Breastfeeding and vitamin supplements?

Not sure if this is a problem as much as a query

I take a MegaB supplement as I have a B12 deficiency. Whichever brand I take (TMI) my pee always goes a Fluro yellow/green after which I know is normal. This morning I expressed and for the first time my milk is also tinged green! I have changed to a more bio available brand of supplement and don't often express in the mornings ( which is when I take the supplement)

So my question is has anyone else had experience with vitamins altering the clour of your breast milk? I'm still going to give it to my dd as I figure she has been having it all week with no problems. Hopefully I can convince my MIL that the green milk is ok to give dd while I get my hair done tomorrow!