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    need help - making pills with Amphetamine

    I going to make pills (300mg) And It requires "fenethylline" to make it. I will use amphetamine instead of fenethylline. the question is : How much amphetamine should I use to make 1kg of pills ? As I know, I should add 300 mg of amphetamine to 1 kg of filler (Starch). But what made me...