@BeamsOfEnergy I remember Georgi saying it I think, not sure, it's been a year since I wrote and used this

Intestinal absorption of magnesium from food and supplements

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A suggestion when dealing with gut microbial imbalances:

Supplemental Mg Meals with problematic ingredients Topical Typical everyday meals Oral 100 mg Meals with safe 'prebiotic' ingredients Oral >100 mg

This is considering it a microbial growth factor that's worth restricting or exceeding in each extreme.

The food content will add some more magnesium per meal and the total must not be too off from the efficient absorption range.