There is lots of research out now on vitamin D. It is actually a hormone and not a vitamin. It was misclassified as a vitamin when it was first discovered. You have vitamin D receptors all over your body proving it has influence on many biological processes. As time goes on science will learn more of what it does but below are just a few know positives about maintaining a high vitamin D level: It is an important immune system modulator. It is also important in helping calcium get into the bones and teeth. It helps insulin get into the cells slowing or preventing insulin resistance. It has been shown to reduce the risk of colon, breast, bladder, and thyroid cancer. It has been shown to reduce the risk of stroke. It can slow the onset of autoimmune diseases. It can help Most people to supplement. Especially those who can not get enough vitamin D from sun exposure. This is especially true of those living in Colder claimants as the angle of the sun is too shallow to be effective in receiving enough uv-b radiation needed to make D. You should get your Vitamin D levels measured every year at your annual physical with a 25-hydroxy vitamin D test. You may be surprised how low your level is. Most functional medicine doctors and ND's agree that a healthy level should be 50-100 ng/ml. Many lab ranges are 30-80. So be aware of this discrepancy. Many MD's still do not measure it and those that do subscribe to out dated lab ranges. It is best absorbed with your largest meal of the day and taking it with some fat helps in the absorption. This product is in olive oil (a very stable oil) which provide some fat. Beware of other D drops that are in less stable oils like sunflower oil. Oils like this can go rancid much easier. These drops are a very economical way to purchase your vitamin D and I have always been satisfied with Nature's Answers quality. If you found this review helpful, kindly visit my iherb home page for more value added reviews. "Yes" helpful votes are appreciated. Peace and good health
Posted by iHerb Customer on Jun 10, 2010 | Verified Purchase
This is Vitamin D, mixed with olive oil, its pretty good.
Posted by iHerb Customer on Jan 14, 2010 | Verified Purchase
Great price for high potency drops! Flows easier than others I've tried that became too sticky to use!
Posted by iHerb Customer on Dec 10, 2009 | Verified Purchase
Also, easy to swallow and digest.
Posted by iHerb Customer on Nov 17, 2009 | Verified Purchase
Love that the bottle is glass and it's nice to find a high IU of vitamin D with a good price!
Posted by iHerb Customer on Jan 15, 2015 | Verified Purchase
A staple in my supplement routine, very easy to take and a nice change from swalloing tablets. Tastes slightly of olive oil. A great product, which I think everyone who live outside the equator should be taking!
Posted by iHerb Customer on Nov 18, 2010 | Verified Purchase
The first time I purchased it, it had a regular squeeze-top dropper. Now it has a dropper top, which makes it a bit more difficult to get the drops out! I prefer the squeeze-top dropper. Still, the product inside the bottle is great, and you cannot beat the value.
Posted by iHerb Customer on Feb 06, 2010 | Verified Purchase
Good luck finding it in stock! Olive oil taste is strong, unlike the Carlson Labs product which uses coconut oil.
Posted by iHerb Customer on Apr 28, 2016 | Verified Purchase
Love the formula, hate the fact the drops will not come out easily. Very frustrating dropper. Will not buy again.
Posted by iHerb Customer on Nov 07, 2013 | Verified Purchase
It takes ages to get a single drop out of the dropper. This is very frustrating. This was not the case so I suppose they changed the dropper for safety reasons although there is no need since the cap has a safety lock. Other than that it is a good vitamin D3.
Posted by iHerb Customer on Feb 19, 2011 | Verified Purchase
I do not like the "dropper" for this product. It makes accurate dosing very difficult.