Yes Jordan it is perfectly fine to use it, I have used it on several instances. Just make sure it is plain agar with no flavoring agents and sugar already added. You should make the liquid medium by boiling it etc. then fill it in the bottles and then add the agar powder to it and then autoclave it. Never cook your agar on a direct stove with your media. Make the media separately and then add the agar later. This is our standard practice in the lab also. After adding the agar, you do not even need to shake it, during autoclaving it will melt and become homogenous with the medium. If you shake it it will stick to the sides of the bottle and and get stuck to it after autoclaving. 2 to 3 g per 100 ml should do the trick.