Well, I guess the only test you could do "at home" is try and monitor your intake of milk products and their effects on you physically.

Try giving up milk products for a period of time--say, 4 to 6 weeks--and monitor again for any changes in energy levels, body function, and overall state of health. You may want to find some substitutes for milk products, such as almond milks or rice milks, while you do without dairy in general.

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Who looks outside, dreams; who looks inside, awakes.<br />C.G.Jung