They could have made the pills larger, to fill up the bottle. Then you wouldn't even guess there was something to complain about.

Bottles are made in standard sizes by the millions, they used whatever worked for this product, base on what others here have said.

Pills are mostly filler anyway, just to make them big enough to handle, and also to improve dosing per pill. The active ingredient is usually a very small part of the volume.

I guarantee, if it were cheaper, all things considered, to use a smaller bottle, they would have.