The product is supplied in standard laboratory grade dry chemical packaging. It was well labeled and worked well in my application (creating reference solutions to calibrate a conductivity sensor). This item is not intended for cooking and I would not recommend swallowing it. This is a lab grade product, not food grade - some other reviewers seem to have abused it. If my sample contains a toxic contaminant, using it as a sensor calibration solution won't kill me, but if you use it inappropriately in cooking, it could make a world of difference. For lab use, this worked very well.