Just a quick note. I have realised that many people take vit D to correct their vit D deficiency yet despite taking quite high doses of D3 their levels do not raise or they expierience negative, deficiency - like effects.
Do not forget to supplement magnesium while you are taking vit D3. Magnesium is essential for transforming D3 into its active form. Without sufficient amount of magnesium your body won't utilise D3 suplements.
Below link summarises vitD3 and magnesium connection.
Wish you all the best health!
Ps: I needed to stop erfa due to bad heart palpitations and 'jumps' in blood pressure I am stuck