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1. Treats magnesium deficiency. Magnesium citrate is a beneficial supplement for certain groups that have an increased chance of developing magnesium deficiency, specifically the older people and those with diabetics.
Quick Answer. Magnesium citrate generally works within three hours. However, the effectiveness of magnesium citrate depends on a number of factors, such as dosage, condition being treated and whether it is taken on an empty stomach. Drinking 8 ounces of water when taking magnesium citrate is the best way to speed up its effects.