I have been prescribed vit d during my pregnancy. 2 tablets twice a daya but in first trimester it caused me swere nausea to the extend that I had to vomit as soon as I took these. So my midwife recommended atleast one tablet a day and increase tothe prescribed dosage as soon as I feel like.
Think it’s like 100 times higher than shop bought. I don’t remember the dose but do remember running out and thinking I could just take more of the off the shelf in the interim but realised it was near impossible.