now my question about the expiration date of N powder compared to sealed liquid seems answered. Nearly every usual psychedelic substance can be stored for months/years under the right circumstances, even LSD can hold a long time, only amphetamine salt seems to loose its effects kinda fast.
I wouldn't spend 500$ for some powder I don't know the potency or storage circumstances of, since it got banned in China it may be old, or holes in bags make the powder to have contact with air, etc. (ive read some bad stuff about SN here since if it gets in contact with air it metabolizes to another chemical. N is not the same but it may still lose important potency, imagine failing with N because it acts too weak, hello wheel chair...)
chinese mobile phone okay, but chinese drugs from some underground lab? idk^^