Synthetic M. Crystal. In Solid weight 5kg. Metham tamines come in three main forms; crystal m., base, and speed. All forms of this synthetic central nervous system stimulant are highly addictive and dangerous. The legal, prescription form of the drugs, still addictive, are stimulant drugs that are used to treat ADHD. They can also help obese patients with weight loss. MINIMUM ORDER $10,000 USD