What is the difference between magnesium gluconate and magnesium citrate?

Answers (1)

They are both magesium "salts"(chemical compounds made from magnesium and acid ions) . Magnesium gluconate is generally used as a magnesium supplement and magnesium citrate is used as a laxative.
See: http://www.drugs.com/mtm/magnesium-gluconate.html
http://www.drugs.com/cdi/magnesium-citrate-solution.html

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Which one has the most usable magnesium for the body?

Magnesium salts are poorly absorbed from the gastrointestinal tract. The sulphate or gluconate salts are probably the best choices for Magnesium supplementation.