is very hard. what i mean is that it difficult to "titrate" (if that is an appropriate term) enzymes (i also heard this from a women's whose job is to regulate supplements). so we think we are giving our kids "x" amount of lipase units/capsule but that is really a "best guess" or "average" as i understand it. if you were to "average" all the enzymes in the entire bottle you would get that average lipase units/cap that is listed on the bottle.<br><br>so even if there was a "formula" i.e. "x" amount enzymes for "x" amount of calories/fat, you could not guarantee the exact amt of enzymes in each cap.<br><br>we have been frustrated by this from the get go but doesn't sound like there is much that can be done except to "do our best"<br><br>there is a "new" non porcine type of enzyme being studied called liprotamase that potentially would help that somewhat (at the very least it is less susceptible to stomach acid and may reduce/eliminate the need for PPIs) but unfortunately, there is not that much info available and i am unsure when, if ever, it may come to market. Which is unfortunate, given the incidence and early manifestations of PI I would like to see more money/research being directed at improving digestion especially since we know the correlation between weight and lung function<br><br>sorry, got off an a little tangent.<br>good luck <br>