Sodium Caseinate is a milk protein!
I would treat it at least as DE ( dairy equipment ) if not Dairy. This is up to your Rabbi to decide.
Related Milk Questions
- Is Coffee Mate or Milk Alternatives Kosher?
- Is Milka by KRAFT Kosher?
- Milk in Canada
- Does Parmalat Milk Kosher, what about Parmalat Chocolate?