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 February 27 2017 | Verified Purchase
My Vit D levels drop so this helps me maintain healthy level
Posted by iHerb Customer on December 4 2015 | Verified Purchase
This is very good vitamine! In nordic countrys you must use 4-5 drops, per day to feel good.
Posted by iHerb Customer on March 6 2017 | Verified Purchase
It's difficult to drip out the liquid. As for the effect, it is still too early to tell.
Posted by coconut on June 23 2012 | Verified Purchase
Simple no nonsense way to get vitamin D. Helped with vitamin D defficientcy
Posted by nattfisk on July 13 2012 | Verified Purchase
I'm so suprised that only two drops of this very neutral tasting Vitamin D supplement give you about 1000% of your daily value. That's a lot of hours outside in the sun. So, instead of increasing my chance of getting skin cancer, I take this. It's so neutral tasting, that I also give a drop to my husband every morning. Will test myself in four weeks, to see if it gets my Vitamin D levels stable. I won't give it five stars, because it's quite hard to get the drops out of the small bottle. You'll have to shake, twist and turn, and I guess it gets harder when it's less liquid in the bottle.
Posted by iHerb Customer on March 8 2018 | Verified Purchase
Posted by iHerb Customer on January 31 2018 | Verified Purchase
Posted by MayAus on December 27 2017 | Verified Purchase
Vit D levels went from undetectable <20, to consistently above 100. I am notoriously bad with remembering to take medication, so I usually take 1months worth in one go when I remember, and that has been working for me . Vit D is one of the fat soluble vitamins, and you need to take a lot, before it becomes toxic (unlike things like vitamin A which can be teratogenic at high levels)- so can do the above safely provided there are no major underlying health issues)
Posted by iHerb Customer on November 23 2017 | Verified Purchase
Perfect product if you need vit D .
Posted by iHerb Customer on November 21 2017 | Verified Purchase
I like using the product. I feel like it is helping already.