your friend seems Vit d3 deficient with his 19.9 ng/ml result and 47.8 pg/ml intact pth (which does not exceed laboratory limits but on the higher side). He shall start with 10000 (ten thousand) iu/ml daily and after a couple of months take intact pth, vitd3 and serum Ca tests again to watch the progress. Primary goal is to decrease intact pth level and to make sure Ca level stays between normal values. His Ca level is normal, he shall also take k2 vitamin to prevent its increase. Not all vit d3 has calcium, there are pure brands you can prefer. I think softjel ones are better for absorption, also if it includes olive oil it is better for absorption and it is better to take it with meal. The reason to limit Ca intake is very high levels of Vitd3 may increase blood Ca level which may be harmful in the long term. With a 10000 iu/ml daily dose and vit k2 I don't think it will cause a problem but taking serum Ca tests periodically will be a safer approach.
Here tablet are available with max quantity of 2000 ui vit D3.can he take 5 tablets a day? Or should he search for other having 10000 iu in it?