I would make sure your magnesium is not OXIDE form, as that is not absorbed much orally.
You can try soaking in epsom salts the night before and see if you notice any improvement. If so, a topical cream applied to your spasming feet might help better than oral:
Magnesium Sulfate Cream from Kirkman
Not all oral mag gets to all body parts equally. Sometimes a topical form works more efficiently.
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Weezie looking at petunias 8.25.2017
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