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Fairly likely you are magnesium deficient...magnesium is a critical cofactors to vitamin D and even moderate D3 intake can trigger symptoms such as muscle cramps and heart rhythm changes. Unfortunately no easy way to accurately test a magnesium level, as it’s mostly intracellular and blood tests are pretty much useless

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Possible, but I think unlikely. These days, my diet mainly consists of Soylent and Vite Ramen, which together provide me with 105% of my DRV of Magnesium in the form of Magnesium Phosphate and Magnesium Gluconate, respectively.

Looking at the nutritional info for Soylent and Vite Ramen shows that they also contain Vitamin D - at the same DRV percentages.

If you're getting 105% of your magnesium from these items, then you're also getting 105% of your Vitamin D before taking any additional Vitamin D supplements/sun exposure.

Adding the 5000IU of Vitamin D3 would be increasing your intake to 5840IU (730% of DRV) - assuming you didn't ingest anything else fortified with Vitamin D.

Not a single person knows what optimal Vitamin D or Magnesium means for the population or for you individually. So it’s very difficult assumptions here, even with testing genetics plays a huge factor.

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