Honestly, mama, both are okay pero mas commonly recommended ng doctors dito ang calcium carbonate kasi mas affordable at effective pa rin, yung mga kaibigan ko na pregnant or breastfeeding, mostly yan ang prescribed sa kanila. Pero ang calcium lactate ay mas gentle sa tummy if prone ka sa constipation or bloating, na common side effect ng calcium supplements talaga. Best talaga to ask your OB or pediatrician kung alin ang mas suited sa situation mo, especially if you have any digestive issues or if it's for your baby, they can recommend based sa needs mo specifically.