Why Would Magnesium Supplements Give Me Cramps?


May 31, 2020
United Kingdom
I've started to see a correlation now. I've been supplementing different types of magnesium for around half a decade.

Recently I've started taking it (800mg) post-workout as opposed to before bed, as I eat only one meal a day and can therefore take it on an empty stomach after training.

I've noticed that the days I skip taking it, I don't seem to have any cramps, yet within 90 minutes of taking it after training I'll start to cramp up.

So what's happening here exactly?

Is it depriving my body of other minerals such as potassium? I eat potatoes almost daily so I wouldn't think that would be the case.

Anyone have any idea what's going on?


Jan 6, 2019
800 mg is a lot of magnesium. I've run on potassium/salt issues on doses half of that.


Thread starter
May 31, 2020
United Kingdom
800 mg is a lot of magnesium. I've run on potassium/salt issues on doses half of that.

Interesting. I always add pink Himalayan salt to my water for when I train, but I'll cut the magnesium back to 400mg and see how it goes from there
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