Calcium carbonate is used as an anti-caking agent in a lot of products, but they also probably put it in almond milk to ease the minds of the lactose intolerant who sub out almond milk for calcium-rich cowâs milk. Sunflower lecithin â or any lecithin â is an emulsifier.ereâs Blue Diamondâs take on unsweetened almond milk: Ingredients: almondmilk (filtered water, almonds), calcium carbonate, tapioca starch, sea salt, potassium citrate, carrageenan, sunflower lecithin, natural flavor, vitamin a palmitate, vitamin d2 and d-alpha-tocopherol (natural vitamin E).