"Roughly 100 Sprays Per Bottle" And A 30-Day Supply: The Math Mismatch

The dosing table says roughly 100 sprays per bottle at 4 sprays a day, a 30-day supply.

The first problem

100 sprays divided by 4 a day is 25 days, not 30. So the sentence disagrees with itself even before the bottle size is considered.

What it likely means

It may be a slip for 100 servings, which would be a very different supply. Either way, the sentence is unreliable.