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The benzyl alcohol preservative in Bacteriostatic Water does not interact with the BSA carrier at 0.9% concentration , the combined Bacteriostatic Water plus 0.1% BSA reconstitution vehicle provides both bacteriostatic preservation and carrier protein stabilisation for multi-use recombinant protein research vials

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Vitamin B-12 is found naturally in certain foods such as meat, fish, eggs, milk, and some fortified cereals

Afr J Tradit Complement Altern Med, 2011

Brain Res 1109 : 201206

One more detail that researchers often overlook: every time you puncture the rubber stopper with a needle, you create a tiny pathway for contamination