PC2025 - In the Pоdcаst titled, "A Deep Deep Dive intо Mаjоr Minerаls in the Diet", the podcasters shared that the human gastro-intestinal (GI) tract can only absorb 500 mg at one time. Taking a calicium supplement of 1000 mg would be wasteful. The cool fact is dairy product usually contain 300 mg per serving and dark green vegetables contain 200 mg!