When I found out recently of some health problems I had, blood work performed in the process showed that my Vitamin D levels were low. My doctor recommended that I start taking a Vitamin D supplement on a daily basis and he would repeat the blood work 30 days after. So I went online searching for the best Vitamin D supplement that wouldn't taste yucky and cause nausea and upset stomach. I have a problem taking most vitamin supplements because they just don't digest well in my system. After reading many reviews I bought Nature's Bounty Spring Valley Vitamin D 1000 IU. It was reasonably priced and had great reviews. These vitamins were very easy to swallow, didn't make me nauseated and did the job. I had blood work performed approximately 30 after starting this supplement and my Vitamin D levels were back to normal. So I'm satisfied with this product and recommend it because it's a great product that actually works.