B.C.
If you (collectively, not you personally) are having milk production issues, you tend to try a lot of things to help increase production so I'm not sure you'll find too many who did just one thing and can attribute success to just trying the one thing.
When I went back to work I breast fed as much as I could at home and pumped at work but no matter what I did my milk dried up at 5 months - we did formula the rest of the way till our son was about 1 yr old (he was slow to take to solids).
I tried fenugreek
I tried eating a lot of oatmeal
I tried pumping more and BF more when ever I wasn't at work.
I still dried up.
But our son didn't go hungry and had no problems on formula.