Great product, based on actually raising my Vitamin D levels (25-hydroxy). After I bought these I saw the “how much do you need to raise your D” formula by the Vitamin D council and it was clear that 7,000 IU would be more appropriate for me, so I then also bought the similarly-formulated Country-Life 1,000 IU softgel product and take two of those at the same time as one of these. Based on the studies, I try to take my D with a meal every day, especially one containing fat. For reasons I won’t go into, I retested my 25-hydroxy D at one month instead of the intended three months, and my level has already gone up from 20 to 40! Based on previously seeing my levels go *down* after 1 month on 1,000 IU of a dry D product taken at night, I was pleasantly surprised at how well it is working. I can’t say I feel any different (at least not yet). And VERY IMPORTANTLY, I am monitoring very closely for any possible D-induced increase in my serum calcium, as having elevated (or even near-elevated) serum calcium generally confers MUCH more serious health risks than having below-range D. So far so good on that count, though, but since my serum calcium’s in the high-9’s already I need to be careful. Once I’m where I want to be on the D (ideally about 50 or 60), my “dilemma” will be figuring out how much to take ongoing to sustain that level instead of either continuing to increase or dropping back down.
Posted by iHerb Customer on Feb 09, 2011 | Verified Purchase
Contrary to the recent research findings on higher dosages of this vitamin, whenever I took a 5000 IU or more I suffered from lethargy and sleepiness.