@2buddy years ago, NIH did a comparison of AlgaeCal and regular otc calcium supplements and gave AlgaeCal a slight edge… I did my research on ConsumerLabs, very detailed on every level…i came up with New Chapter, similar but less magnesium, better for me—and cheaper…for quick looks at labels, look up a brand on Amazon and the labels are usually one of the pictures on the left. Also, i like to see a brand is 3rd party tested.