There is a brand of creatine manufactured in the US (con-cret) and a brand manufactured in Germany (Creapure). Either of those companies should address the concern around adulterated powder.

> That's why I dropped creatine since I didn't notice any benefits when I tried it for a year.

Some percentage of people (~20%) are creatine non-responders [1]. It's pretty reasonable to try creatine and then drop it if you find no benefit. I personally find the gain very marginal.

[1] https://fitchef.com/shorts/creatine-non-responder/