Does anyone know of any product that actually helps skin tone?

Stubborn dark circles may indicate a hormone problem. And there is something you can take to make age spots (or sun spots) disappear, it’s called a skin whitener. Probably would help with freckles too. All those have to be processed by the liver. It is a fairly high dose of glutathione. Supposed to help with acne scars too.

Try retinols. Like retin A.
I have acne marks, not age spots, but glycolic acid and hyaluronic acid have been helping me.