To maintain healthy bones, the two most common and effective generic supplements are calcium carbonate and calcium citrate. Calcium carbonate is cost-effective and should be taken with meals for best absorption. Calcium citrate is gentler on the stomach and can be taken with or without food. For the best results, look for a supplement combined with Vitamin D, which helps your body absorb the calcium. Generally, aiming for 1,000 to 1,200 mg of total calcium daily from both diet and supplements is ideal. I recommend discussing your specific needs with your doctor to determine the safest and most effective dosage for you.