I recently took a closer look at the three recommended CLO's for the RCP (Root Cause Protocol) as well as the form available (capsules vs. liquid). I really don't think the Nordic Naturals offers enough Vitamin A to make it the best choice for an adult, it may, however, be a very good starting point for children who are learning to swallow small soft gels. The Jigsaw and Rosita brands get more Vitamin A to us in a serving.
* Some will choose one brand over the other based on taste or how it makes them feel.
* Others will be looking at where it is sourced. Jigsaw is getting their CLO from wild caught fish in Alaska. Rosita is getting their CLO from wild caught fish in Norway. Nordic Naturals is also getting their CLO from wild caught fish in Norway.
* Some will choose brand based on the total Retinol A available in a single dose - but you need to make sure that the doses are being compared in equivalents. The dose for Rosita capsules nets less Vitamin A (retinol) than the suggested dose of Rosita liquid. Even if you double the capsules taken per day or lower the liquid to 1/2 the dose, they are not equal. It would take quite a few of Nordic Naturals to come close to the recommended amount of Vitamin A from Retinol - which is approximately 900mcg, (3,000iu).
Ultimately, as always, you should try them over time and make your choice based on what you can afford and how it makes you feel.
I personally have tried all three and am not necessarily partial to any one of them. I like the convenience of capsules when I travel and I don't mind the taste of the liquid. I tend to go for the greatest health potential and bang for my buck in terms of total Vitamin A (retinol).
Regardless of which of the three above you use, read the serving size and recommended dosing carefully. The serving sizes vary from one product to another. I recommend a fatty meal or snack with your cod liver dose to aid in absorption.
The RDA for children is 4000mcg-700mcg (based on age and weight) and up to 900mcg for adults. Lactating mothers should aim for upwards of 1300mcg/day.