I chose to take cod liver oil, which contains 400 IU per teaspoon. I had been taking a couple of teaspoons once in awhile, but after the m/c and reading the research, I decide to increase my intake to 4 measured teaspoons per day, or 1600 IU of Vitamin D.Ideally, I would have had a doctor to monitor me, but I didn't have that option.To help put it in perspective, it's interesting to know that our bodies make at least 10,000 IU of Vitamin D with full body exposure in sunshine for 30 mins. The problem is, most of us get very little sun anymore.I like Carlson lemon-flavored cod liver oil because it is fresh, free of contaminants, and contains not only Vitamin D, but also Vitamin A, Omega-3 fatty acids, and some Vitamin E. For more info on Vitamin D, please see
http://www.vitamindcouncil.com There is a lot of information there regarding Vitamin D deficiency, various diseases, different forms, toxicity, etc.Cholecalciferol is the more natural form of Vitamin D. Ergocalciferol is sometimes used in multi-vitamins, but may not be as safe as cholecalciferol.I've read that cholecalciferol is available in pill form, too. So that may be preferable to some people.