Calcium. Depending on your diet, you may or may not need supplemental calcium. You can get a lot from leafy greens, tofu, yogurt, cheese, milk, sardines, salmon, etc. http://tinyurl.com/d8bvfbn around 900-1200 milligrams of calcium per day are enough. If you aren't getting this much in your food, calcium citrate is better absorbed than calcium carbonate. Use a product that also has vit d and vit k2.
None . Eat enough calcium-rich natural foods. Dairy products and calcium-fortified foods are the best sources of calcium. In many countries, fruit juices, cereals, and breads are fortified with calcium. The best calcium supplement is what you can adhere to with no adverse effects and is affordable. Calcium carbonate and citrate are commonly used calcium supplements; gluconate is given intravenously.