I've been reading up a bunch on using cod liver oil to supplement vitamin D in the winter, and I had a question about vitamin A:D ratios. The WAPF states that the ratio of Vitamin A to D in supplements should be around 5:1. Trouble is, no one's said what units that's in. Is it in IUs, RDA percentages, or metric weight?
For example, a tsp of Green Pasture's FCLO has the following stats (roughly):
Vitamin A: 9,500 IU/120% RDA (830mcg)
Vitamin D: 2,000 IU/1000% RDA (50mcg)
If we're going by IU, we have a 4.75:1 A:D ratio. If we're going by RDA, we have a 1:8.5 A/D ratio. In mcg, we have a 17:1 ratio. From this it would seem like the ratio is in IUs, but honestly this whole IU/RDA/mcg thing is confusing (for example, I've seen an UL for Vitamin A [Retinol] listed as 3,000 mcg/10,000 IU, while FCLO has 830mcg/9500 IU - huh?). If FCLO's A:D is around 5:1 I'll take a tsp and be done with it, but I want to make sure before I dive in.
asked byDan_14 (1377)
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on August 14, 2011
at 02:53 AM
I understand where you are coming from, but I'm not so sure about those ratios (5:1).
I've read both WAPF's stance and the Vitamin D Council's and it just does not make any sense to me that we would have evolved with a higher daily A to D ratio. Liver is one per animal, shared amongst the tribe--not a daily thing, either. Sunshine = 10,000 to 20,000 IUs D3/day.
Katherine has commented on this as well in some previous posts.
Personally, I go for liver once a week and 1000 IUs of D3 per 25 lbs of body weight (Vitamin D Council recs.)
on August 22, 2011
at 08:23 PM
I know Paul Jaminet of perfecthealthdiet.com wrote that the ideal ratio is 3:1 A to D. Gotta have your vitamin K as well.