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Phentermine failures can occur because the appetite suppression was insufficient, because tolerance developed too quickly, or because the patient eating patterns were driven by factors other than hunger (emotional eating, habit, environment)

But if you come back every week for a month or so you'll notice a big difference in your overall level of energy." So the very first time someone gets a B12 shot they probably won't feel much of an effect, even though they might experience a bit of an energy boost after the very first one, but it usually only lasts for about a week

I hope you haven't binned them yet

At first, you might get shots several times a week