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Not to be that guy, but if you have that much if a reaction to butter, you are probably allergic to milk proteins rather than lactose intolerant. Butter (and most cheese) is very low in lactose. Of course, everyone is different (I'm lactose intolerant myself, so I avoid milk and cottage / ricotta cheese, but can eat butter and curd cheeses)

I don't think my original comment was the place to elaborate on the various processes I took to identify my intolerance! However, suffice it to say that I can consume some low-lactose items such as hard/dry cheeses with minimal effects, but when I cook or bake with butter, my body seems to react with some mild aversion. The problem, in this specific case, might be the massive quantity of chocolate chip cookies I tend to consume...

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