Vitamins while breastfeeding

I saw this post about postpartum body recovery which includes taking Vitamin B Complex. So I started taking it, but I soon noticed my breastmilk (exclusively pumping) has a very faint greenish tint. (Also my pee is very bright, sort of a green tint too).

I'm just wondering if anyone knows much about this vitamin and if it's actually safe while breastfeeding. Baby has still been drinking it like normal and doesn't seem affected so far. Just has me hesitant on continuing.