chemical grades

https://en.wikipedia.org/wiki/Chemical_purity

Chemical grades that are safe for humans to ingest (as food, medicine, or drugs):

• ACS grade (American Chemical Society)
• USP grade (United States Pharmacopeia)
• NF grade (National Formulary)
• British Pharmacopoeia
• Japanese Pharmacopeia

Chemical grades that are not safe for humans to ingest:

• Reagent grade
• Laboratory grade
• Purified grade
• Technical grade