My milk supply has been just fine. My routine is that I pump at work, twice per day during chill days and once per day during crazy days (I work an average of 8 hours per day). I drink water to thirst and do not take any herbs to increase my supply. I have used More Milk Plus in the past, but since it's tinctured in alcohol I haven't used it during my Whole30. I've always had an abundant supply though, so it shouldn't shock me that I still make enough to feed my babe and have enough leftover to milkshare with a friend who is having lactation difficulty.
Anyhoo, I nurse as soon as I get home, then for nourishment and comfort throughout the evening and night. We bedshare and I love it. True, my babe isn't sleeping through the night, but it doesn't really bother me, keeps my milk supply up, and helps us stay close even though I'm gone every day. I roll over with him to switch sides and judging from an approximate number of roll-overs (approximate because I never fully wake up...so I'm a little hazy) he nurses an average of 3-4 times per night.
My nursling doesn't seem to mind my diet...no particular issues with gas or upset tummy. He's as chubby and happy as he could be, so I'm assuming he's properly nourished.
That's about it. Hope that helps if you're wondering if doing Whole30 affects milk supply/nursing relationship.