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CoolTweetPete said:post 112744 Curious why. I (and many others on this forum) take Haidut's Retinil, which I believe is retinyl acetate.
Wilfrid puts it nicely in his post above. Here's also some RP quotes in this regard:
Yes, vitamin A and estrogen are antagonistic, and while estrogen promotes keratinization (shedding of skin cells), vitamin A opposes it. Since vitamin A is highly unsaturated, in excess it suppresses the thyroid, so it has to be balanced with the thyroid; the combination is effective for increasing progesterone and decreasing estrogen, slowing the turnover of skin cells, and making the skin cells function longer before flaking off. Plugged pores, combined with a local shift toward synthesizing inflammatory substances, foster bacterial infection. Bright light stimulates the production of steroids, and consumes vitamin A very quickly, but when the balance is right, the acne clears up in just a day or two. Cream, butter, eggs, and liver are good sources of vitamin A. When people supplement thyroid and eat liver once or twice a week, their acne and dandruff (and many other problems) usually clear up very quickly. It was acne and dandruff that led me into studying the steroids and thyroid, and in the process I found that they were related to constipation and food sensitivity.
"For several years, I had a similar need to take 100,000 i.u. daily to prevent acne and ingrown whiskers, so I read a lot about its effects. The toxic effects of extremely big doses, such as 500,000 to a million i.u., seem to be from either oxidative processes (rancidity) that are prevented by adequate vitamin E, or by antithyroid effects. I found that when my need for vitamin A began to decrease I tended to accumulate carotene in my calluses; that happens when the thyroid function is lower, reducing the need for vitamin A. Since you are eating foods with carotene, the calluses on your palms or soles should serve as an indicator of when your tissues are saturated with vitamin A. About 100 i.u. of vitamin E would help to keep the vitamin A from being wasted by oxidation, and possibly could reduce your requirement for it."
Wilfrid said:post 112754 Hi Such,
The idea is interesting but as usual when it comes to synthetic vitamins/minerals supplements the interrelationship between those are likely to be problematic.
Vitamin A ( as a supp ) is very unstable and easily oxidized; its oxidation being, among other things, catalyzed by trace metals, notably iron and copper.
Which means that's the amount of vitamin A will quicly deteriorate and can't be counted on.
Too much cobalt can sometimes be problematic for hypothyroid people.
Selenium contains sulfur... and sulfur and cobalt can also interact. In fact, B12 in supplement often react with thiamine ( a sulfur containing vitamin ) and copper to form inactive B12 analogue. And so on....
Very insightful Wilfrid.
Do you know exactly why Zinc supplements might be problematic.
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