Originally Posted by SunLover8
For anyone interested, a great source for Vitamin D beside the Sun is cod liver oil, especially by (SPAM). From what I know it has the highest concentrations of natural Vitamin D of all cod liver oil available. They even sell a fermented version which not only enhances the Vitamin D and A but also adds Vitamin E, K and other great nutrients.
Another reason to get your Vit D the way nature intended... UV rays.
Here's one for the spammer to read. ;) This is the largest study to date showing vitamin A blocks vitamin D's effect and explains some of the anomalies in other papers on vitamin D and cancer.
Avoid cod liver oil like the poison it is and check your multivitamins. Life Extension Foundation just reformulated their multivitamin to contain only 500 IU of preformed retinol.
Source: Vitamin D Council