3% thioglycollate - expiration

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SeanBeatty
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3% thioglycollate - expiration

 Hi, 
I'm looking to do some cell recruitment using intraperitoneal injection of 3% thioglycollate. From everything that I have read, older solution is better. I have access to a solution that is 5 years old. Does the solution expire? Is 5 years too old?
 
Thanks, 

Sean