A drug dealer approaches his buyer, and in exchange for $50 cash, hands over a pouch containing a vial and a single syringe.He is distributing unregulated, experimental peptides.The injectable drugs have not been approved for use in Australia, but have become widely used for weight loss, muscle growth, anti-ageing and skin improvement.Australia's medicine regulator has warned unapproved peptides can cause "serious adverse effects", including liver damage, severe allergic reactions, and inflammation.To demonstrate how easy they are to buy, the ABC coordinated the purchase as part of an investigation into dangerous, unapproved medications being sold via social media.The vial of peptides…