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The Mg was just by itself, not blended with anything. I have switched to another brand now, that I get from the same internet site. This Mg costs more than the discontinued one, so I'm looking around for options. The one I have now, other than the price, is fine.
It's more the formulation than the brand that I look for ... I was told that any variety of Mg ending in "-ate" is most absorbale, so that's what I look for: Mg malate, orotate, citrate, aspartate, etc.