This is the best Calcium/Magnesium supplement I've ever had. You should become familiar with the fact there are different forms of the same vitamin; every form has a different absorption rate. Cheaper vitamins use poorly absorbable forms that damage your health and hurt your body. Garden of Life uses a higher quality form of calcium and magnesium among a few other things. Everyone has heard calcium and magnesium are good for bones, BUT they are also necessary to create tons of enzymes and hormones within the body. Calcium and magnesium is also great for athletes - they are responsible for a lot of muscle twitch reactions. You can also tell how much calcium and magnesium are in a runner and weight lifter's body just by how their muscles look (e.g. tense and tight vs. relaxed and soft). I take calcium magnesium because I have hyperthyroidism and cal/mag produces a calming effect on my body. It also helps me to reduce underarm perspiration and odor