- amended opinion - Re: Synthroid and OJ

[Guest guest]

katiekabob wrote:

> I believe that Tropicana is fortified with calcium citrate. All of the

studies I've seen regarding calcium and T4 absorption

> refer to calcium carbonate, but I don't know if this is because the carbonate

is a problem and citrate isn't, or because they only tested carbonate. I

suspect that calcium citrate presents less

> interference, but personally, I wouldn't want to take the chance.

I did a little digging around.

Apparently Tropicana has changed their formula and now uses calcium hydroxide

instead of calcium citrate, making it closer to calcium carbonate than citrate.

Some sources refer to them as interchangeable,

but clearly they're not identical (even though they are both basically

limestone).

I'm leery about T4 absorption and calcium citrate, and more so now of T4 and

calcium enriched Tropicana.

I really, really hope that someone more knowledgeable about this will write in

and clarify the matter. In the meantime, I would avoid all sources of calcium

within 4-5 hours of taking T4.

(not a nutritionist, not a chemist)

NYC