Soy is a funny thing. There’s a lot of “well I heard it from a dude at the gym that soy gives you cancer” information running around. There is very, very little scientific information based on studies to back up the concerns about phytoestrogens in soy protein causing problems in vivo with humans. Regardless: Keto Chow does not use any soy protein (which is the problem-child and what people can be allergic to). It does contain soy lecithin that is used as part of the whey protein concentration process. It’s unavoidable if you use whey protein. I’d prefer NOT to have it included just so I could avoid having to answer the inevitable questions/complaints about soy. Regardless, to quote the Dana-Farber Cancer Institute
Soy lecithin, extracted from soy-bean oil, is often used in numerous foods, like chocolate, to help keep ingredients emulsified. Many food labels will list a soy-based emulsifier like lecithin. The amounts are generally minute and don’t contribute a substantial level of phytoestrogens. Products with soy lecithin do not need to be avoided because they have such minor amounts.