Is it true that all UG powders are just 50% pure at best?

[master.on]

Even if bought right at the chinese factory (back) door?
Some say they skip some purification steps on UG powder to cut costs.
Unlike pricey pharma grade powders meant for legal labs.

Impurities may explain why UG powder tends to crash more.

 

[Jakan]

Pharma products they are in concentrrations where is no reason to crush. I dont thing that UG powders have tends to crash more.