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It is normal for the solution to darken slightly over time under refrigeration, particularly due to the riboflavin content
Some people notice the energy boost from B12 injections within a few hours
How and where do I administer the injection
Riboflavin (vitamin B) is light-sensitive and can degrade with exposure to sunlight or strong UV light, which may reduce the vitamin content and cause the solution to darken
Some people experience temporary diarrhea
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