Canadian Nutritionist Suggests A2 Dairy May Help Avoid Acne Breakouts

Many people who love milk, yoghurt and cheese but struggle with acne often assume dairy must be completely cut from their diet. However, Canada-based nutritionist Sisley Killam, founder of The Acne Nutritionist, says there may be a simpler solution: switching the type of dairy you consume rather than eliminating it entirely. In a recent Instagram post, she explained that the issue may stem from a specific protein in most commercial dairy products rather than dairy as a whole.

Killam highlights the difference between A1 and A2 casein, two types of protein found in cow’s milk. Historically, all cows produced only A2 casein, but a genetic mutation in European herds led to the prevalence of A1 casein in many modern dairy breeds. According to Killam, A1 casein can be harder for some people to digest, potentially increasing gut permeability and inflammation — factors that can contribute to acne.

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To reduce the likelihood of breakouts while still enjoying dairy, Killam suggests opting for products that naturally contain A2 proteins or come from animals that tend to produce A2 milk. Her recommended items include water buffalo yoghurt and mozzarella, sheep-milk cheeses like pecorino and manchego, goat dairy products, and specially sourced A2 cow milk and yoghurt. She also notes that many European cheeses and butters come from breeds with A2 casein and may be easier to tolerate.

While scientific evidence on diet and acne is still evolving and some studies have found mixed associations between dairy and acne in general, individual responses vary widely. Some people may find switching to A2 dairy helps reduce inflammation and skin irritation, while others might choose dairy alternatives depending on their tolerance. Many dermatology experts also emphasize that acne has multiple causes — including hormones, genetics and skincare habits — and diet is just one factor among many.