Chalk is calcium carbonate, and so are many calcium supplements. So, no surprise on the chalky taste. I'd say it actually goes best with milk, I guess because i

Chalk is calcium carbonate, and so are many calcium supplements. So, no surprise on the chalky taste. I'd say it actually goes best with milk, I guess because it tastes "natural". A lot of milk substitutes are palatable and have calcium added, or likewise it's possible to buy milk with the lactose removed.