calcium gluconate vs. calcium chloride

a white, tasteless, water-soluble powder, CaC 12 H 22 O 14 , used as a dietary supplement to provide calcium.

a white, lumpy, deliquescent solid, CaCl 2 , usually derived from calcium carbonate by reaction with hydrochloric acid, or as a by-product of various commercial processes: used chiefly as a drying agent and preservative and for preventing dust.