How do you tell if your Reta is legit?

My wife bought a vial retatruide in a powder with a vial of bac. I'm kinda pissed she didn't involve me since she essentially got it from a friend of a friend, kinda the same vibes as buying weed. The label on the bottle says "Beauty Shred rx" .

How do I figure out if it's legit and not filled with heavy metal contaminants?