Injectable Glutathione Recipe

sorry to hijack. I made 20ml of L-Carnitine 500mg/ml a few months ago with no problems. crystal clear and zero pip. i used distilled water and ba. ph strip showed it was at 7. I ran out and decided to make 60ml's. this one is also crystal clear. but, ph is showing its 9 somehow. it has a bite to it. how do you go about lowering the ph? sodium bicarbonate usp? if so, how do you know how much to add?
 
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