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 December 23 2015 | Verified Purchase
Very disappointing. The first bottle had leaked, so was only half full. The next, is so slow with the drops coming out, it is killing our shoulders, holding it up.
Posted by PracticalReviews on June 29 2013 | Verified Purchase
cholecalciferol is oil soluble so getting it dissolved inside olive oil is one of the best ways to get it.it is also much cheaper than gel caps and i trust this company for their quality of products,the container it easier to manage and better than healthy origins dropper... you are welcome to rate & read my other reviews
Posted by iHerb Customer on December 9 2010 | Verified Purchase
This product should be the number 1 vit D3 product, because it will last you a long time and the IU dosage is very high. Vit D is good for mood regulation, appetitie control, and boosting immunity, along with stronger bones. I use it to help combat Seasaonal Affective Disorder in the winter.
Posted by iHerb Customer on August 26 2010 | Verified Purchase
It has 33% more in volume than Carlson Labs. Great Price too.
Posted by Pauliina on January 1 2018 | Verified Purchase
Good price for a strong vitamin and easy to take. Use it for myself and my dogs.
Posted by iHerb Customer on August 15 2017 | Verified Purchase
I don't see much difference between the vit D supplements that are oil drops. I feel more energized when I take them in the gloomy fall season. I only care about taste. This one has a bit more distinct olive oil taste and flavour, and bit of olive oil sting. If that's not a big deal then it would be your good helper till it lasts.
Posted by iHerb Customer on June 1 2017 | Verified Purchase
I'm so happy I bought this item for such a good price. It helps with my energy level a lot in combination with magnesium spray.
Posted by iHerb Customer on March 16 2017 | Verified Purchase
Great product, great service.
Posted by iHerb Customer on March 9 2017 | Verified Purchase
Seems to work much better in liquid form. I'm severely low in D and have been on prescription in the past. Works well!
Posted by iHerb Customer on March 7 2017 | Verified Purchase
I use it all the time. It last longer