I've had too many cups of coffee right now, so my brain may not be up to par and I may be missing something in this picture. But I was figuring, if usp grade oil is sterile, then can you just filter the powder and the ba, bb after it's dissolved and then add the oil rather than adding the oil and filtering the whole batch?
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If you open that oil to the air, it is no longer sterile. If you syringe it out of a sealed vial then you could do it that way but then you have to rely on whoever sold you the oil as to whether or not it is really sterile.
I am not that trusting anymore. I autoclave empty vials and filter everything that goes in them. My one experience with cellulitus was not a pleasant one.

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