User blog comment:IamJakuhoRaikoben/Chapter 487: The Third Seal, Review./@comment-67.149.177.130-20160602004612/@comment-7418318-20160604064635

Nc, it was a good retort. MBP aren't your regular poison, but things that destroy magic. They are literally anti-magic. Put them together with magic and the two either neutralize each other or the MBP erase the magic.

Sure there was iron in the MBP (which very conveniently was revealed just in the very chapter in which it would be useful to this one specific person who tries to ingest them...) but even in this chapter it was said they contained a tiny amount of iron. So how can Gajeel power up his magic. Any power he could gain from the tiny amount of iron should be neutralized, along with a good chunk of the magic he does have in him by the anti-magic properties of the MBP.

It's like saying that heating up a block of ice will make the ice even colder.

Now if Gajeel had done something a little like in Natsu vs. Zancrow it might have worked for me. If the MBP erased all of Gajeel's own magic and he fully replaced them with solely the powers gained from the MBP okay fine. But combinding magic and anti-magic is just something that can't go together in my mind. Plus and minus can't equal plus. That's just not how it works.