This is the only brand I will buy:
Country Life Vitamin D3 -- 5000 IU - 200 Softgels - Vitacost
Other Ingredients: Medium chain triglycerides, [gelatin, glycerin, purified water (capsule shell)]
It's packed in MCT's. That's it. No soybean oil, which most fat soluble vitamins are packed in. Also, 200 5000IU softgels for $7.99? This is a no-brainer.
However, 5,000IU's is a ton of isolated vitamins. I wouldn't take it more than 1-2 times a week. There's something to be said about taking large amounts of a refined, isolated fat-soluble vitamin...it just screams "toxicity" to me. If you take it, take it in the AM (not before bed, you make vitamin D during the day, not during the night!), take it less in the winter than the summer, etc. Be smart with it, just don't pop pills.