A 28-yeаr-оld femаle presents tо yоur retаil pharmacy looking for a recommendation related to calcium supplements. She is in good general health and recently started a diet that has led to decreased consumption of dairy products. She no longer drinks milk but still consumes a serving of Greek yogurt each day. She doesn’t think she consumes other foods that are specifically fortified with calcium. She is very healthy, and her only prescription medication is a daily oral contraceptive. Which of the following calcium supplements would be the MOST appropriate to recommend to her?