I am not sure it does have 1.2g of elemental calcium. This would make each capsule about 2.5g there being two capsules for a serving.
If you have some you can weigh say 10 capsules and see what they are. Domestic weighing machines tend not to be that accurate for light things.
I have some of the non-slow-release kind, and can say they are big, thick, heavy pills. I could even imagine someone choking on one. I stopped taking them a year or so ago just because I decided that amount of calcium in my diet is probably excessive.
I forgot to say that a “dose” is 2 pills.
In which case you are right that could be substantially calcium citrate tetrahydrate. One reason I went to a chemical broker for my citrates was to get certainty as to what I was buying.
@John_Hemming, I took the following today to see if it would help with GERD. This with my morning coffee and no food until lunch.
Felt high until early afternoon. Colors were brighter; felt separated from my body, as though observing it; and had a pleasant relaxed feeling. A mouth ulcer from rapamycin felt more painful. Then I crashed and took a 1.5 hour nap and feel more or less back to baseline.
Any ideas what that was?
Not really.
I take a lot more, but I also include potassium.