Well I guess I'll be the exception. I used them last year during the season.
One reason I wanted to try them is because I'm a little near sighted. Not to the point I need glasses , but because at 40 yards, the target blurs a little. I don't take a vitamin on a regular basis.

It did make a slight difference in two areas.
One, I could see a little better at longer distances. Very Slight.
Two, (and this surprised me) I could hold the pin steadier for longer shots.

Would I buy them again? Yes, probably. But I don't take a daily vitamin, if I did, I might not get them again.

Just my .02