I take Ostelin D3 1000iu a day and within a month my Vitamin D level increased from severely deficient to moderately deficient. I was a bit disappointed and thought it should be higher but my GP said that Vit D is always hard to increase and just takes time. On prescription it cost me $5.90 without prescription it's $39.00

I was told that within another month it should be in normal range.

I've never had any side effects from the tablet whatsoever.

Oh, I forgot, my calcium level was below normal and it's now in the normal range.

Shows what an important vitamin that D really is!