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I take a b-12 complex in a daily vit.... As for how it works with phen, not sure about that one. But, b-12 by itself with give you energy and it a more clean type of energy. Meaning not caffine type. You can get b-12 just about anywhere that sells vit... yes walmart, target, GNC, your doc. Your doc will give you a shot once a month that will more than likely work the best for you.
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