B-12 I've heard is actually better than the 5thp. I've tried neither of them because I"m not on Phen anymore, but from what I've been told B-12 is great to give it an extra boost. Seeing as how you are on Phen either though I'm not sure how it would work LOL
Do keep us posted if you decide to try the Phentramin...I'm curious about it also 
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