Don't take a lot of Vitamin D, which can be toxic when overdosed.The doctors that I trust suggest a lot of vitamin D and a very lot of Vitamin C.
Plus rest, stay warm and drink lots of water.
1000IU is considered safe, 2000IU is probably the max people should take without testing.
For those that don't absorb it and testing proves it more can be taken, but followup testing should be done to ensure they are not overdosing.
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