I've heart that coral calcium is one of the best-absorbed calcium sources because it's natural. I'm thinking about switching from my usual calcium citrate supplement.
D000818:Animals; D037421:Anthozoa / Q000737:chemistry*; D019355:Calcium Citrate / Q000008:administration & dosage; D002136:Calcium, Dietary / Q000008:administration & dosage* / Q000378:metabolism; D019587:Dietary Supplements; D006801:Humans; D007564:Japan; D008019:Life Style
D002136:Calcium, Dietary; D019355:Calcium Citrate