Check the register yourself rather than trusting the number printed on the site.

Half of what people describe as tolerance is a change in the underlying condition, and the two need different answers.

Check the register yourself rather than trusting the number printed on the site. Not on US state licensing but the pattern is familiar.

Is a baseline blood test really necessary before starting something like this?

You have two changes at once here. You cannot attribute anything until one of them moves. Currently on a thing you bought myself.