Refrigerate at 28 C, protect from light, and observe the beyond-use window
Since your body only absorbs a small amount at once, excess B12 just gets flushed out
^ Palva IP, Salokannel, SJ, Timonen T, et al: Drug induced malabsorption of vitamin B12 - IV - malabsorption and deficiency of B12 during treatment with slow-release potassium chloride, Acta Med Scand, 1972, 191(4):355-7 [edit] External links Vitamin B12 deficiency details, symptoms and information Jane Higdon, "Vitamin B12", Micronutrient Information Center, Linus Pauling Institute Vitamin B12
The timing of these breakouts can help you identify a possible cause