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I had terrible acne and one of the main causes was milk, It's mostly about it being processed, I understand natural milk directly from a cow can be fine. If you take out lactose from it, you still have caseine, a protein that doesn't sintetize well in the human body. Also humans are the only creatures that keep drinking milk after they grow in adults, and definitely the only one that drinks the milk from another mammal. So your gf may have a point, although being a vegan seems like overdoing it, you should check out the cons of milk
