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 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 Oct 13, 2017 | Verified Purchase
The product works and the strong olive oil doesn't bother me so much. What do bothers me is the bottle - the dropper produce drops of different sizes I can't measure precisely. When every drop is 2000IU it's a big issue. You can find better products on the market
Posted by iHerb Customer on May 15, 2017 | Verified Purchase
Don't know if it works
Posted by iHerb Customer on Jan 28, 2014 | Verified Purchase
Not sure yet
Posted by iHerb Customer on Nov 28, 2012 | Verified Purchase
So far this product seems to be ok
Posted by funexplorer on Aug 28, 2012 | Verified Purchase
at first, i took a few more drops, my skin and liver get heated up, with redness and dun feel well with this. 2 drops is sufficient for me, too much will do more harm than damage. Get out in the sun for the most natural, life enhancing vitamin D and out in the nature with the sun help uplift one's mood too and also helps for a good night sleep with enough sunlight received during the day. Update: now i actually do feel the positive effect from this, when i wake up feeling cold and tired, and not wanting to move my limbs, with 2 drops of this, i have get the energy(warm) to move. happy with it without the side effect as before.
Posted by iHerb Customer on Jun 29, 2011 | Verified Purchase
Tastes like olive oil. Not so pleasant since I am used to a pleasant orange flavor. I guess I will adjust since the price is right.
Posted by iHerb Customer on May 24, 2011 | Verified Purchase
The drops are hard to control amount. I do not like how it is dispensed.
Posted by iHerb Customer on Apr 13, 2011 | Verified Purchase
My only complaint is that an actual dropper bottle be used. This strange dropper is held upside down and the drop falls to your tongue. This will work until the bottle is about half full. It would have been nice if a dropper was included, but I can purchase one and replace the system in place. My kids take this on a piece of bread and love it. I give it to them weekly in a large dose rather than small doses every day. My doctor did this with me. If I can find a dropper that fits, I will buy this product again.
Posted by iHerb Customer on Sep 30, 2010 | Verified Purchase
First nothing is coming out, then multiple drops.
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