The magnesium source in that brand is listed as "magnesium citrate/oxide." Citrate is great, but oxide is relatively useless as per the study I referenced. With

The magnesium source in that brand is listed as "magnesium citrate/oxide." Citrate is great, but oxide is relatively useless as per the study I referenced. Without knowing the exact ratio of the two it's difficult to say whether that would be a quality source.