I'm surprised by Carlson's zinc quality. He already knew it was a well-known brand, but he had not yet had a chance to try some of his products. I took zinc over a year ago to raise my serum testosterone levels (and it works, added to vitamin D, magnesium and B6), but I was taking it from another brand and was even satisfied. But when I tried this Carlson 15 mg, I still had more positive effects of this valuable mineral: my testosterone increased (I've had more morning erections and a greater libido, which is clear evidence for me), I sleep more deeply, , I feel more focused, practically no flu. These are small, tasteless tablets. And the price is very cool. I recommend this to everyone who is seeking an ideal supplementation, but they are also avoiding the cavalry doses. Congratulations, Carlson!