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 November 22 2009 | Verified Purchase
best form of vitamin D because you avoid the toxic gelatin in the gells ones!! thanks iherb for carrying this product!
Posted by iHerb Customer on September 10 2014 | Verified Purchase
This is a very economical way to get your vitamin D. the bottle lasts a long time and the vitamin has proven itself as very effective in raising the level in the last blood test. Also it is kosher which I appreciate.
Posted by iHerb Customer on May 8 2010 | Verified Purchase
I'm one who finds taking pills (of any kind) detestable, especially with all the good supplements on the market these days. I chose this product for two reasons: no pill to take is the first and the second is that it comes in a 4,000 IU dosage. I will order this again.
Posted by iHerb Customer on January 30 2010 | Verified Purchase
Love this product, easy to take, doesn't taste horrible if you don't mind a few drops of oil on your tongue. Has also given me the energy I've been lacking.
Posted by iHerb Customer on January 10 2017 | Verified Purchase
I have been using Nature's Answers Vitamin D3 supplement for almost 2 years. It is a very good quality product, the recent lab test just confirmed that. Prior to use this particular drops I was always low on Vitamin D3 tests. My family doctor was surprised to see the numbers within the recommended range this year. Vitamin D3 is very important supplement for our well being. As per packaging you have to be patient as the drops are coming very slow at the very beginning. I sometimes have to lean the bottle a bit or tap slightly for the drops start coming out of the bottle. Love this Nature's Answer Vitamin D3 drops.
Posted by iHerb Customer on February 26 2015 | Verified Purchase
This product is so easy to use and doesn't require much effort. Just three drops provide 4000 IUs of Vitamin D-3. Who could ask for anything better? The taste is pleasant and the value can't be beat. Thanks iHerb, you've won me over again.
Posted by iHerb Customer on August 19 2014 | Verified Purchase
I've used this for years to correct a deficiency, then maintain levels. It has been very effective.
Posted by iHerb Customer on November 13 2013 | Verified Purchase
The quality of the product is excellent and has enabled my blood levels to stabilise quite quickly.
Posted by Herbhild on June 23 2012 | Verified Purchase
D-vitaminer maa vi ha om vinteren. Desse er i dropeform og smaker ingenting. Bland i smothien!
Posted by iHerb Customer on November 4 2010 | Verified Purchase
Used it in 10000-12000 IU to get my wife's D levels up during pregnancy. After 2 months here levels went from 25 to 78, so this stuff works. We now both supplement daily with two drops, 4000 IU for optimal daily health.