There was some confusion on the mailing lists recently about citric acid and ascorbic acid. Here's what you need to know.
Both citric acid and ascorbic acid are SCD legal. However, both of them are usually derived from corn. Corn is cheap and ubiquitous and a bane on our society, but I digress.
Generally speaking, citric acid and ascorbic acid are highly refined and should not cause problems. But there are some exceptionally sensitive individuals who react to whatever corn happens to be in these products. Of course, there are some people who just can't tolerate citric acid and/or ascorbic acid for whatever reason.
So. They ARE SCD legal. But that doesn't mean they won't give you a problem. So, if you notice a product giving you issues, then stop eating it. OK? OK. :)