Depends on the dose you want to use, tren ester and injection frequency. At 100mg/ml I am assuming you mean tren A? Dosage 300mg/wk? So 10 doses, just over 3 weeks of gear in one 10ml vial. We really need more to go on. An easy way to figure. Multiply mg/ml by ml in vial. And then divide by the dosage per week you want to have. This will give you how many weeks you'll get from one vial.
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