I'm always worried that the dose on the bottle is not the does I'm really getting, since supplements aren't well regulated. 1000 IU is only 25 micrograms, so it

I'm always worried that the dose on the bottle is not the does I'm really getting, since supplements aren't well regulated. 1000 IU is only 25 micrograms, so it would be really easy for them put in 100,000 IU instead.