Interesting topic on milk.

Dr Cousens adviced to avoid dairy products because the animals are very poorly treated.
I sometimes have some cheese and little bits of milk.

Here is what Prubhupada said about milk.

The Torah teaches that in the years of wisdom one stops to drink milk, as one is no longer a child.

If we avoid drinking milk (non-biological) from the abused cows. We can supplement with vitamine B12 and avoid any danger of missing nutrients in the body.

I am a vegetarian, not a vegan (yet).

Describing milk as “liquid religiosity,” Prabhupada writes that it is effective for “maintaining the finer tissues of the brain for understanding higher aims of life.” In former ages great saints often subsisted only by drinking the one or two quarts of milk that householders would donate to them each day.

Now, unfortunately, people draw milk from the cow artificially, and when there is no milk the cow is sent to be slaughtered. “These greatly sinful acts,” Srila Prabhupada writes, “are responsible for all the troubles in present society. People do not know what they are doing in the name of economic development.”

https://back2godhead.com/lord-krsnas-cuisine-60/