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Out of curiosity, the various brands, were any of them in liquid form?

The reason I ask is because it's possible to be intolerant or allergic to one of the filler ingredients in a tablet.

No, they weren't, and that's a good suggestion that I need to try.

Get a well-rated softgel form without iffy ingredients like caramel coloring.

I think at this point, they should just go straight to liquid with an eyedropper, no gelatin capsule or anything in order to try and rule out as much as possible.

The problem with an exposed liquid is that will definitely lose its potency a lot quicker. A softgel keeps the active ingredient somewhat protected from oxidation. It also depends on the level of antioxidant present in the liquid. This matters in the tail end of the bottle.

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