[Isabelle]

Hi lled,

I don't expect a real problem with prolactin, because lactating women are advised to double their vitamin B6 intake:
http://en.wikipedia.org/wiki/Vitamin_B6
But that's 2 mg a day. The upper limit is 100 mg. I have a multivitamin that says on the label it can cause slight tingles and sedation after prolonged use, because it contains more than 10 mg vitamin B6.
The doses needed to reduce prolactin are huge, 200-600 mg/day:
http://jcem.endojournals.org/content/42/6/1192.short

I don't think you are getting too much vitamin B6. It's in things I wouldn't expect to find in your diet, like potatoes and bananas. The NBE herb for vitamin B6 is oats:
http://ods.od.nih.gov/factsheets/vitaminb6

Don't worry about the vitamin B6 in spearmint: 1 tsp of dried spearmint contains only 13 micrograms:
http://www.wolframalpha.com/input/?i=dried+spearmint+vitamin+B6&lk=1

Then just how much vitamin B6 should you be getting for NBE? NBE advice just quotes the recommended dietary allowance (RDA) for lactating women, 2 mg a day:
http://bestbreastcancer.info/uncategoriz...-vitamins/
http://breast-tips.com/2011/07/07/breast...-vitamins/
I still think it's strange the upper limit is 50 times higher than the RDA. If you're worried you're getting too much, check side effects and symptoms of vitamin B6 toxicity:
http://women.emedtv.com/vitamin-b6/vitam...fects.html