Studies suggest that vitamin B6 can help in the suppression of prolactin, much like bromocriptine would. It is NOT as effective as bromo, but it does help significantly reduce prolactin levels.
I read that it is important to use Pyridoxine hydrochloride (apposed to Pyridoxal hydrochloride, which is another natural form of vitamin B6).
Doses of 200mg 3X a day for 5-7 days are effective in suppressing lactation in post-partum females.
I don’t know how long to run it as part of PCT. But it does seem like a good idea to use B6 during a tren cycle, as well as part of PCT; since prolactin will be an issue in both scenarios. B6 and all B-vitamins are water soluble, so vitamin overdose shouldn’t be an issue.