Has anyone noticed that a bottle of Novelin N gets weaker as time goes by. By the time I have used 2/3 of a bottle in about 2 weeks I find I need more units to work as well as the amount I needed in week one. The bottles are not old and are kept in a cool place after I open a new bottle. I gently rotate the bottle each time as instructed to mix the solution. I have been noticing this for quite a while. Has this happened to you?
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